Abstract
Parental hydration of terrestrially developing eggs has evolved repeatedly among frogs and is thought to buffer embryos from environmental variation. While many anurans offer relevant opportunities to study parental care, research on how parents respond to environmental variation and offspring conditions are lacking. In this study, we investigated the interrelationships of weather, embryo hydration demands, and parental provisioning in a wild population of the glassfrog Hyalinobatrachium (‘Centrolenella’) fleischmanni in Oaxaca, Mexico. We determined whether males modify parental behavior in response to changes in weather conditions that effect embryo dehydration, how variation in both weather and parental hydration affect egg water balance and embryonic mortality, and whether parental provisioning is related to the hydration levels of egg clutches. We found that male H. fleischmanni compensate for environmental variation in offspring conditions by adjusting the frequency of parental care in response to both weather and egg dehydration. Using a male removal experiment, we examined the function of paternal care and made comparisons with previous research, finding that both the adaptive value of parental care and flexibility in parental behavior are impacted by spatial and temporal conditions. We present observations that indicate a direct conflict between providing parental care and multiple matings. In summary, this research demonstrates that the variable frequency of paternal care in H. fleischmanni is a response to the fluctuating nature of the climate and resulting hydration requirements of embryos in combination with the allocation of effort to parental care versus mating activity.
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Acknowledgments
We are forever indebted to the family of Rogelio Cortéz-Rojas and Eloisa Escobar-Cortéz, and the people of San Gabriel Mixtepec for opening up their community, providing access to field sites, friendship, and chelas while working in the Mexican Sierra. We sincerely acknowledge all the thoughtful comments, suggestions, and critical review of methods, analyses, and/ or versions of this manuscript by R.W. McDiarmid, D.R. Chalcraft, T. Lamb, K.M. Warkentin, E. Twomey, M.P. Hayes, J.C. Touchon, P. Buston, K.L. Cohen, J. Majoris, and two anonymous reviewers. Funding was provided by Grant-In-Aid of Research from the National Academy of Science administered by Sigma Xi (The Scientific Research Society), the American Society of Ichthyologists and Herpetologists Gaige Fund Award, and the Next-Step Scholarship (East Carolina University). Permits were provided by the Secretaria de Medio Ambiente y Recursos Naturals (SEMERNAT).
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This research was conducted in compliance with current laws and protocols of the United Mexican States. Research was approved and permits were provided by the Secretaria de Medio Ambiente y Recursos Naturals (SEMERNAT permit numbers: 01903, 01902, 09280).
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The authors declare that they have no conflict of interest.
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Communicated by J. Christensen-Dalsgaard
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Delia, J.R.J., Ramírez-Bautista, A. & Summers, K. Parents adjust care in response to weather conditions and egg dehydration in a Neotropical glassfrog. Behav Ecol Sociobiol 67, 557–569 (2013). https://doi.org/10.1007/s00265-013-1475-z
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DOI: https://doi.org/10.1007/s00265-013-1475-z