Monthly Archives: June 2014

The third and final day at Biology of the Pitvipers

I am sad to day that Biology of the Pitvipers is over.  I can honestly say that the Conference ended as it began, with a day filled with great pitviper talks!  We started the morning with a group picture.  If you haven’t yet requested your group photo you can do that here.  We started teh morning with a four talks on pitviper “-omics.”  This is admittedly not my area so I can’t say for certainty if the talks were venomics, genomics, or transcriptomics.  I can say his is a really cool area of research with a lot of potential to improve the human condition.  Through the work of guys like Ken Wray and Darin Rokyta we are learning the genes responsible for venom production have been around a long time in a lot of other places (livers, pancreas, heart, intestines), but are being recruited and duplicated by snakes to produce venom in the venom glands.

After a break for milk and cookies (no joke!) we saw a talk by Emily Taylor of Cal Poly about translocation and stress in Red daimond rattlesnakes.  Emily’s talk was followed by a neat biogeorgraphy talk looking at variation in scalation and body size in relation to elevation .  George Bakken blew everyone away with a talk about the physics of thermal imaging.  Pitvipers are able to see heat images stereoscopically, and George adn Aaron Krockmal have worked out much of the physics of that system. These talks were followed up by talks about the phylogenesis of diet and microbial ecology of the gut fauna of pitvipers.

The afternoon was dedicated to studies on movement and the natural history of feeding and reproduction.  Warren Booth et al. work on parthenogenesis  is pretty freaking cool.

The final four talks of the day were about phylogenetics of pitvipers, strike kinematics and photography of rattlesnakes.  I hate to short change the end of the day.  These were great talks, but I have to get checked out the hotel.  I am meeting on of the most influential rattlesnake biologists of the late 20th century for lunch.


Day Two at Biology of the Pitvipers Conference

This post will not do the day justice, but here goes, anyway…

 

Day two at Biology of the  Pitvipers was mostly about  demography, biogeography, venom, and translocation.   Steve Mackessy started the morning with a keynote address on the state of the art of venom research.  if you are not familiar with Steve’s work you need to be.  He is truly an integrative biologist who utilizes cutting edge biochemistry techniques and old school natural history to understand not just snake venom, but the ecology of venomous snakes.

Following Steve’s keynote, Bill Brown presented demographic data he has been collecting on Timber rattlesnakes of New York for the past three decades.  His is an amazing data set that includes a 45 year old individual!    Dan Beck gave a talk on a couple of populations of Crotalus oreganus and Matt Goode talked about his decade long study on urban Tiger rattlesnakes.

Timber rattlesnake coiled among leaves.

Timber rattlesnake coiled among leaves.

 

There were a couple of great talks on pitviper biogeography given by Mike Douglas and Allison Fenwick. Dr. Douglas’ talk centered on the impact global climate change will have on montane species of rattlesnakes and Dr, Fenwick discussed biogeographic hypotheses for explaining the current distribution of South American Pitvipers.

 

Chuck Smith of the Copperhead institute gave a talk on sexual selection in Copperheads.  There were a number of interesting talks on the ecological significance of rattlesnake venoms and venom components.  The venom talks were followed by talks by a number of people interested in the value of translocation as a management strategy for nuisance rattlesnakes.    Noteworthy among these were Erica Nowak’s talk covering the pros and cons of translocation and Jeff Mohr’s talk on the potential utility of the technique in Timber rattlesnakes of South Carolina.  The final talks of the day were about advances in radiotelemetry surgical implantation procedures by Dr. Thompson.

Following the sessions everyone attended a BBQ with killer food and a behind the scenes tour of the reptile/amphibian building at the Tulsa Zoo.  The Biologyof the Pitvipers meeting continues to be everything I expected it to be.


Day one at Biology of the Pitvipers

As expected, day one at the Biology of Pitvipers conferences was not a disappointment.  The keynote address “A Long View of Pitvipers: Past and Present,” by Harry Greene was great.  He talked a bit about about the morphology of snake jaws and how snake eat such large meals, then discusses the ancient and fascinating coevolutionary relationship between snakes and primates.  He concluded his talk by highlighting how scientists and snake enthusiasts can inspire appreciation for pitvipers.

The rest of the day was devoted to devoted to talks about snake behavior, venom, education, pitvipers in a cultural context.  I cannot summarize all of the fantastic talks from yesterday, but i can give a couple of highlights.  The Talk by Terry Farrell of Stetson University on the feeding behavior of Pigmy rattlesnakes  had some great video clips of pigmy rattlesnakes depradating on centipedes and skinks.  Theses snakes vary they feeding behavior based on prey type.    Cool stuff.  Bill Hayes of Loma Linda University gave a neat talk linking specific venom components to specific symptoms experienced by snakebite victims.Melissa Amarello of Advocates for Snake Preservation (Yeah, ASP) gave a great talk telling us about their great new advocacy and outreach group.  If you are a snake nut, you need to join this group!  The last talk of the day was by Aaron Krochmal, Travis LaDuc, and myself about the last 25 years of pitviper research.  I gotta say Krockmal gives a good talk.  We highlighted the value of the venom research and stressed the importance for more natural history related work.  Less than 10% of the current research on pitvipers (which are distributed from southeast Asia through North, Central,and South America) is on ecology, morphology, and behavior.

 

The day ended with a poster session.  I lament to say I spent the entire poster session standing near my posters discussing my current work on rattle fluorescence and operant conditioning in rattlesnakes.  A quick burn around the room though suggested that posters ran the gamut from thermal physiology to population genetics, to education and conservation.

I have no doubt that today’s talks will as enlightening as yesterdays.  I’ll keep you posted.


An experiment in scientific discourse: Fluorescence of the rattlesnake rattle

I get the sense that many people feel as if science and scientists are in an ivory tower; that science is out of reach of most people because they don’t have the educational background or the quantitative skills typified by professional scientists.  I think also that sometimes scientists disregard the ideas of non-scientists because they don’t have the educational background or quantitative skills most scientists have.  I think that both of these notions are mistaken.

Science is a community endeavor.  It benefits form discourse; the tossing around of ideas and interpretations by multiple people from many different backgrounds.  Whether we admit it or not, all humans are bias.  Our thought processes and interpretations of the natural world are the result of our prior experiences.   Hence, science benefits from many different people eyeing up the same problems because what one person may see as an intractable problem or routine observation is seen as an easily solved problem or extraordinary phenomenon.

In an attempt to engage a wide community of people, both professional and non-professional in the human endeavor called science, below I describe a research project I am currently working on related to the ultraviolet fluorescence of the rattlesnake rattle.  I will be presenting a poster of this very project a the 2nd Biology of the Pitvipers meeting in a few days.  After the description, I provide a short URL to a form where you can leave your comments and suggestions about the scientific process in general and the fluorescence project, specifically.  I ask that you use the URL instead of the comments section of this blog so that I have everyone’s comments in one place in a user-friendly format.

Ultraviolet Fluorescence of the Rattlesnake Rattle: Preliminary findings

All animals communicate within their own species and between species. For example honey bees do the waggle dance to tell other bees in which direction and how far to a plentiful food source.  Rattlesnakes advertise their potentially harmful bite by rattling the rattle on their tail.  Essentially, communication is the transfer of information from a sender to a receiver in which both parties benefit from the information exchange.  In many cases it is helpful to send information in more than one sensory channel.  For example some rattlesnakes use an auditory signal and a visual signal (some rattlesnakes have a conspicuously colored tail).

Fluorescence is a physical phenomenon in which light is emitted when the electrons of a substance are excited and change energy levels, whereby in the process photons are released.  The late, great rattlesnake biologist Laurence Klauber noted over 50 years ago that the rattlesnake rattle fluorescences under ultraviolet light.  No one has investigated the phenomenon since even though it is known that other animals utilize UV fluorescence, including parrots, many fish, and scorpions.Diversity_of_fluorescent_patterns_and_colors_in_marine_fishes_-_journal.pone.0083259.g001.png (1620×2741)

Our study had three objectives:  1) Develop methods to quantitatively  assess rattle fluorescence, 2) Document interspecific variation in rattle fluorescence, if it exists, and 3) Test hypotheses regarding the function and biological role of rattle fluorescence.

To meet these objective we built a 3×3 UV-LED (395-400 nm) light array in a black box and photographed rattlesnake rattles.  We utilized western diamondback and prairie rattlesnakes from the Northwestern Oklahoma State University Museum of Natural History.  We then quantified the intensity of the fluorescence using computer software similar to Photoshop.

We found that Western diamondback rattlesnakes exhibit more intense fluorescence than prairie rattlesnakes.

Rattlesnake rattles fluorescing under Ultraviolet light.

Rattlesnake rattles fluorescing under Ultraviolet light.

We have come up with a few ideas about why this might be.  First, it is possible that the fluorescence is a signal enhancer (that is how humans use fluorescence; that’s what Woolite and Tide do do to your clothes).  We thought this might be related to differences in habitat use or activity in these species, but they use very similar habitats (at least in Oklahoma) and both are active at night (there is available UV at night, however).  It is interesting to note that the Western diamondback has a banded tail which is also conspicuous.

Another possibility is that the fluorescence enhances the mimetic similarity between the rattle and segmented insects.  Several species of rattlesnakes exhibit a behavior called caudal luring in which they wiggle their tails to lure food within striking distance.  The video at this link is of copperheads luring, which are close relatives to rattlesnakes.

So, now is your chance to think like a scientist.  Follow the link below to a Google form that will provide you an opportunity to record your thoughts on this research.

 

The form can be found here:  http://goo.gl/vmGiXU

 


%d bloggers like this: