Category Archives: Animal Behavior

Oxytocin and Childbirth. Or not.

Blogging on Peer-Reviewed Research

When teaching human or animal physiology, it is very easy to come up with examples of ubiqutous negative feedback loops. On the other hand, there are very few physiological processes that can serve as examples of positive feedback. These include opening of the ion channels during the action potential, the blood clotting cascade, emptying of the urinary bladder, copulation, breastfeeding and childbirth. The last two (and perhaps the last three!) involve the hormone oxytocin. The childbirth, at least in humans, is a canonical example and the standard story goes roughly like this:

When the baby is ready to go out (and there’s no stopping it at this point!), it releases a hormone that triggers the first contraction of the uterus. The contraction of the uterus pushes the baby out a little. That movement of the baby stretches the wall of the uterus. The wall of the uterus contains stretch receptors which send signals to the brain. In response to the signal, the brain (actually the posterior portion of the pituitary gland, which is an outgrowth of the brain) releases hormone oxytocin. Oxytocin gets into the bloodstream and reaches the uterus triggering the next contraction which, in turn, moves the baby which further stretches the wall of the uterus, which results in more release of oxytocin…and so on, until the baby is expelled, when everything returns to normal.

As usual, introductory textbook material lags by a few years (or decades) behind the current state of scientific understanding. And a brand new paper just added a new monkeywrench into the story. Oxytocin in the Circadian Timing of Birth by Jeffrey Roizen, Christina E. Luedke, Erik D. Herzog and Louis J. Muglia was published last Tuesday night and I have been poring over it since then. It is a very short paper, yet there is so much there to think about! Oh, and of course I was going to comment on a paper by Erik Herzog – you knew that was coming! Not just that he is my friend, but he also tends to ask all the questions I consider interesting in my field, including questions I wanted to answer myself while I was still in the lab (so I live vicariously though his papers and blog about every one of them).
Unfortunately, I have not found time yet to write a Clock Tutorial on the fascinating topic of embryonic development of the circadian system in mammals and the transfer of circadian time from mother to fetus – a link to it would have worked wonderfully here – so I’ll have to make shortcuts, but I hope that the gist of the paper will be clear anyway.

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Cool Animal Meme

This was Anton’s idea, at the dinner the other night, but I will get it started here anyway.
An interesting animal I had
I never owned an unusual species of animal. As a little kid I had small turtle named Aeschillus. Later I had two horses, half-brothers, whose names meant the same in two different languages – Meraklija in Serbian and Kefli in Hebrew both mean “one who truly enjoys life and good things in life”. My wife was a better namer of horses – her last one, the one she brought into the marriage, she named Double Helix and his barn nickname was Watson. A cat and a dog also became “mine” through marriage. We had a Love Bird briefly, and some tetras, a couple of great dogs and, of course, the three cats that sometimes grace the pages of this blog: Biscuit, Marbles and Orange Julius. Probably the most interesting animal I had, but could not really claim full ownership of (it was probably owned by someone, but was considered to be communal) was a skewbald Cameroon Pigmy Goat that served as a stall-mate to Meraklija as he was a highly strung Thoroughbred who needed company to calm him down. There were several goats in the barn, each living where needed, no matter who owned the horse in question. One of the goats was not a pigmy, but a normal-sized white goat who had to be milked every dawn and dusk by whoever was feeding the horses that day. So, on Thurdsays – my feeding day – I got to milk the goat and keep the milk for my own consumption if I wanted to.
An interesting animal I ate
Everyone has tried a taste of their lab animal at least once, so yes, I had eaten marinated and fried breasts of Japanese quail once. Delicious! Also, whenever we gelded a colt, I’d take the ‘prize’ home, marinate for a day or two, then everyone from the barn would come over to one of our houses for some great fried horse whitebreads.
An interesting animal in the Museum
George – the ancient python at the Museum of Life Science in Raleigh was everyone’s favourite for many years. Seeing a stuffed dodo is always an emotional moment.
An interesting thing I did with or to an animal
Sure, I did some stuff to my lab animals, e.g, surgeries. That is not such a big deal. More interestingly, I once participated in the Christmas slaughter of three pigs at the farm where I kept my younger horse. It is hard work and makes you really appreciate your food afterwards.
An interesting animal in its natural habitat
Bumping into a snake is always exciting. Deer, possums, raccoons, rabbits, turkey vultures and red-tailed hawks are common around here and not that exciting to see. I once saw an octopus that came too close to the coast, minutes before it was harpooned by the owner of a local seafood restaurant for dinner. Standing in the dark in Florida at the beach and watching a whooperwill on a perch from just a few feet away for almost half an hour was quite a thrill.
OK, let’s get this started. I am tagging:
Anton
Anna
Brian
Anne-Marie
Danica
Chris
Craig
Jeremy
Eric
Update: Responses are coming in fast!
Ted adds another great question: “a favorite literary animal” – mine is Charlotte (no, not Wilbur) from Charlotte’s Web. And most recently Hemi the Mule.
Here are Chris Clarke (and Tigtog who was tagged by Chris) and Brian Switek (aka Laelaps), the fastest out of the gate. Very cool stories – I’ll try to track it into the future, the tagged and the taggees, as much as I can. Oh, I did not know that Kate also rides horses and she also has a question for Spanish-speaking naturalists. And definitely check out the responses by Theriomorph and Julia Heathcote.
Both Eric and his daughter answered in parallel. Oh, I knew Anne-Marie was going to show off some cool animals she encountered in the field!
Jeremy Bruno comes through. And then, there are cool entries by John Dennehy,
Zach Miller and Dita.
Chris Taylor has seen it all. Nanette is not an adventurous eater. Rana insightful as always. Sherwood Harrington is hillarious. Also check responses by Dr. Violet Socks, Timothy Shortell and Flash.
Neil of Microecos divided each question into vertebrate and invertebrate section which is very cool. Also read Helen, Bernice and Foilwoman.
PZ Myers is waxing poetic..and erotic…about fish!
Update 2: Steve put the announcement up on the latest Friday Ark, so now everyone is tagged!
Check out the latest additions:
Will Bairs
Ed Yong
Fresh Brainz
Self-designed Student
Jessica
Jennifer Forman Orth
Dan Rhoads
Mary Ann
Meta and Meta
The Lizard Queen

Last paper by Steve Irwin!

Just published about an hour ago (if it was in hardcopy, it would still be hot off the presses). And it is a wonderful paper! Australian crocs can and will travel much longer distances than was previously thought and their homing instinct is strong and navigational capacity excellent, even in a case where a large obstacle (Cape York Peninsula) needed to be navigated around:
Satellite Tracking Reveals Long Distance Coastal Travel and Homing by Translocated Estuarine Crocodiles, Crocodylus porosus:

Crocodiles are widely distributed and can usually be found in remote areas, however very little is known about their movements on a larger scale. In this study, Read and colleagues (including the late Steve Irwin) use satellite tracking to report the movements of three large male crocodiles, which were relocated up to 411km from their capture sites in Northern Australia. The results show that each crocodile returned to its original capture site within days, indicating that homing abilities are present amongst crocodiles.

croc.jpg
Can you imagine anyone doing this work without Steve Irwin? Who else would be able to grab a big croc, attach a satellite tracker, load it and unload it some hundreds of miles away, then follow their movements on the computer screen? Would you dare ask your grad students to do that?

Rethinking FOXP2

Earlier studies have indicated that a gene called FOXP2, possibly involved in brain development, is extremely conserved in vertebrates, except for two notable mutations in humans. This finding suggested that this gene may in some way be involved in the evolution of language, and was thus dubbed by the popular press “the language gene”. See, for instance, this and this for some recent research on the geographic variation of this gene (and related genes) and its relation to types of languages humans use (e.g., tonal vs. non-tonal). Furthermore, a mutation in this gene in humans results in inability to form grammatically correct sentences.
This week, a new study shows that this gene is highly diverse in one group of mammals – the bats:

A new study, undertaken by a joint of team of British and Chinese scientists, has found that this gene shows unparalleled variation in echolocating bats. The results, appearing in a study published in the online, open-access journal PLoS ONE on September 19, report that FOXP2 sequence differences among bat lineages correspond well to contrasting forms of echolocation.

As Anne-Marie notes, this puts a monkey-wrench in the idea that FOXP2 is exclusively involved in language, but may be involved in vocalizations in general:

Said gene might have a new function (sensorimotor) besides the one originally attributed to it (verbal language).

Jonah Lehrer notes that the same mutation that in humans eliminates ability to use or comprehend correct grammar is also found in songbirds and the gene is expressed at high levels during the periods of intense song-learning. The story is obviously getting very interesting – does this gene have something to do with vocalizations? Or with communication? Or something totally third?
Looking forward to further responses by other blogs, hopefully Afarensis, John Hawks and Language Log?
The article on FOXP2 in bats was published yesterday on PLoS ONE so you can access it for free, read, download, use, reuse, rate, annotate and comment on.
Update: Mark Liberman explains more (and takes me to task for a mistake I made in haste last night) in this post on Language Log.
Update 2: John Hawks explains.

New on….

Too busy with the pseudo-moving right now, so just a quick set of links to other people’s good stuff:
An amazing, fantastic post on Laelaps about horse evolution (also noted by Larry Moran). While at first glance, this post on Pondering Pikaia on naturally occurring hybrids in fish is not related, I beg to differ – she does mention other instances of hybridism in nature, including those in Equids – the well-known mules and hinnies, and not so well-known zebroids and others. And I just finished reading a book Hemi: A Mule, which, IMHO, compares quite favorably to Black Beauty – after all, it was written in early 1970s USA (instead of in Victorian England) and is quite blunt on a number of topics, including sex and war. And the overall message is much more pleasing to me…but you’ll have to read it yourself.
Kate looks at a new study in Animal Behavior about the trade-offs between social/affiliative behaviors (e.g., embracing, grooming) and access to infants in New vs. Old World monkeys.
Archy looks at a new technique developed to read the old books and manuscripts without the need to open them.
There is an ongoing series of posts about the science museums and how much they have gone downhill in recent years, starting with Doctor Vector who is angry (and there is a great comment section there to read). Brian Switek responds.
The ethnobiology of voodoo zombification on Neurophilosophy.
RPM caught some wheel bugs in flagrante delicto…
T. Ryan Gregory, Larry Moran, Anne-Marie and PZ Myers discuss the so-called C-Value and why it has been thrown onto the trash-heap of history a long time ago.
Quixote on trained rats (sniffing explosives and such stuff).
Action!
Bring back the Office of Technology Assessment!
Blog Action Day 2007 focuses on the environment this year.
Restore habeas corpus.
Help make NIH-funded research findings freely available to everyone.
Stop the Centers for Medicare and Medicaid Services (CMS) from cutting reimbursements for two radioimmunotherapy drugs to less than their cost.

A kick-ass Conference: Autonomy, Singularity, Creativity

Unfortunately, due to the Murphy’s Law of conference dates, I will have to miss this fantastic meeting, because I will at the time be at another fantastic meeting, but if you can come, please do – registration will be open online in a few days.

Autonomy, Singularity, Creativity

The conference theme is about bringing scientists and humanities scholars to talk about ways that science is changing human life.

November 8th, 9th, and 10th, the National Humanities Center will host the second ASC conference.

And the program features a Who’s Who list:

Thursday, November 8th
Frans de Waal
Martha Nussbaum
Friday, November 9th
Dan Batson
Margaret Boden
Joseph Carroll
Frans de Waal
Evelyn Fox Keller
David Krakauer
William Lycan
Martha Nussbaum
Steven Pinker
Paul Rabinow
Margery Safir
Robert Sapolsky
Saturday, November 10th
Terrence Deacon
Daniel Dennett
Alex Rosenberg
Mark Turner

Of those, I have seen Sapolsky, Fox Keller and Deacon speak before, and I know Alex Rosenberg, and for each one of them alone, it is worth showing up!

Who says herbivores are timid and helpless?

Two recent examples of successful and aggressive defense against carnivores – the first one was everywhere, but I watched it first on Stranger Fruit (African buffaloes chasing away the lions – with a crocodile playing a supporting role) and the second one just got posted on Anterior Commissure (wildebeest mother chasing away African wild dogs). What great examples of strong parental behaviors – worth your time watching both videos in their entirety:

A birth of a giraffe

At the Cheyenne Mountain Zoo (CO), they filmed the birth:

Alex (1976 – 2007)

Alex.jpgIt is not unusal to write an obituary when a great scientist passes away. It is much more unusual to do so when a lab animal does so. But when that animal is not just an experimental subject, but also a friend, colleague, teacher and collaborator, than the species boundaries lose importance. And Alex, the famous African Grey Parrot, was just that, and more, to Irene Pepperberg and to the entire field of cognitive ethology. He died yesterday, unexpectedly, at the age of 31 (about half the normal life expectancy for the species) and he will be sorely missed. You can send donations, that will assure the research goes on with Alex’s younger buddies Griffin and Wart, to the Alex Foundation.

The Generation Effect in Drosophila

Bjoern Brembs placed his latest manuscript about the generation effect in fruitflies on Nature Precedings before resubmitting it to PLoS Biology. He is seeking feedback to make the manuscript better. So, if you think you can, go and try to help him out.

The Joys of Blogging Biology

One cool thing about being a blogging biologist is that one can write every day about sex with a straight face and then blame readers for “having a dirty mind”. But sex is so interesting – life would cease to exist without it and it is a central question in biology, so we have a license, nay, duty, to write about it all the time. We get all blase about it, I guess, compared to “normal people”. 😉
One cool story that revolves around sex is making the rounds of the science blogosphere today. Jake Young explains in seemingly dry scientific language:

This issue has spawned a variety of weird behaviors and adaptations. For example, the males have spines on their intromittent organs (read: insect penises) that puncture the females insides. This is to discourage them from mating with other males. In response the females kick the males during mating to limit the damage done by the spines.
——————-snip—————-
The nuptial gift in part makes up for the reproductive cost of mating to the females, which is high in this case, but Edvardsson argues that this is probably not how it evolved. Instead, the large ejaculate probably evolved first so that the male would have more sperm to compete with other males. Then, the female evolved a way to utilize the water and nutrients in that already present sperm. “Well, hey…it’s here.”

Mo the Neurophilosopher adds the scary pictures while retaining the dry scientific tone:

A cost/benefit analysis is therefore essential to the mating behaviour of the female. The number of mating events must be strictly limited because of the resulting harm. But at the same time, the female’s needs for both sperm and water must be met.

The beauty of Pondering Pikaia is her ability to cut through all the complexity and say it like it is:

basically, females will trade sex for drinks
—–snip—–
possibly the most brutal looking sex organ I have ever seen.

So, go ahead and chuckle, you readers with dirty minds, but this is a really cool evolutionary story and if titillation brings in lay readers and gets them interested in the theory behind the scientific finding all the better. This is a good example of framing, isn’t it? Got your attention and got you interested in the underlying science, didn’t it?
Update: I see that Kate also joined the fray:

And no, he doesn’t believe that these findings generalize to other species. Including humans. So, if you’re planning to proposition a female beetle anytime soon, remember to bring along a bottle of water. You should be just fine.

Evolution of Adoption

If we are not there at the moment of birth, how come we can bond with the baby and be good fathers or good adoptive parents? Kate explains. Obligatory Reading of the Day.
Update: Related is this new article by former Scibling David Dobbs: The Hormone That Helps You Read Minds
Update 2: Matt responds to Kate’s post.
Update 3: Kate wrote a follow-up: Why help out? The life of an alloparent

“Free Will” on display on SciVee

Do you remember all the buzz about the paper on the not random but not deterministic either behavior in fruitflies? By our blogfriend Bjoern Brembs?
Well, you can now watch the behavior of the insect in the movie associated with the paper. The video is up on SciVee of course – see it here.
And if there is a text box on top of it that bothers you, you can easily toggle it off – see the menu on the left, find Selection and click on the selection you are watching – textbox is gone. Click again, box is back. Also there on the left are Options, one of which includes “disable selection box”, so you should be OK.

Some birds clean hippos, some birds clean trees

The textbook example of commensalism was always the interaction between trees and the birds who make nests in those trees – it was always assumed that the birds gain from this relationships, while the trees are not in any way affected by it.
Now, a new study came out, demonstrating (for the first time, as far as I know – is that correct?), that the relationship between at least some trees and some birds is actually mutualism, i.e., both partners profit from the relationship:

Chickadees, nuthatches and warblers foraging their way through forests have been shown to spur the growth of pine trees in the West by as much as one-third, according to a new University of Colorado at Boulder study.
The study showed birds removed various species of beetles, caterpillars, ants and aphids from tree branches, increasing the vigor of the trees, said study author Kailen Mooney. Mooney, who conducted the study as part of his doctoral research in CU-Boulder’s ecology and evolutionary biology department, said it is the first study to demonstrate that birds can affect the growth of conifers.
“In a nutshell, the study shows that the presence of these birds in pine forests increased the growth of the trees by helping to rid them of damaging insects,” said Mooney. “From the standpoint of the trees, it appears that the old adage, ‘the enemy of my enemy is my friend,’ holds true.”

Hat-tip: Pondering Pikaia.

Who are you to judge what is good parenting?

There is a new study this week about an unusual reproductive strategy in a bird, the Penduline Tit, which, if anthropomorphized, would appear to be an example of some really bad, deceptive parenting. But, Anne-Marie and Kate demonstrate the proper way to think about this. Obligatory Readings of the Day.

Neuroethology in Vancouver

Bjoern Brembs is at the ICN meeting and is blogging about the talks he saw. If I went, I would have probably attended a completely different set of talks, e.g., on birdsong, memory in food-caching birds, aggression in crustaceans, strange sensory systems, spatial orientation and animal cognition, but I am certainly glad that Bjoern has highlighted the best of what he saw there:
Robert de Ruyter van Steveninck: Velocity estimation and natural visual input signals
Martin Egelhaaf: Active vision: a strategy of complexity reduction in behavioral control
Roy Ritzmann: Movement through complex terrains by insects and robots
Jack Gray: Complex behavior from compact systems
Leslie Griffith: Sex and the single fly: Pheromone-mediated learning
Sarah Dunlop: Recovery of function after CNS and PNS injury
Leslie Vosshall: Molecular neuroethology of olfaction in Drosophila
Claude Desplan: The color vision circuitry in Drosophila
Jan Ramirez: The neuronal basis of inspiration
Piali Sengupta: Running hot and cold: Thermosensory behaviors in C. elegans

Influence of Light Cycle on Dominance Status and Aggression in Crayfish

Influence of Light Cycle on Dominance Status and Aggression in CrayfishIn this post from April 06, 2006, I present some unpublished data that you may find interesting.

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A tourist in San Francisco – sea lions

Sea lions are a big draw at Pier 39. I have seen them in zoos many times, but this is the first time I see them in their normal geographical setting, as ‘un-natural’ it may seem. Unfortunately, only a dozen or so young, non-breeders are here right now. The mature adults are at their breeding grounds, further south, and will be back in August, just after I leave. Still, these were interesting to observe for a while:

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Infrasonic Communication in Elephants – a new study

Russ reports on a new study of elephant communication via vibrations transmitted through the ground. It was documented before that elephants could detect these. It was also documented that they could send out infrasonic rumbles which travel faster and farther through the ground than through air. But this is the first study I know of in which there may be hints that this is really a mode of communication between elephants:

For the study, she used recordings of two calls that had been made to warn of hunting lions. One was taped at Etosha, the other in faraway Kenya. They were played at the water hole at different times, using the ButtKicker to convey just the vibrations, stripped of the airborne sound.
“After the first experiment, I could see it was having an effect,” she said, “but it took a long time to repeat it and get statistical evidence.” With a local call, “the first thing they do is freeze; then they bunch up in the family unit, putting babies in the middle.” Before long, the entire group would leave the water hole.
The Kenyan call had a less visible effect. Some elephants froze, but they did not bunch up or quickly leave the water hole.
Colleen Kinzley, the Oakland Zoo’s curator and O’Connell-Rodwell’s graduate student on the project, suggested that the local alarm might seem more real to the elephants, whereas the one from Kenya was akin to a foreign language.

Biomonitoring?

By The Associated Press
HEMLOCK, Mich. — A woman who hates spiders is crediting them with helping save her from a house fire. Danielle Vigue, 18, says she awoke early Tuesday to find spiders in her room, and started killing them. When more showed up, she says she went across the hall and got into bed with her 15-year-old sister, Lauren.
“At first there were five, they were all around the light fixture,” Danielle Vigue told The Saginaw News. “I hate spiders, they freak me out.”
A fire, the newspaper said, apparently was smoldering in the attic of the home about 90 miles northwest of Detroit.
A few hours later, Vigue’s 48-year-old mother, Debra, and 8-year-old sister, Shelby, smelled smoke, and flames greeted the family when they opened the door to the room Danielle Vigue had earlier left.
“I will never kill another spider again,” she told WNEM-TV in Saginaw.
Richland Township Fire Chief Gary Wade, a 30-year veteran of the Saginaw County department, was surprised by Vigue’s story.
“I’ve never heard of spiders saving someone from a fire before,” Wade said.

Phylogeny vs. Aerodynamics in birds

A very interesting new paper was published today in PLoS Biology:
Flight Speeds among Bird Species: Allometric and Phylogenetic Effects by Thomas Alerstam, Mikael Rosen, Johan Backman, Per G. P. Ericson and Olof Hellgren:

Analysing the variation in flight speed among bird species is important in understanding flight. We tested if the cruising speed of different migrating bird species in flapping flight scales with body mass and wing loading according to predictions from aerodynamic theory and to what extent phylogeny provides an additional explanation for variation in speed. Flight speeds were measured by tracking radar for bird species ranging in size from 0.01 kg (small passerines) to 10 kg (swans). Equivalent airspeeds of 138 species ranged between 8 and 23 m/s and did not scale as steeply in relation to mass and wing loading as predicted. This suggests that there are evolutionary restrictions to the range of flight speeds that birds obtain, which counteract too slow and too fast speeds among bird species with low and high wing loading, respectively. In addition to the effects of body size and wing morphology on flight speed, we also show that phylogeny accounted for an important part of the remaining speed variation between species. Differences in flight apparatus and behaviour among species of different evolutionary origin, and with different ecology and flight styles, are likely to influence cruising flight performance in important ways.

Update: Grrrlscientist explains the study in plain English.

Aphids and Enemies

You really don’t want to be an enemy of the aphids – two papers today! The first is quite straightforward:
Aphids Make ‘Chemical Weapons’ To Fight Off Killer Ladybirds:

Cabbage aphids have developed an internal chemical defence system which enables them to disable attacking predators by setting off a mustard oil ‘bomb’, says new research. The study shows for the first time how aphids use a chemical found in the plants they eat to emit a deadly burst of mustard oil when they’re attacked by a predator, for example a ladybird. This mustard oil kills, injures or repels the ladybird, which then saves the colony of aphids from attack, although the individual aphid involved usually dies in the process.

So, these aphids directly defend themselves against their own enemies by using the chemicals they derives from the plants they eat. But the next study introduces more complexity – several levels of the food web (i.e., tri-trophic relationship);
High Susceptibility of Bt Maize to Aphids Enhances the Performance of Parasitoids of Lepidopteran Pests:

Concerns about possible undesired environmental effects of transgenic crops have prompted numerous evaluations of such crops. So-called Bt crops receive particular attention because they carry bacteria-derived genes coding for insecticidal proteins that might negatively affect non-target arthropods. Here we show a remarkable positive effect of Bt maize on the performance of the corn leaf aphid Rhopalosiphum maidis, which in turn enhanced the performance of parasitic wasps that feed on aphid honeydew. Within five out of six pairs that were evaluated, transgenic maize lines were significantly more susceptible to aphids than their near-isogenic equivalents, with the remaining pair being equally susceptible. The aphids feed from the phloem sieve element content and analyses of this sap in selected maize lines revealed marginally, but significantly higher amino acid levels in Bt maize, which might partially explain the observed increased aphid performance. Larger colony densities of aphids on Bt plants resulted in an increased production of honeydew that can be used as food by beneficial insects. Indeed, Cotesia marginiventris, a parasitoid of lepidopteran pests, lived longer and parasitized more pest caterpillars in the presence of aphid-infested Bt maize than in the presence of aphid-infested isogenic maize. Hence, depending on aphid pest thresholds, the observed increased susceptibility of Bt maize to aphids may be either a welcome or an undesirable side effect.

Translation: transgenic corn has somewhat more nutritional value for the aphids. Thus, there are more aphids (per plant) on such corn. Thus, there is more “honeydew” (per acre) that they produce. Thus, there is more food (per acre) for the wasp. Thus, there are more wasps in the field. Thus, they are better able to control the population of moth caterpillars. Thus, there are fewer caterpillars to eat the corn. Final result: the farmer is happy. Now go to the paper itself and add comments, annotations and ratings to it.

Horseshoe crabs

Such fascinating creatures! If you have missed it so far, don’t miss it now – the two-part series by Mark H on DailyKos:
Marine Life Series: Horseshoe Crab Basics
Marine Life Series: Horseshoe Crab Anatomy
One day when I find some time, I’ll have to write a long detailed post about the fascinating aspects of the circadian system and vision in the horseshoe crab (oh, some of which was done by Erik Herzog, so you know I like the stuff!).

Altruism in rats

There is a new paper on PLoS-Biology describing a tit-for-tat-like reciprocal behavior in rats: Generalized Reciprocity in Rats:

The evolution of cooperation is based on four general mechanisms: mutualism, where an action benefits all partners directly; kin selection, where related individuals are supported; “green beard” altruism that is based on a genetic correlation between altruism genes and respective markers; and reciprocal altruism, where helpful acts are contingent upon the likelihood of getting help in return. The latter mechanism is intriguing because it is prone to exploitation. In theory, reciprocal altruism may evolve by direct, indirect, “strong,” and generalized reciprocity. Apart from direct reciprocity, where individuals base their behavior towards a partner on that partner’s previous behavior towards themselves, and which works under only highly restrictive conditions, no other mechanism for reciprocity has been demonstrated among conspecifics in nonhuman animals. Here, we tested the propensity of wild-type Norway rats to help unknown conspecifics in response to help received from other unknown partners in an instrumental cooperative task. Anonymous receipt of help increased their propensity to help by more than 20%, revealing that nonhuman animals may indeed show generalized reciprocity. This mechanism causes altruistic behavior by previous social experience irrespective of partner identity. Generalized reciprocity is hence much simpler and therefore more likely to be important in nature than other reciprocity mechanisms.

Kate wrote a clear and excellent summary of the study.

Doesn’t reading about this make you salivate?

cockroach.jpgProbably not. You are not one of Pavlov’s dogs, after all. Or a Pavlov’s cat for that matter. Or a Pavlov’s sea slug. But, see what’s your salivary response to reading a brand new paper on Pavlov’s cockroaches and report your findings in the comments.

Parenting

There are a lot of people blogging about their kids. But when Kate writes about parenting issues, it is pure science. After attending a meeting on parental behavior, she’s been churning out post after post on this fascinating topic:
Cheetah Infidelity and the Bruce Effect
Bird brains and sex reversal
Thanks, Dad – the paternal brain and his selfish genes
Thanks, Dad – footage of a paternal eagle
Perhaps there will be more over the next few days, so stay tuned…

Invisibility Cloak

When I was a kid I swallowed science-fiction by the crates. And I was too young to be very discerning of quality – I liked everything. Good taste developed later, with age. But even at that tender age, there was one book that was so bad that not only did I realized it was bad, it really, really irked me. It was The Ayes of Texas (check the Amazon readers’ reviews!), a stupid 1982 Texas-secessionist fairy-tale in which a rich (and of course brilliant and smooth with ladies) conservative Texan, by throwing millions of dollars at scientists, gets all sorts of new gizmos and gadgets which he uses to win the Cold War by defeating both the Soviet and the US military, ending with Texas as the remaining standing military superpower. Hey, at that age I barely new where Texas was but the whole schtick was so sick, not to mention the stupid idea that scientific discovery can be bought just like that, with bags of money and few weeks of effort!
Anyway, since I doubt you’d care if I spoiled the plot of a book that you will not and should not read, the key weapon in the battle was an old WWII battleship armed with new types of weapons and, most importantly, made invisible by being plastered with panels made of a new material (which, if I remember correctly, break several laws of physics).
And while the invisibility panels as described in the book were impossible, that does not mean that nobody’s ever looked at the possibility of making materials that can make stuff more-or-less invisible. There was a report last year that saw a lot of press, and recently a new one came out, looking at chemicals called reflectins, coded by six genes unique to squid. Cephalopods rule, of course, and the distribution of reflectins in the skin is under the neural control of melanophores in cuttlefish and octopods.
Now, as MC explains very well, a new paper came out describing the properties of reflexins inserted into and expressed in E.coli. Then, reflexin synthetized by bacteria were coaxed into forming films on the surface of water and the light-reflecting properties were studies under varying conditions. You’ll have to read MC’s post for details.
Anyway, as MC notes, this is clearly of interest to the military, though I doubt they’ll ever use the synthetic reflexins to coat a WWII-era warship in order to defeat both the Soviet and the US armies in order to secede and form a Greater Texas.

Amazing Nature Picture of the Day

Tanja was lucky last night. She and her husband were filming bats out in Arizona. At one moment she picked up her cheap camera and aimed it at the sky at just the right moment to catch this picture of a kestrel (Falco sparverius) catching a Mexican Free-tailed Bat (Tadarida brasiliensis) – due to size, under the fold:

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Flirting under Moonlight on a Hot Summer Night, or, The Secret Night-Life of Fruitflies

Blogging on Peer-Reviewed Research

As we mentioned just the other day, studying animal behavior is tough as “animals do whatever they darned please“. Thus, making sure that everything is controlled for in an experimental setup is of paramount importance. Furthermore, for the studies to be replicable in other labs, it is always a good idea for experimental setups to be standardized. Even that is often not enough. I do not have access to Science but you may all recall a paper from several years ago in which two labs tried to simultaneously perform exactly the same experiment in mice, using all the standard equipment, exactly the same protocols, the same strain bought from the same supplier on the same date, the same mouse-feed, perhaps even the same colors of technicians’ uniforms and yet, they got some very different data!
The circadian behavior is, fortunately, not chaotic, but quite predictable, robust and easily replicable between labs in a number of standard model organisms. Part of the success of the Drosophila research program in chronobiology comes from the fact that for decades all the labs used exactly the same experimental apparatus, this one, produced by Trikinetics (Waltham, Massachusetts) and Carolina Biologicals (Burlington, North Carolina):
drosophila%20apparatus.jpg
This is a series of glass tubes, each containing a single insect. An infrared beam crosses the middle of each tube and each time the fly breaks the beam, by walking or flying up and down the tube, the computer registers one “pen deflection”. All of those are subsequently put together into a form of an actograph, which is the standard format for the visual presentation of chronobiological data, which can be further statistically analyzed.
The early fruitfly work was done mainly in Drosophila pseudoobscura. Most of the subsequent work on fruitfly genetics used D.melanogaster instead. Recently, some researchers started using the same setup to do comparative studies of other Drosophila species. Many fruitfly clock labs have hundreds, even thousands, of such setups, each contained inside a “black box” which is essentially an environmental chamber in which the temperature and pressure are kept constant, noise is kept low and constant (“white noise”), and the lights are carefully controlled – exact timing of lights-on and lights-off as well as the light intensity and spectrum.
In such a setup, with a square-wave profile of light (abrupt on and off switches), every decent D.melanogaster in the world shows this kind of activity profile:
fruitfly%20crepuscular.JPG
The activity is bimodal: there is a morning peak (thought to be associated with foraging in the wild) and an evening peak (thought to be associated with courtship and mating in the wild).
The importance of standardization is difficult to overemphasize – without it we would not be able to detect many of the subtler mutants, and all the data would be considered less trustworthy. Yet, there is something about standardization that is a negative – it is highly artificial. By controlling absolutely everything and making the setup as simple as possible, it becomes very un-representative of the natural environment of the animal. Thus, the measured behavior is also likely to be quite un-natural.
Unlike in the lab, the fruitflies out in nature do not live alone – they congregate with other members of the species. Unlike in a ‘black box’, the temperature fluctuates during the day and night in the real world. Also unlike the lab, the intensity and spectrum of light change gradually during the duration of the day while the nights are not pitch-black: there are stars and the Moon providing some low-level illumination as well. Thus, after decades of standardized work, it is ripe time to start investigating how the recorded behaviors match up with the reality of natural behavior in fruitflies.
Three recent papers address these questions by modifying the experimental conditions in one way or another, introducing additional environmental cues that are usually missing in the standard apparatus (and if you want to know what they found, follow me under the fold):

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Yes, dolphins are smart!

Remember last summer when some guy named Paul Manger wrote a paper asserting how dolphins and other Cetaceans are really quite dumb? There was quite an interesting discussion about it on blogs back then, e.g., here, here, here and here.
Now, a formal rebuttal got published in PLoS-Biology:
Cetaceans Have Complex Brains for Complex Cognition:

The brain of a sperm whale is about 60% larger in absolute mass than that of an elephant. Furthermore, the brains of toothed whales and dolphins are significantly larger than those of any nonhuman primates and are second only to human brains when measured with respect to body size [1]. How and why did such large brains evolve in these modern cetaceans? One current view of the evolution of dolphin brains is that their large size was primarily a response to social forces–the requirements for effective functioning within a complex society characterized by communication and collaboration as well as competition among group members [2-4]. In such a society, individuals can benefit from the recognition of others and knowledge of their relationships and from flexibility in adapting to or implementing new behaviors as social or ecological context shifts. Other views focus on the cognitive demands associated with the use of echolocation [5-7].
Recently, Manger [8] made the controversial claim that cetacean brains are large because they contain an unusually large number of thermogenic glial cells whose numbers increased greatly to counteract heat loss during a decrease in ocean temperatures in the Eocene-Oligocene transition. Therefore, he argues, cetacean brain size could have evolved independently of any cognitive demands and, further, that there is neither neuronal evidence nor behavioral evidence of complex cognition in cetaceans. These claims have garnered considerable attention in the popular press, because they challenge prevailing knowledge and understanding of cetacean brain evolution, cognition, and behavior.
We believe that the time is ripe to present an integrated view of cetacean brains, behavior, and evolution based on the wealth of accumulated and recent data on these topics. Our conclusions support the more generally accepted view that the large brain of cetaceans evolved to support complex cognitive abilities.

The entire paper is well written and not too technical so anyone with some basic science background can understand it. And yes, the dolphins are smart.

The Fly Buzz Continues

The Fly Spontaneous Behavior paper is generating quite a lot of buzz.
Bjorn has collected some of the best blogospheric responses, including these from Mark Chu-Carroll, Mark Hoofnagle and Kate.
He also got Slashdotted – of course, whoever posted that on Slashdot failed to a) link to the paper, b) link to the press release and c) link to Bjorn’s blog. Instead, a little blurb from one of the worst media articles from MSNBC is the only link. Those got linked later in the comments, so I hope Bjorn enjoys the traffic (it will go away tomorrow never to come back again).
Bjorn has also posted two good posts about the scientific and popular aspects of the paper that can clear stuff up.

And now the scientists will do whatever they damned please (start shouting, most likely)

Google was really no help in finding the exact quote, but everyone in the animal behavior field has heard some version of the Harvard Rule of Animal Behaviour:

“You can have the most beautifully designed experiment with the most carefully controlled variables, and the animal will do what it damn well pleases.”

Anyone here knows who actually said that and what were the exact words?
Anyway, one way to re-word the “whatever they damned please” is to call it “free will”. Björn Brembs says so but apparently not everyone agrees. The discussion in the media and on blogs is just about to start because Bjorn’s paper about spontaneous behavior in Drosophila just came out today (after quite a long wait). You can read the summary by Bjorn, but I also suggest you try to read the actual paper. If seemingly spontaneous behavior can be described by mathematical formulas, even if it is chaotic dynamics, is it then, really, quite deterministic? If so (or if not) can it be called “free will”? If not, is there a better term for it?
Keep an eye on the discussion on Bjorn’s blog as well as the discussion attached to the PLoS-ONE paper itself and, if you have read and understood the paper, please contribute to the discussion. This is bound to get very interesting over the next several days.

More on duck phalluses and uteri

Of course, I was not the only one commenting on the recent duck phallus paper. You should check out the other blogospheric responses, e.g., by Carl, PZ, RPM, Grrrl, Laelaps, Neil, Belle, Zuzu, Guru and many others.
Unfortunately, most people link only to each other, or to the press release, or to the NYTimes article. The articles are fine, but they are simplified for the mass audience. If you are a scientist, you should read the original paper to get all the details.
Furthermore, many commenters on blogs have asked some very good questions about the research which remained unanswered, e.g., about the teleological language used in the article, the male bias, the individual variation within species, the season-to-season changes in males, and the appropriateness of the use of terms like “rape” in the context of animal behavior.
There is a place for asking (and answering, if you have the expertise) those questions – at the discussion forum of the paper itself where two good questions have already been asked. Just click here.

Monday Weird Sex Blogging….

…because weird sex does not only happen on Fridays….
Remember this? Many have asked themselves (I did) where does it go, i.e., what kind of female genital tract can accomodate such a large penis. But one person actually did not stop at wondering but set out to find out. You can find out who and how and why in Carl Zimmer’s today’s NYTimes article about today’s PLoS-One paper.

Diurnal Rhythm of Deep-Sea Diving in Whale Sharks

Yup, that was going to be the title of this post. I got the paper and was ready to write the post when I noticed that Peter scooped me and posted about the same paper today (yup, there is just not that many cool papers on Charismatic Marine Megavertebrates to spread around this week). I have nothing to add, so just go and see his post:

The results demonstrated that a free-ranging whale shark displays ultradian, diel and circa-lunar rhythmicity of diving behaviour. Whale sharks dive to over 979.5 m, making primarily diurnal deep dives and remaining in relatively shallow waters at night.

Do whales sleep?

It is Marine Megavertebrate Week right now, so why not take a look at one of the most Mega of the Megaverts – the grey whale (Eschrichtius robustus):
Eschrichtius%20robustus.jpg
Do whales sleep? You may have heard that dolphins do – one hemisphere at the time, while swimming, and not for very long periods at a time. A combined Russian/US team of researchers published a study in 2000 – to my knowledge the best to date – on sleep-wake and activity patterns of the grey whale: Rest and activity states in a gray whale (pdf) by Lyamin, Manger, Mukhametov, Siegel and Shpak.

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But do they stop to ask for directions?

Sex And Prenatal Hormone Exposure Affect Cognitive Performance:

Yerkes researchers are using their findings to better understand sex differences in cognitive performance, which may lead to increased understanding of the difference in neuropsychological disorders men and women experience.
In one of the first research studies to assess sex differences in cognitive performance in nonhuman primates, researchers at the Yerkes National Primate Research Center have found the tendency to use landmarks for navigation is typical only of females.
This finding, which corroborates findings in rodents and humans and is available in the online edition of Hormones and Behavior, suggests there is not just a difference in how well females and males solve spatial problems, but also in which types of cues they use to solve such problems. Researchers are applying this knowledge to gain a better understanding of how the brain develops and functions.

Mind of a Raven

When my ‘Scientific American’ arrived the other day, I was excited to read the article about ravens by Bernd Heinrich, as I loved his book Mind of a Raven. I was also glad to see that new cool experiments have been done since the book came out. But I wondering how to blog about an article that is behind the subscription wall, so in the end, I abandoned the idea.
Now, Grrrlscientist comes to the rescues with an excellent summary of the article, that is well worth your time.

Belgrade Zoo needs to move!

Long time ago, I mentioned here something about the Belgrade Zoo. The power of Google brought a Belgrader, Sonja, to my blog, who alerted me to the dire conditions in which the Zoo is right now and the existence of her website (made by her and her students) called Zoo SOS whose goal is to force the City government of Belgrade to move the Zoo from its present location to a better place outside town (not having to deal with the Animal Rights terrorists there, they must have placed a link to PETA by mistake – they do not know the distinction between Animal Rights and Animal Welfare. Update: The PETA link has been removed.).
Belgrade Zoo is located on Kalemegdan, the most ancient (from Roman through Turkish times) part of Belgrade. The zoo is small, and most of it is on stone and concrete. You can see some pictures of it here (just keep clicking on “Next” until you see them all).
Belgraders love their zoo. It is one of the favourite spots to spend a weekend. But it is also depressing to see animals crowded in small cages. It is especially painful for those of us who have seen modern zoos, like the one here in Asheboro, where animals are free to roam over many acres of land specifically designed to mimic their natural habitats.
The Belgrade Zoo is better called a ‘menagerie’ than a Zoo. It is an old-style city zoo, where the main goal is entertainment, while conservation and education play small or no role. It is not affiliated with any international zoo associations, so the nasty conditions in which animals live are cannot be addressed in any way by the rest of the world.
From its very inception, 80 years ago, there was a talk about moving it outside of the stony fortress and onto a bigger, nicer piece of land. Of course, that would make it less accessible to the citizens and tourists, thus probably reducing the revenue. So there has always been a tension between the people who did and people who did not want to see the Zoo moved.
After decades of neglect, Belgrade Zoo got a new Director in the mid-eighties: Vuk Bojovic. The relationship between the citizens of Belgrade and Vuk is quite schizophrenic – some love him, some hate him, but most have a strange love-hate relationship with him.
He is, in person, actually quite a pleasant fellow. But working for him is horror.
He loves animals and has a nice ‘touch’ with them. On the other hand he does not know anything about animals and is not prepared to listen to the experts.
He loves the attention he gets, but that also brings attention to the Zoo, so nobody is really sure how much of his posing is self-love and how much is a Zoo-promoting stunt.
He built a legend around himself as the only person who could pack medication into the tooth of the elephant Boy (who died a couple of years later, just to be replaced by an unwanted, man-killing female ditched by a Dutch zoo). Unlike his predecessors, elephants Tasa and Mita who were sweethearts (I remember feeding them peanuts by hand when I was a kid), Boy had a nasty temper, so the regular elephant feeders gladly let Vuk take the job and the spotlight – just one less dangerous elephant duty to do every day.
Vuk also brought in the first, one and only chimpanzee that the Zoo ever had – Sammy. Sammy was a smart guy so he made it a routine to escape from his cage and go galivanting around Belgrade. On one hand, that demonstrated that the Zoo is incapable of housing a chimp. On the other hand, he became a media darling – showing up on TV every time he escaped. Again, Vuk built a legend around himself as the only person who could approach, catch and recapture Sammy. So, TV crews often had great fun filming 40-something bearded Vuk climbing a tall poplar trying to lure Sammy down.
All those stunts brought interest of Belgraders back to the zoo after many decades. People started coming in. Money started flowing in. And the money was used to make the Zoo pretty – for people. Nothing was done to make the life of animals much better.
Now, that marketing strategy – painting the buildings, opening a new restaurant, offering pony rides for kids, etc. – may have been OK if it lasted the first year or so until enough money is collected to actually start using it for the benefits of animals. But, after 20 years, it does not sound so smart any more.
Then, the 90s came and the wars and sanctions ruined the economy of the country – not to mention the psyche of the people living there, painted as pariahs by the world, painted as villains in the movies, and not given any help to actually get rid of Milosevic (not to mention to retain Kosovo, and get rid of the Al Qaida HQ located there – aiding the KLA terrorists)…
There was no money to feed people, so who had the money to feed the animals? And as the war spread throughout the country, many small zoos had to be evacuated and all the animals brought to the Belgrade Zoo. Already lacking space and resources, the Zoo had to accept dozens of wolves, bears, wild boars, deer, etc. They all had to end up in tiny little cages because there was just no space for them. Yet, although hungry themselves, Belgraders donated meat to the Zoo to feed the animals.
In the 1999, when Belgrade was bombed, electricity would run out and all the meat would get spoiled in the freezers – good only for vultures and hyenas. Water was fouled. There was not enough water to keep the pools for hippos, polar bears, sea lions and penguins full. Eggs of rare birds rotted in the incubators. Daily bombing turned even the calmest animals into psychos – one tiger started chewing his own front toes!
During all that time, Vuk started doing some shady business, including smuggling of exotic animals (he almost smuggled in another elephant!). And now – he is the most vocal opponent of the move to the periphery of the city.
The initial idea was to relocate the Zoo to the Veliko Ratno Ostrvo, a large sandy island in the middle of the Danube at the spot where river Sava flows into it – that is: smack in the middle of Belgrade, but away from any regular streets (they would have built a bridge for the Zoo – right now the only way to get there is by boat).
Right now, the new proposed location is in Surcin, between Sava and the airport. It is not as big as Asheboro Zoo – not even close – but it is much bigger land than what the Zoo has now and it is not all stone and concrete! It would definitely be an improvement and, being built from scratch, it would be built in the most modern way possible, keeping the welfare of animals first and foremost as the goal of the entire operation.
As the Zoo is not part of any international association, and Serbia is now not a signator of any international agreements on regulation of animal keep and trade, and as the Zoo Director himself is the most vocal opponent of the move, the only people who can do something about it are the members of Belgrade city government and the mayor. And those people need LOTS of pressure to move on any matter, not just the Zoo. Most of that pressure has to come from locals, but we can help, by signing this petition, by writing about it and spreading the word. So, do it.

How Elephants Walk on Hot Coals? By Having Hot Feet

Russ noted that someone is using thermography to study thermoregulation in elephants:

Wits University has just completed studies on how elephants cope with high African temperatures and how that influences their behaviour. In African savannahs, elephants are exposed to high environmental heat loads during the day and low ambient temperatures at night and yet these animals are able to cope quite adequately.

Animals that run the risk of losing energy by dissipating heat often deal with this via regional heterothermy, i.e., wading birds have cold legs so there is less of a heat loss when they are standing in cold water. This is often accomplished by using counter-current setup which I explained in detail before. Elephants have the opposite problem – overheating and they solve it by heating the periphery (e.g., ears) and letting the heat dissipate. They also deal with walking on hot ground by heating their feet, it appears.
Or, if you’d rather look at basic principles than biological details, you may just start by assuming an elephant as a sphere. Bigger the sphere, smaller the surface-to-volume ratio and harder it is to lose heat. That is why penguins in the Antarctica are bigger than penguins living further north on the coasts of Africa or New Zealand (this is also called Bergman’s rule in ecology).
Also, deviating from the shape of the sphere increases heat loss. That is why desert foxes have longer ears, snouts and tails than Arctic foxes (this is called Allen’s rule in ecology).
Since the elephants at the NC Zoo are about to get a new house with a pool, perhaps this can be a good place to study elephant thermoregulation as well.

A question regarding dog training

We’ve had a few dogs over the years and housebreaking them was never a big problem. But now we got my mother-in-law’s puppy labradoodle – who is a real sweetheart – for a couple of weeks to see if we can housebreak him because she was not successful.
My wife turned out to be a better animal psychologist than I am and figured out what the problem is. This is not a case of a little puppy who is not yet housebroken. This is a case of a puppy that was inadvertenly trained to poop inside the house and not outside. What we think happened is either that the dog got yelled at when he soiled the carpet, or something unfortunately scary happened when he was doing it outdoors. He seems to be worse about it now thahn he was two months ago. Now, he appears to be afraid of doing it when a human is watching. And out on a leash-walk, a human is always watching. Indoors, there can always be a moment when one can sneak away and do it in the bathroom (or wherever the door is not closed at the time).
He’s been with us for a week and he managed to poop outside only once – for my wife – and promptly got rewarded and fussed over. But once is not enough. Only once I managed to catch him in the act and, without any anger, I quickly took him for a long walk during which he did NOT do it!
Now, if I had a fenced in yard, I’d let him out – it’s been in the 80s here lately so it is warm even during the night – and keep an eye on him through the window so, if I saw him pooping outside, I could get out quickly to give him a big reward. But I do not have a yard at all – we live in an appartment complex, so even tying him up on a very long rope is out of the question. Perhaps getting one of those super-long leashes would do the trick as he could get 20, 30 or 40 yards away from me (forgetting the whole training on how to walk properly on a leash) and do his tricks without me hovering over him – perhaps one of those fancy leashes with the button to haul him back for a reward afterwards.
I will have him for another week. After that he has to go back so we can thoroughly clean the house and wash the carpets in time for the Passover dinner (perhaps he can come back for a second course afterwards). And I am out of ideas.
I don’t know if Christie still reads my blog, but I assume that some of my readers have some experience and knowledge and good ideas about what to do. Shoot them in the comments.

Bird Brains…

Eavesdropping Nuthatches Appear To Understand Chickadees In Distress:

If Dr. John Watson had been chronicling the work of Christopher Templeton rather than the exploits of Sherlock Holmes, he might have entitled the latest research by Templeton “The Adventure of the Avian Eavesdroppers.” The University of Washington doctoral student has found the first example of an animal making sophisticated decisions about the danger posed by a predator from the information contained in the alarm calls of another species.

Grrrrl explains.

Animal Migration

Animal Migration: New Technologies, Global Warming Add Impetus To Research:

The February 2007 issue of BioScience, the monthly journal of the American Institute of Biological Sciences (AIBS), includes a special section on animal migration that features six articles exploring biologists’ understanding of this pervasive and vital syndrome. Animal migration fascinated the ancients and continues to fascinate researchers today. An often highly complex, synchronized suite of changes in behavior, morphology, and physiology enables journeys that may be epic in scale. These feats of endurance and navigation are widely regarded as some of the most astonishing of nature’s spectacles. Researchers have gained some important insights into the evolution of migration, yet very much remains unknown about the multiple mechanisms that animals call on when they migrate.

The series of papers appears in the latest issue of BioScience (which, back in the day when I could afford it, I was subscribed to). The papers include:

What Is Migration?
pp. 113-121(9)
Authors: Dingle, Hugh; Drake, V. Alistair
How Migrants Get There: Migratory Performance and Orientation
pp. 123-133(11)
Authors: Åkesson, Susanne; Hedenström, Anders
Regulation of Migration
pp. 135-143(9)
Authors: Ramenofsky, Marilyn; Wingfield, John C.
Migration, Patchiness, and Population Processes Illustrated by Two Migrant Pests
pp. 145-154(10)
Authors: Cheke, Robert A.; Tratalos, Jamie A.
The Evolution and Genetics of Migration in Insects
pp. 155-164(10)
Authors: Roff, Derek A.; Fairbairn, Daphne J.
The Genetics and Evolution of Avian Migration
pp. 165-174(10)
Author: Pulido, Francisco

Regulation of Migration by Ramenofsky and Wingfield is the only one I can get from free. Is there an AIBS member reading this blog who could download and send me the PDFs of the other migration papers, please? I promise a nice long post (or even more than one) on the topic….

Physiology: Coordinated Response

Physiology: Coordinated ResponseThis is the last in the 16-post series of BIO101 lecture notes for a speed-course targeted at adults. As always, I welcome corrections and suggestions for improvement (June 17, 2006)…

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Inbreeding is Not Always Bad

For Some Species, An Upside To Inbreeding:

Although breeding between close kin is thought to be generally unfavorable from an evolutionary standpoint, in part because harmful mutations are more easily propagated through populations in this way, theory predicts that under some circumstances, the benefits of inbreeding may outweigh the costs.
Researchers have now reported real-life evidence in support of this theory. Studying an African chiclid fish species, Pelvicachromis taetiatus, in which both parents participate in brood care, the researchers found that individuals preferred mating with unfamiliar close kin rather than non-kin.

Actually, this same result was obtained in Japanese quail about 20 years ago or so. The quail breeding colony I worked with is extremely inbred and is thriving. Contrary to expectations of some others in the lab who were trained in classical population genetics, I was confident that we are not going to see a sudden crash of our population due to inbreeding and I was right for all these years.

Because parental work is energetically costly, and kinship generally favors cooperation, one possible explanation for kin preference in breeding in this species is that it offers a benefit by facilitating parental cooperation. And indeed, observations of behavior exhibited by this chiclid species showed that related parents were more cooperative and invested more resources in parenting than did non-related parents.
Together, the findings suggest that, somewhat unusually, active inbreeding is advantageous in this fish species. The findings, reported by Timo Thünken and colleagues of the University of Bonn, appear in the February 6th issue of Current Biology.

Actually, as quail live in tightly-knit coveys of about 10-12 individuals (and the Asian species, livig up in Siberia, may never split the coveys in spring due to thermoregulatory advantages of covey-living), this was exactly the explanation I had for the advatntages of inbreeding in our quail colony.
You can read the actual paper here:
Active Inbreeding in a Cichlid Fish and Its Adaptive Significance

Friday Weird Sex Blogging – Sensory Neuroscience

In a time-crunch like this, one can always count on Buzz Skyline to save the day…..

Some Novel Uses For Christmas Trees

Why burn or recycle when zoo animals love them – some eat them, some play with them, but they are certainly not wasted.
Hat-tip: Russlings

What Creatures Do: Animal Behavior

BIO101: What Creatures Do: Animal BehaviorHere is the next installment of my lecture notes for teh adult education speed-class in biology. As always, I ask for corrections and suggestions for improvement (May 20, 2006):

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More pictures of the NC Zoo lion cub triplets

Go here and here.
Hat-tip: Russ Williams

CO2 Receptors in Insects

Identification Of Carbon Dioxide Receptors In Insects May Help Fight Infectious Disease:

Mosquitoes don’t mind morning breath. They use the carbon dioxide people exhale as a way to identify a potential food source. But when they bite, they can pass on a number of dangerous infectious diseases, such as malaria, yellow fever, and West Nile encephalitis. Now, reporting in today’s advance online publication in Nature, Leslie Vosshall’s laboratory at Rockefeller University has identified the two molecular receptors in fruit flies that help these insects detect carbon dioxide. The findings could prove to be important against the fight against global infectious disease.

This is a very important finding. For context of the importance of CO2 in transmission of malaria, check out this.