Strong male‐biased operational sex ratio in a breeding population of loggerhead turtles (<i>Caretta caretta</i>) inferred by paternal genotype reconstruction analysis

Ecology and Evolution - Tập 3 Số 14 - Trang 4736-4747 - 2013
Jacob A. Lasala1,2, J. Scott Harrison2, Kristina Williams3, David C. Rostal2
1Department of Biology Florida Atlantic University 777 Glades Road Boca Raton Florida 33431
2Department of Biology Georgia Southern University BIOSC 9999 4324 Old Register Road Statesboro Georgia 30460
3Caretta Research Project P.O. Box 9841 Savannah Georgia 31412

Tóm tắt

AbstractCharacterization of a species mating systems is fundamental for understanding the natural history and evolution of that species. Polyandry can result in the multiple paternity of progeny arrays. The only previous study of the loggerhead turtle (Caretta caretta) in the USA showed that within the large peninsular Florida subpopulation, multiple paternity occurs in approximately 30% of clutches. Our study tested clutches from the smaller northern subpopulation for the presence of multiple paternal contributions. We examined mothers and up to 20 offspring from 19.5% of clutches laid across three nesting seasons (2008–2010) on the small nesting beach on Wassaw Island, Georgia, USA. We found that 75% of clutches sampled had multiple fathers with an average of 2.65 fathers per nest (1–7 fathers found). The average number of fathers per clutch varied among years and increased with female size. There was no relationship between number of fathers and hatching success. Finally, we found 195 individual paternal genotypes and determined that each male contributed to no more than a single clutch over the 3‐year sampling period. Together these results suggest that the operational sex ratio is male‐biased at this site.

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Ecology and Evolution

Tập 3 Số 14

4736-4747

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