Monday, December 15, 2014

Science Beat: Round 3

Sometimes science just makes more sense with a beat. Last January, I shared with you some fun music videos on fish genetics, climate science, and sexual reproduction. In Round 2, we saw music videos on the periodic table, cellular respiration and muscles. Here are the competitors for Round 3:

Cellular Biology:



Anatomy and Physiology:



Taxonomy:



Vote for your favorite in the comments section below and check out other sciency song battles at Science Song Playlist, The Science Life, Science Beat and Science Beat: Round 2, Scientist Swagger and Battle of The Grad Programs!

And if you feel so inspired, make a video of your own, upload it on YouTube and send me a link to include in a future battle!

Monday, December 8, 2014

The Truth Behind Those Sleeping Bears (A Guest Post)

By Tabitha Starjnski-Schneider

Name some animals that hibernate.

Was the first one mentioned a bear? That’s understandable…you were probably told that bears go to sleep shortly before winter, stay asleep the entire winter, and wake up in early spring.

What if I told you that your teachers lied to you, and that bears don’t actually hibernate?! Not a true hibernation, at least.

For an animal to be considered a true hibernator, it actually needs to stay in a sleep state for months at a time (like during an entire season), but also lower its body temperature far below where most other animals barely survive. Such an animal thus hibernates by lowering its metabolism, dropping its body temperature, and passing, most commonly, much of the winter in this Rip Van Winkle state. The many challenges of enduring a long and strenuous season such as winter, while "sleeping" it away, are complicated, but here we talk about just a couple.

Something your teacher may have also told you was that bears are mammals, and therefore are "warm-blooded". That seems a little silly; all animals with blood are going to have warm blood. Bears are actually called endothermic, meaning they don’t have to rely on warming or cooling their bodies by outside forces such as the sun. While undergoing this sleep-state, bears possess internal and external temperature control. These animals slightly lower their heart rate and body temperature internally and minimize their external movements in an effort to save energy and conserve heat. Of course these periods of reduced heart rate, temperature and inactivity don’t actually last all winter, as with true hibernation, but only a few weeks at a time. This overall ability and state is called torpor, not true hibernation. And although there is debate over the definitions of each, most researchers believe there is enough of a difference to categorize them separately (like cat naps versus comas).

One of the reasons for taking these naps is as basic as why we grocery shop. When the environment changes in such a way that doesn’t suit an animal (i.e. an empty fridge), they can better survive by conserving energy and going inactive until food returns. Before napping however, each adult bear will begin to dig a den, hollow out a tree trunk, and/or find a cave to prepare for winter. Once tucked away in their little beds, they use these dens like a Thermos, retaining as much of their body heat as possible. For the most part, these giants go to sleep for a few weeks at a time, wake up to warm their bodies some, then fall back asleep. This occurs over the course of a winter season until spring arrives and the bear can reemerge into the re-warmed world outside.

There is another, more important reason why these bears slumber though. After breeding in spring/summer, these mammals begin their fall-time buffet, eating foods high in carbohydrates and fat to gain as much weight as possible. Why you ask? So that the mothers gain enough fat and energy to develop, birth, and feed their young while in the winter hideaways. Ever see the videos of polar bears emerging with their cubs from a snowy fortress in the side of a hill?


Now how could they ever give birth if they were sleeping the whole time? It’s the same with black bears and grizzly bears, for that matter.

It all sounds pretty cool right? These mama bears should be given a medal for their dedication. And the next time someone refers to bears hibernating, you can assuredly respond that they actually enter a state of torpor, or winter-long cat naps.

Monday, December 1, 2014

Crocodilians Hunt With Tools!

A crocodile lures in birds with sticks that would make a nice nest.
Photo by Dinets published in Ethology, Ecology & Evoluton 2013.
What would happen to mankind if crocodiles and alligators were to develop enough intelligence that they could hunt with tools? Would we see the rise of new dominant species as in Rise of the Planet of the Apes?

Well, shudder in your boots, people, because we are already there!

This week at Accumulating Glitches I talk about the discovery of how at least two species of crocodilians use tools to lure in prey. Check it out here.


And to learn more, check this out:

Dinets, V., Brueggen, J.C.. and Brueggen, J.D. Crocodilians use tools for hunting, Ethology Ecology & Evolution, (2013). DOI: 10.1080/03949370.2013.858276.

Monday, November 24, 2014

Let’s Talk Turkey: 8 Surprising Facts About Turkeys

A wild male turkey struts his stuff.
Photo by Lupin at Wikimedia Commons.
1. Turkeys are all-American. The modern domesticated turkey is descended from the wild turkey of North America, which is essentially a pheasant.

2. Domestic turkeys can’t fly or have sex. Domestic turkeys have been bred to have enormous breast muscles for our dinner tables. Their breast muscles have become so large that these top-heavy birds have lost the ability to fly and even to have sex! Domestic turkey eggs now have to be fertilized by artificial insemination. Wild turkeys with their functionally-sized breast muscles, however, can fly up to 55 mph for short distances and have sex just fine.

3. Male turkeys (called toms) are courtship-machines. Wild turkey males are substantially larger than females, and their 5,000 to 6,000 feathers have red, purple, green, copper, bronze, and gold iridescence. Like peacocks, male turkeys puff up their bodies and spread their elaborate feathers to attract mates and intimidate rivals. In comparison, female wild turkey feathers are duller shades of brown and grey to better hide from predators. And as if their flashy feathers weren’t enough, toms also have fleshy body appendages called snoods (the fleshy snotsicle that hangs over their beak) and wattles (the thing that looks like a scrotum under their chin). When the male is excited, the snood and wattle fill with blood and turn bright red. Sexy!

4. Turkeys are intelligent animals. They even have the ability to learn the precise details of a 1,000-acre area. And no, turkeys will not drown if they look up into the sky during a rainstorm.

5. Turkeys are social animals. They create lasting social bonds with each other and are very affectionate. Turkeys can produce over 20 different vocalizations, including the distinctive gobble (produced only by males), which can be heard up to a mile away! Individual turkeys have unique voices that they use to recognize each other.

6. Female turkeys (called hens) are good moms. Wild turkey babies (called poults) are precocial, which means that they hatch out of their eggs already covered in fluffy down and able to walk, run and feed themselves. They stick close to their mother for protection from predators, but unlike many other species of bird mothers, she doesn't have to feed them. Although wild turkeys roost in the trees at night to avoid predators, poults are unable to fly for their first few weeks of life. The mother stays with them at ground level to keep them safe and warm until they are strong enough to all roost in the trees with her.

A wild turkey mom and her poults. Photo by Kevin Cole at Wikimedia Commons.

7. Ben Franklin wanted the turkey to be America’s national bird. Benjamin Franklin famously argued that the wild turkey, not the bald eagle, should be America's national bird. In a letter to his daughter, he wrote, "For my own part, I wish the bald eagle had not been chosen as the representative of our country; he is a bird of bad moral character; he does not get his living honestly...like those among men who live by sharping and robbing...he is generally poor, and often very lousy. Besides, he is a rank coward; the little king-bird, not bigger than a sparrow, attacks him boldly and drives him out of the district...For in truth, the turkey is in comparison a much more respectable bird, and withal a true original native of America. Eagles have been found in all countries, but the turkey was peculiar to ours...".

8. Turkeys were once endangered. Although millions of wild turkeys used to live across the Americas, they were almost completely wiped out due to a combination of over-hunting and habitat destruction. Thanks to strong conservation efforts that included better hunting management, habitat protection, captive breeding, and reintroduction into the wild, wild turkey populations are now healthy and found in all of the lower 48 states.

Monday, November 17, 2014

Animal Biology in Science Fiction: The Color of Distance


Ani and two of her community’s elders are foraging when they stumble upon two seemingly lifeless aliens. They are able to restore one of the aliens to health and what follows is a thought-provoking story of first contact between alien worlds. This is Amy Thompson’s The Color of Distance, a science fiction novel written from perspectives that alternate between Juna (the human “alien” scientist stranded on a foreign planet) and Ani (the Tendu female that found her).

The Color of Distance is a rare science fiction story in that the science focuses on possibilities of ecology and physiology. The Tendu are a sentient species with many physical attributes similar to our own amphibians. They have a deep understanding of the ecology of their planet and they take responsibility for the sustainability of their ecosystems. We learn about their planet’s species and ecological relationships through the eyes and thoughts of Juna, a human scientist that was stranded on a mission to explore the planet. The parallels between the species and ecologies on this fictional planet and Earth are too similar for my critical science brain to believe, but they serve well to foster in us more of an appreciation for the wondrous complexities of our own planet.

The Tendu role as caretakers of their planet’s species is supported by their remarkable physiological abilities. The Tendu have fleshy spurs on their wrists, called allu, that they use to communicate and learn about the animals around them. By sinking their spurs into another animal, the Tendu can learn about that animal’s health, diet, emotional state, reproductive state, and many other attributes. Furthermore, through their allu they can manipulate other animals’ health, monitoring them, healing them, even physically altering them! This is a fun idea, but could this even be remotely possible?

In fact, many species on our own planet already have similar abilities! Many animals produce pheromones, chemical compounds that, when detected by another animal, communicate that animal’s health, diet, emotional state, reproductive state, and many other attributes. Many species (including many mammals and insects) use airborne pheromones, but fish and other aquatic animals can perceive chemicals in the water the same way. It is not much more of a conceptual leap to imagine an animal that can inject a spur into another animal’s body to “taste” chemicals that relate to that animal’s health and emotional state. If that spur were also able to release chemicals and compounds, then this could be a means to influence the receiving animal’s health and emotional state as well.

Thompson’s novel also takes us through the emotional journey of a woman trying to make a life for herself in a new land surrounded by people and customs she doesn’t understand. Her writing regularly left me lost in memories of my days in Peace Corps and will likely resonate with anyone who has spent a significant amount of time living abroad.


If you are looking to curl up with a blanket and a good book, this is a good one! It will get you thinking about physiology, ecology, culture and politics in a whole new way.

Have you read The Color of Distance? Can you recommend another science fiction book that focuses on physiology or behavior? If so, please comment below!

For more animal physiology and behavior in science fiction, go here.

Monday, November 10, 2014

The Importance of “Ancient Mating Habits of Whatever”


Photo of Wisconsin State Assembly
Speaker Robin Vos from WisPolitics.com
at Wikimedia Commons.
In the afterglow of the Republican national sweep in last Tuesday’s elections, Wisconsin State Assembly Speaker Robin Vos discussed his agenda for the next legislative session for the state of Wisconsin. Apparently, his agenda includes changes to the state’s support of the public University of Wisconsin System: “[We want] to make sure that people who are in the [University of Wisconsin] System are actually teaching, and they’re not using their time for purposes that don’t directly impact the lives ... of students,” Vos said. “Of course I want research, but I want to have research done in a way that focuses on growing our economy, not on, you know, ancient mating habits of whatever.”

For those of us that teach and do research, statements like these are hurtful and shockingly ignorant in many ways. But the biggest take-home message to me about this comment is how popular and dangerous this sentiment is across the nation because of the scientific community’s failure to communicate the relevance and importance of our work to the general public.

Scientific research takes two major forms: basic research and applied research. If we want “research done in a way that focuses on growing our economy”, we will generally turn to applied research: research that is geared towards solving a specific problem. However, in order to solve our specific problems, we need to have knowledge of how the systems work, what factors influence them and how those factors work. All of this general knowledge is obtained though basic research: research that is geared towards improving our knowledge or understanding without an immediate applied purpose. Applied research would not be possible without the foundation that basic research provides.

Everything we have depends on knowledge gained by past basic research. Many of our farming practices and cancer treatments would not be possible without the discovery of DNA. Medications for mental illnesses and seizures would not exist without continued research on neurotransmitters. The internet and satellite TV would not exist if it were not for support of basic research. Sometimes the potential future applications of basic research are obvious, but most of the time, they are not. Even basic research on the “ancient mating habits of whatever” could provide us with valuable insight on pest controls, agriculture and raising livestock, or even medical treatments. We don’t know exactly where basic research will take us, but we know it will take us forward.

Not only does the knowledge we gain from basic research move us forward, but the very act of conducting the research promotes economic prosperity. For example, the University of Wisconsin – Madison, the flagship university in the University of Wisconsin System, brings in approximately $1 billion every year in grants. This money provides jobs for the faculty researchers, their research staff and their graduate students. It provides additional jobs to people that maintain research facilities, care for research animals, and produce research equipment and supplies. The projects provide training and experience for post-docs, graduate students and undergraduates, who would not otherwise be able to compete for the jobs they aspire to. Simply getting good grades in college is not enough to get into graduate school, medical school or veterinary school. Schools and competitive jobs want applicants with experience. These basic research projects provide students with the opportunities to gain this experience under the supervision of an expert (who, by the way, is also a trained teacher). Supporting basic research is a win-win!

The dangerous lack of appreciation for the value of basic research is not just a Wisconsin problem; It is not just a United States problem; It is a global problem. The general public simply does not get enough information about the value of current research to understand why they should care. Let’s change this! Go to the Ancient Mating Habits of Whatever Facebook page and leave a post about basic research that has impacted you. Summarize your research in 140 characters or less and post it on Twitter with the hashtag #AncientMatingHabitsOfWhatever. Write your representative and tell him or her why basic research matters. Because we cannot move forward without it.

Monday, November 3, 2014

War and Peace


A group of Gelada baboons in Ethiopia.
Photo by A. Davey at Wikimedia Commons.
Syria and Iraq. Ukraine. The Gaza Strip. People are dying in large numbers at the hands of other humans, and for what? Land and resources? Is it really worth it? It is often said that humans are the only species so horrific as to kill its own species in war. But the fact is, we are not alone in what was previously thought to be a uniquely human trait. In many animal groups, individuals will band together in collective defense of territory and resources.

This week at Accumulating Glitches I talk about how group size influences the ability of primate groups to hold their territories. Check it out here.

And to learn more, check this out:

Willems, E.P. Hellriegel, B. and van Schaik, C.P. The collective action problem in primate territory economics, Proceedings of the Royal Society B, 280: 20130081 (2013). DOI: 10.1098/rspb.2013.0081.

Monday, October 27, 2014

Real Zombie-Making Parasites Among Us

The mummified cat and the rat in the crypt of Christ Church in Dublin.
Photo by Adrian Grycuk at Wikimedia Commons.
The Happening, M. Night Shyamalan’s worst panned movie of all time, is a science fiction thriller about people going into a mysterious trance and committing suicide as a result of other mind-hacking species. One of the leading criticisms raised against this movie is the ridiculousness of the premise. One species can’t cause another to willingly commit suicide! …Or can they?

Toxoplasma gondii (we’ll call it T. gondii) is a protozoan parasite that has developed just such mind-hacking abilities! As far as we can tell, T. gondii only reproduces in the digestive tract of cat species, where it lays fertile eggs that are pooped out into the environment. From there, T. gondii eggs can contaminate any number of things that are consumed by other animals, such as rodents, birds, or even humans. When cats eat prey animals that are infected with T. gondii, another generation of parasites is now positioned to reproduce and the cycle continues.

However, prey animals can be pretty good at avoiding cats, in part by avoiding the smell of cats. This is a problem for the reproductive plans of T. gondii. The tiny protozoan has responded to this problem with remarkable biological sophistication: They alter the behavior of their rodent hosts so that the infected rodents find the smell of cat urine so irresistible that they run straight towards their predators! Now, researchers have found that T. gondii-infected rats don’t only like the smell of cat urine, but they even prefer the smell of wild cat urine over the smell of urine of weaker domesticated cats.

A rat checks out odor-soaked papers
in a Y-shaped apparatus. Image from
Kaushik, et al. (2014) in
Integrative and Comparative Biology.
Maya Kaushik, Sarah Knowles and Joanne Webster at the School of Public Heath at the Imperial College of London compared the responses of rats that were either infected with T. gondii or not to urine produced by domestic cats or wild cats. To do this, they put infected or uninfected rats into a Y-shaped apparatus. For each trial, tissue paper soaked in domestic cat urine or wild cat (cheetah or puma) urine was placed in two of the three arms and nothing was placed in the third arm. The researchers then measured how much time the rats spent in each of the three arms and how much they moved.

As expected, the T. gondii-infected rats avoided the cat-urine-soaked arms less than the uninfected rats did. Furthermore, when presented with a choice between arms with wild cat urine versus domestic cat urine, the infected rats (but not the uninfected rats) preferred the smell of the predatory wild cats over the domestic cats! Infected rats also moved more slowly around the wild cat urine compared to domestic cat urine, as if just begging any wild cats that may be around to eat them. It appears that T. gondii have developed a mechanism to turn rats into mindless zombies that practically run into the mouths of the nearest, most vicious cat they can find.

These mind-hacked rat-zombies may not be the only victims of T. gondii. People (particularly those that change their kitties’ litter boxes) can also become infected with the parasite. Some estimates suggest that nearly one-third of all people are already infected! Furthermore, people that test positive for T. gondii infection find the smell of cat urine more attractive than people who test negative! Although we are not likely to run to be eaten by our house-bound kitties, we may be more likely to change the litter box (or get more cats and become a crazy cat lady). So it looks like many of us are mind-hacked zombies too!

Want to know more? Check this out:

Kaushik, M., Knowles, S., & Webster, J. (2014). What Makes a Feline Fatal in Toxoplasma gondii's Fatal Feline Attraction? Infected Rats Choose Wild Cats Integrative and Comparative Biology, 54 (2), 118-128 DOI: 10.1093/icb/icu060

Monday, October 20, 2014

Caught in My Web: Creepy Animals, Animal Disguises, Pet-Love After Death, and Ebola

For this Halloween edition of Caught in My Web, we check out what the web has to say about creepy animal stories.


1. The CDC addresses questions about whether pets can get ebola

2. Julie Hecht, the author of Dog Spies at Scientific American blogs explores the love between dogs and their owners from beyond the grave

3. BuzzFeed presents 8 surprisingly creepy animals.



4. Dr. Doolittle at ScienceBlogs talks about the eyeless Mexican cavefish

5. Sara Mynott at Saltwater Science, a blog at Nature’s Scitable blog network, explains flounder disguises (they’re not just for Halloween)

Monday, October 13, 2014

Is That Lizard Possessed!? (A Guest Post)

By Tawny Liebe

Image from Chuck Heston on Flickr.
A creature straight from the depths of hell… or at least as close as you can get on this planet. The Texas horned lizard or “horny toad” is found in the deserts of the southwest United States and has an unusual adaptation to deter predation exclusively from a few species of canines. When threatened by coyotes, foxes, and dogs, the horned lizard squirts blood from its eyes to hit targets up to three feet away! A total of six species of horned lizard have been proven to respond this way to canine attack, while none have responded this way to other predators, such as the grasshopper mouse or the roadrunner. So what is the deal? How do they do this and how does it work as predator defense?

Veins have one-way valves
to prevent backflow.
Drawing by Tawny Liebe.

Before we get to that, there are a few things you need to know. First of all, the circulatory system includes a network of arteries and veins. Arteries carry blood full of oxygen to body tissues while veins carry blood that lacks oxygen from the rest of the body back to the heart. This means that for the blood, in someone’s foot for instance, to get all the way back to the heart through the veins, the blood must work against gravity. When you (or this lizard or many other species) move, blood is propelled from one chamber in the vein to the next until it reaches the heart. The blood is prevented from flowing back into the previous chamber by one-way valves, causing the blood to pool.

In order to squirt blood from their eyes, horned lizards manipulate the network of veins in their head so that they build up pressure, like a volcano getting ready to blow. By constricting a pair of throat muscles unique to reptiles, they effectively close their jugular veins and increase the blood pressure in their head. This is thought to be enhanced by another pair of muscles between the jugular veins and the eyes that help increase the blood pressure in the head even further, causing the blood to move into the sinuses of the eyes. The pressure continues to build until the blood breaks through the wall of the eye socket into the eyelids where it is forced into the tear duct and erupts like a Mentos in a Coke bottle all over whatever is chomping at the poor little lizard.

As if these lizards couldn’t get any more amazing, recent studies have shown that it is actually a compound in their blood that canines don’t like. Scientists have also found that this chemical is in their circulating blood, not just the blood that is squirted from their eye, rejecting an earlier hypothesis that the chemical is picked up in the tear duct. To top off all of this awesomeness, the chemical may be acquired through its main food source- harvester ants, which are venomous. These ants aren’t actually a requirement of the horned lizard’s diet and yet they are specialized to eat them. The horned lizard’s blood plasma binds to the venom, which neutralizes its toxicity and the resulting compound may be what deters these canines.

Now that we know how horned lizards are capable of this type of defense and how they most likely make their blood so undesirable, what is it about this chemical that is so appalling to these predators? It appears that the target area of the blood is the mouth since the horned lizard only squirts the blood when the canine begins to bite down on its head. This suggests that it may be the taste of the blood that prevents the horned lizard from becoming that coyote’s tasty snack.

The horned lizard’s ability to squirt blood at canines to prevent their untimely death is truly amazing and complex and there is still much to learn about it. Their ability makes me wonder how many other cool anti-predator adaptations there are out there in the animal and even the plant kingdom! Below is a video that will allow you to appreciate the full effect of this awesome defense strategy, enjoy!




References:

Heath, J.E. 1966. Venous shunts in the cephalic sinuses of horned lizards. Physiological Zoology 39(1): 30-35.Middendorf, G.A. and Sherbrooke, W.C. 1992. Canid elicitation of blood-squirting in a horned lizard (Phrynosoma cornutum). Copeia 1992(2): 519-527.

Middendorf, G.A. and Sherbrooke, W.C. 1992. Canid elicitation of blood-squirting in a horned lizard (Phrynosoma cornutum). Copeia 1992(2): 519-527.

Middendorf, G.A. et. al. 2001. Comparison of blood squirted from the circumorbital sinus and systemic blood in a horned lizard, Phyrnosoma cornutum. The Southwestern Naturalist 46(3): 384-387.

Middendorf, G.A. and Sherbrooke, W.C. 2004. Responses of kit foxes (Vulpes macrotis) to antipredator blood-squirting and blood of Texas horned lizards (Phrynosoma cornutum). Copeia 2004(3): 652-658.

Sherbrooke, W.C. 1992. Chiricahua Mountains Research Symposium. Horny “toad” tales from the Chiricahua mountains as, told by a biologist. Southwest Parks and Monuments Association, Tuscon, AZ. 78-80.