Behaviour 2019
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No evidence for size-assortative mating in the wild in the Emerald Glass Frog, Espadarana prosoblepon
Johana Goyes Vallejos1, Johniah Gomez2, Abner D. Hernández-Figueroa3, Rebecca Vera4, David M. Green 5. 1Division of Biological Sciences, University of Missouri, Columbia, Missouri, United States; 2University of Rhode Island, Kingston, Rhode Island, United States; 3Environmental Sciences Department, University of Puerto Rico – Rio Piedras, San Juan de Puerto Rico, Puerto Rico, United States; 4Department of Biology and Physical Sciences, Passaic County Community College, Patterson, New Jersey, United States; 5Redpath Museum, McGill University, Montreal, Quebec, Canada

Size assortative mating (SAM) is a pattern of non-random pairing among individuals that has been presumed to arise due to the enhanced reproductive success that may accrue from mating with an individual of similar size. The hallmark for the existence of size assortative mating is a significant correlation between female and male body sizes in mated pairs. We investigated the mating pattern of the Emerald Glass Frog, Espadarana prosoblepon, whose mating system allows abundant opportunity for female choice and therefore is an opportune study system for testing SAM hypotheses. We tested whether E. prosoblepon males found in amplexus were larger than solitary males, and whether either larger males or size-matched pairs of frogs had a higher proportion of their eggs fertilized. We found no evidence for any of these relationships. Males in amplexus were not larger than unmated males and male size did not predict the proportion of fertilized eggs. Our results indicate that the mating pattern of E. prosoblepon is random with respective to body size and adds to the growing body of evidence that body size does not influence mating patterns in anurans as much as previously thought.