Tag: thermoregulation

Seeking Support for New Research Investigating Color Change in Green Anoles

Victoria Pagano’s page from the crowd-funding platform Experiment

Green anoles (Anolis carolinensis) are talked about quite frequently here on Anole Annals, with 11 articles being published in 2018 and 2019 combined! As I am sure many of you are aware, green anoles change color from green to brown, and while it is known how, it is not yet known why. Although there have been multiple field studies into what causes green anoles to change color, the data have been inconclusive. This is why an experimental study is necessary to try to determine the cause of the color change.

In this experimental study, there will be two main hypotheses tested:

The first is the well known thermoregulation hypothesis. I will be testing this by establishing separate light and heat sources, and turning them on and off for different scenarios. If anoles change color for thermoregulation, then they would turn brown more frequently when the heat is off and the light is on.

The second hypothesis is the effect of increased stress. Stress will be induced by sliding a red disk towards the anoles multiple times at a high speed. Any color change that occurs within the red disk moving and the following 10 minutes will be documented as stress-induced.

I will not be able to test the advertisement signaling hypothesis due to feasibility. Because funding and space is limited, I do not have the capacity to house male anoles, as each one needs his own setup. Therefore, testing only females is the only feasible option, and by doing so, the advertisement signaling hypothesis will not be able to be tested, as this hypothesis pertains mainly to males.

To raise funding for this project, I am using an all or nothing crowdfunding platform called Experiment. As fellow anole lovers, I hope that you can help support my scientific endeavors by visiting my project page. All forms of support are greatly appreciated, from donations, to telling your friends about the project, or even by just reading my project page and commenting your thoughts! Whatever the contribution, I am very grateful, and am simply excited to be able to share what I am doing with all of you!

If you wish to learn more about this project, you can visit the project page, “What drives the color change in green anoles?”, where I have posted my methodology, protocols, and will be posting continuous updates on the progression of the project. If you become a contributor, you will have exclusive access to more updates, and will be able to learn more about the research.

My project page stops accepting donations on November 1st at 12:00 AM PT, so be sure to make your way over to the page by then to give your support!

Thank you for taking the time to read this article. I hope that you will explore the project page, and help support this cool and unique research!

Thermal Ecology of Anolis cristatellus

The recent literature has been full of doom and gloom regarding the prospects for lizard survival in the face of global climate change (e.g., Sinervo et al. 2010).  A talk by Alex Gunderson from Manuel Leal’s lab at Duke University provided some important new insights on how our favorite lizards are likely to weather this storm.  Gunderson investigated thermal ecology of Anolis cristatellus at nine localities, including four mesic and five xeric locales.  His data included thousands of field collected temperature records from live animals and copper models as well as data on preferred body temperature and sprint speed performance across a range of temperatures.  Temperature data from live animals and co-distributed copper models showed that the xeric, but not the mesic, populations are behavioral thermoregulators that tend to be found in cooler spots than the randomly placed copper models.  Even with the benefit of behavioral thermoregulation, the xeric forest lizards were consistently active at temperatures that exceeded their preferred body temperature.  When Gunderson integrated these findings with data on sprint speed performance and climate change, he found that the xeric forest animals are likely to suffer significant reductions in performance associated with climate change.  Gunderson ended with a teaser by showing that he has accumulated comparable data on performance across a range of temperatures for all the other Puerto Rican anoles.  Next year’s talk should be a blockbuster!

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