How does the struggle between sexual selection and natural selection drive the coloration of a tropical gecko?

Universidad de los Andes
Colombia
BiologyEcology
DOI: 10.18258/13199
$3,302
Raised of $3,300 Goal
100%
Funded on 6/12/19
Successfully Funded
  • $3,302
    pledged
  • 100%
    funded
  • Funded
    on 6/12/19

About This Project

On animal coloration, sexual selection may promote conspicuousness while natural selection may favor crypsis. We will test the hypothesis that this conflict between evolutionary pressures drives the coloration of Gonatodes caudiscutatus, a species of small gecko occurring in coastal Ecuador and the Galapagos islands. We hypothesize that along its distribution, G. caudiscutatus will be submitted to different levels of predation pressure and its levels of conspicuity will vary accordingly.

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What is the context of this research?

Natural selection favors traits that are advantageous for the survival of individuals in their environment. Sexual selection favors traits which enhance reproduction despite being costly to produce and frequently detrimental to the survival of the bearer of the trait. Natural selection may favor cryptic colors to reduce predation risk, but more conspicuous and ornamented males might be favored by sexual selection.

Settings where predatory pressure varies geographically are ideal natural experiments to examine how tradeoffs between natural and sexual selection affect the evolution of coloration in different populations. Comparisons between continental and insular populations may be especially revealing due to the impoverished predator assemblages in islands.

What is the significance of this project?

Understanding the roles of natural and sexual selection driving evolutionary change is a central research topic in evolution. Gonatodes caudiscutatus is a diurnal gecko living in a wide range of habitats varying in vegetation and soil type, providing a unique opportunity to study whether organisms have evolved locally by natural selection to match the coloration of their environment to avoid predators. This gecko is endemic to coastal Ecuador, but it was introduced to the Galapagos Islands in the 19th century. This introduction beyond the native range of the species further allows one to examine whether depauperate predator assemblages in an insular setting have resulted in evolution of coloration driven by sexual selection where predation pressures are relaxed.

What are the goals of the project?

To determine if predators may have an effect on the evolution of coloration, we will non-invasively measure predatory pressure using paraffin models across the range of G. caudiscutatus. We will then examine whether predation pressure relates to variables describing conspicuousness such us color brilliance, color contrast of geckos and their environment and color pattern shape and size, using reflectance spectrophotometry and digital photography analysis software. We predict that gecko coloration will contrast more with the environment in areas with lower predation pressure. If our hypothesis is supported, then conspicuousness should be greatest in the islands, where we expect predation to be low and thus effects of sexual selection to override the influence of natural selection.



Budget

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This funding will help us: (1) build 900 paraffin gecko models to experimentally measure predatory pressure (2) take models to the field and measure how often they are attacked in different locations, giving us an idea of the level of predatory pressure each gecko population is under; (3) cover some travel expenses to visit … localities across the Pacific lowlands and western Andean slopes of Ecuador, and on one of the islands in the Galapagos archipelago (San Cristobal island). There, we will measure the coloration and color patterns of as many individuals as we can find; and, (4) get the lab supplies needed to extract and amplify 3 mitochondrial genes from at least 80 geckos, and to sequence these genes to analyze the phylogenetic relationships among populations.

Endorsed by

Mateo is a sharp and highly motivated student. This project explores how the color of a neotropical gecko species can be the result of antagonistic evolutionary forces. This study not only will provide important insights in the evolution of color, but also, will provide important biogeographic information that rarely is available in the neotropics.

Flag iconProject Timeline

All fieldwork will be carried out between June and September 2019, spending at least 15 days at each of 8 continental and 2 insular localities to collect color and predation pressure data. From September 1st until December 2019 we will be working in the molecular lab, extracting, amplifying and sequencing genes that we will use to determine genetic structure amongst populations. Finally, from mid-December until April 2020 we will be analyzing the data and writing the first draft of our findings.

May 13, 2019

Project Launched

Jun 15, 2019

Travel to San Cristobal in the Galapagos archipelago

Jul 15, 2019

Travel to the northern provinces of Ecuador

Jul 17, 2019

Post pictures from insular geckos in this platform

Jul 30, 2019

Travel to the central provinces of Ecuador

Meet the Team

Mateo Davila
Mateo Davila

Affiliates

Universidad San Francisco de Quito, Universidad De los Andes
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Lía Altamirano Ponce
Lía Altamirano Ponce
Diego F. Cisneros-Heredia
Diego F. Cisneros-Heredia
Doctor

Affiliates

Universidad San Francisco de Quito USFQ
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Daniel Cadena
Daniel Cadena
Maria de Lourdes Torres
Maria de Lourdes Torres

Team Bio

Our team unites experienced researchers in the field of evolution and ecology from Universidad de los Andes in Colombia and Universidad San Francisco de Quito with promising undergrad and Master’s students at these institutions with a passion for understanding big questions and for working in the field.


Mateo Davila

Since I was a kid I was fascinated by biology and ecology, constantly fascinated by the different shapes and adaptations organisms had to adapt to their environments.

As an undergrad student at universidad San Francisco de Quito, in Ecuador, I started to understand and fell in love with the evolutionary process and this amazing theory that explained why organisms are the way they are.

I am currently doing my master's degree at universidad De los Andes in Colombia, working on

evolutionary ecology, and trying to understand how different evolutionary pressures in an environment interact to shape the living organisms in it.

Lía Altamirano Ponce

Choosing a career was very difficult for me, but when I finally started studying biology at my university I found out that it allows me to answer many of the questions I have about the world that surrounds us, and I fell in love with every part of it.

I believe that only when we humans understand the connection we have with nature we will start taking care of it as it deserves. The study of evolution enables us to understand these connections, and the different evolutionary paths that have given rise to the numerous species that we know today. Also, this allow us to predict how life could have evolved under determined conditions, and we can hypothesize about how life in other planets could be, which is one of my biggest wonders.

I am currently working on my undergraduate degree in biology at Universidad San Francisco de Quito and I decided to study evolution from a molecular perspective with this gecko.

Diego F. Cisneros-Heredia

Naturalist and researcher. I am passionate about studying the diversity and natural history of species, the factors underlying their patterns of distribution, their shared biogeographic history, and the effects of human activities on species and their habitats, in order to support its long-term conservation. My research has a special emphasis on terrestrial animals, in particular amphibians, reptiles, birds, and spiders (herpetology, ornithology, arachnology). Currently, I am full-time professor at Universidad San Francisco de Quito USFQ, where I am director of the Laboratory of Terrestrial Zoology and Coordinator of Biology.

Daniel Cadena

I am a professor in the Departamento de Ciencias Biológicas at Universidad de los Andes in Bogotá, Colombia. I am broadly interested in the evolution, systematics and evolutionary ecology of vertebrates, with a special focus on Neotropical birds. My research cuts across different ecological, temporal and spatial scales to address evolutionary questions, with studies ranging from genetic, mechanistic and behavioral approaches to understanding adaptation of organisms to their environment, to the role that large-scale evolutionary processes play in establishing spatial patterns of species richness. Main research areas in my lab currently focus on (1) natural selection and adaptation of organismal traits to varying environments and the link between adaptation and speciation along elevational and other environmental gradients, (2) the ecology and evolution of avian migration, (3) comparative phylogeography as a tool to understand the history of Neotropical diversification, and (4) the link between evolutionary/historical processes of speciation, extinction and immigration, and the structure of ecological assemblages and spatial patterns of species diversity.

I am excited about this research project, which will allow us to address central questions in evolution while training students and forging collaborations for research and education with our colleagues in Ecuador.

Additional Information



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  • 100%Funded
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