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Anole Morphology Sheds Light on How Invasive Species Adapt

Invasive maynard’s anole populations in the Cayman Islands give us clues as to how invasive species readily adapt to new environments.

Often times what makes an invasive species particularly threatening in a new environment is their ability to adapt to their surroundings. Researchers at the University of Plymouth wanted to understand exactly what characteristics if any, an invasive anole in the Cayman Islands has that made it so quick to adapt. To understand this process, researchers sought to uncover how the morphology of an invasive anole changed in a new environment.

maynard's anole morphology cayman islands
Endemic Desecheo Anole. Credit: Island Conservation

The lizard population in question is the invasive maynard’s anole (Anolis maynardi) which migrated in the mid-1980s from its native territory of Little Cayman to the island of Cayman Brac. A native population of anole also exists on Cayman Brac. The researchers discovered the two species had diverged morphologically from each other. Meaning each species had adapted unique characteristics that allow them to specialize in different ways to acquire resources on the island. Specifically, the invasive anole trended towards an increase in forelimb length. However, researchers expected to see an increase in hindlimb length, not forelimb: 

A Brown Anole, native to Cayman Brac. Credit: Rusty Clark ~ 100k

There has been a history of lizard studies indicating that longer hindlimbs are an important factor affecting movement ability, so to not find longer hind limbed animals on the range edge was a surprise.”

Not only this, the native anole found on the island had a greater parasite prevalence and a lesser overall body condition than the invasive population. In other words, the invasive population on the island tended to be healthier overall.  

The study highlights the ways invasive species adapt their behavior and characteristics in order to successfully take hold within a population. This emerging research should also function as a call to action for improved bio-security measures which can assist with mitigating introductions moving forward. 

Source: Science Daily
Featured Photo: A Brown Anole, native to Cayman Brac.
Credit: Jill Bazeley

About Stephanie Dittrich

Stephanie Dittrich is a current senior in Environmental Studies at UC Santa Cruz and a transfer student from De Anza College. She is also currently pursuing a Certificate of Achievement in Geospatial Technologies and a second Associates Degree in Graphic Design from Foothill College. She has worked in multiple marketing and design focused roles at environmental nonprofits as well as the Genomics Institute at UC Santa Cruz. She just finished spending 3 months in Costa Rica conducting field work where she did an independent research project and wrote a scientific paper about flight response time in the Morpho peleides butterfly. In her spare time, Stephanie enjoys working on creative photography and design projects, often centered around wildlife photography, as well as more experimental and contemporary subject matter.

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