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Presentation Title: Male-male Aggressive Interactions in the Emerald Glass Frog (Espadarana prosoblepon) Discipline: Ecology and Evolutionary Biology School: University of Colorado at Boulder Presentation Type: Oral Presentation Abstract: Male-male Aggressive Interactions in the Emerald Glass Frog (Espadarana prosoblepon) 1 2 Hayden Hedman University of Colorado at Boulder, Dr. Myra Hughey Smithsonian Tropical Research Institute

Determining the factors influencing the outcome of male-male aggressive interactions increases our understanding of their likelihood of achieving reproductive success. Male-male aggressive behavior in the emerald glass frog (Espadarana prosoblepon) and its underlying causes were studied at Las Cruces Biological Station, Costa Rica, during July 2011. Male E. prosoblepon have a structure called a humeral hook, which is a bony spine projecting from the humerus, which may act as a weapon during male-male combat. In this study, we (1) surveyed male abundance nightly for approximately 3 weeks, (2) quantified variation in male body size and humeral hook size, and (3) assessed fighting behavior of males placed in an experimental arena. We investigated how size of the humeral hook and male body size influenced the outcome of aggressive interactions. Male abundance varied nightly, as did the likelihood that males placed together would fight. Aggressive interactions ranged from calling to extended wrestling bouts. Male abundance and fighting may be correlated with daily weather patterns. Male body size and the size of the humeral spine varied considerably between individuals; however, additional data are needed to understand the relationship between these traits and fighting ability. This research is pertinent for understanding the influence of male traits on the reproductive success of E. prosoblepon and its overall natural history.

Key words: Anura, Sexual secondary characteristics, male-male combat, humeral spine

Presenter: Hayden Hedman Tribe: Cherokee Nation Primary Email: hayden.hedman@colorado.edu Biography Hayden Hedman is a junior studying ecology and evolutionary biology at University of Colorado at Boulder. His interests vary from hiking, punk concerts, and playing with his turtles. Hayden’s interest in ecology has sent him all over the Caribbean and recently, Costa Rica. Hayden was a member of the 2011 Native American and Pacific Islander Research Experience (NAPIRE). The program not only offered Hayden the opportunity to study amphibian behavior but also visit indigenous territories. As a Native ecologist, Hayden aspires to decrease the gap between ecological research and indigenous communities.

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2011 National Conference Student Research Abstracts  

A comprehensive list of the student research topics that will be presented at the AISES 2011 National Conference

2011 National Conference Student Research Abstracts  

A comprehensive list of the student research topics that will be presented at the AISES 2011 National Conference

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