Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America

In marine turtles, sex is determined during a precise period during incubation: males are produced at lower temperatures and females at higher temperatures, a phenomenon called temperature-dependent sex determination. Nest temperature depends on many factors, including solar radiation. Albedo is the...

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Autores principales:	Alejandra Morales Mérida, Aude Helier, Adriana A. Cortés-Gómez, Marc Girondot
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	temperature-dependent sex determination hatching success albedo <i>Lepidochelys olivacea</i> olive ridley sea turtle Veterinary medicine SF600-1100 Zoology QL1-991
Acceso en línea:	https://doaj.org/article/eb60afd7c79049e28daf78b7f7c78315
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spelling	oai:doaj.org-article:eb60afd7c79049e28daf78b7f7c783152021-11-25T16:17:52ZHatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America10.3390/ani111131682076-2615https://doaj.org/article/eb60afd7c79049e28daf78b7f7c783152021-11-01T00:00:00Zhttps://www.mdpi.com/2076-2615/11/11/3168https://doaj.org/toc/2076-2615In marine turtles, sex is determined during a precise period during incubation: males are produced at lower temperatures and females at higher temperatures, a phenomenon called temperature-dependent sex determination. Nest temperature depends on many factors, including solar radiation. Albedo is the measure of the proportion of reflected solar radiation, and in terms of sand color, black sand absorbs the most energy, while white sand reflects more solar radiation. Based on this observation, darker sand beaches with higher temperatures should produce more females. As marine turtles show a high degree of philopatry, including natal homing, dark beaches should also produce more female hatchlings that return to nest when mature. When sand color is heterogeneous in a region, we hypothesize that darker beaches would have the most nests. Nevertheless, the high incubation temperature on beaches with a low albedo may result in low hatching success. Using Google Earth images and the SWOT database of nesting olive ridleys (<i>Lepidochelys olivacea</i>) in the Pacific coast of Mexico and Central America, we modeled sand color and nesting activity to test the hypothesis that darker beaches host larger concentrations of females because of feminization on darker beaches and female philopatry. We found the opposite result: the lower hatching success at beaches with a lower albedo could be the main driver of nesting activity heterogeneity for olive ridleys in Central America.Alejandra Morales MéridaAude HelierAdriana A. Cortés-GómezMarc GirondotMDPI AGarticletemperature-dependent sex determinationhatching successalbedo<i>Lepidochelys olivacea</i>olive ridleysea turtleVeterinary medicineSF600-1100ZoologyQL1-991ENAnimals, Vol 11, Iss 3168, p 3168 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	temperature-dependent sex determination hatching success albedo <i>Lepidochelys olivacea</i> olive ridley sea turtle Veterinary medicine SF600-1100 Zoology QL1-991
spellingShingle	temperature-dependent sex determination hatching success albedo <i>Lepidochelys olivacea</i> olive ridley sea turtle Veterinary medicine SF600-1100 Zoology QL1-991 Alejandra Morales Mérida Aude Helier Adriana A. Cortés-Gómez Marc Girondot Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
description	In marine turtles, sex is determined during a precise period during incubation: males are produced at lower temperatures and females at higher temperatures, a phenomenon called temperature-dependent sex determination. Nest temperature depends on many factors, including solar radiation. Albedo is the measure of the proportion of reflected solar radiation, and in terms of sand color, black sand absorbs the most energy, while white sand reflects more solar radiation. Based on this observation, darker sand beaches with higher temperatures should produce more females. As marine turtles show a high degree of philopatry, including natal homing, dark beaches should also produce more female hatchlings that return to nest when mature. When sand color is heterogeneous in a region, we hypothesize that darker beaches would have the most nests. Nevertheless, the high incubation temperature on beaches with a low albedo may result in low hatching success. Using Google Earth images and the SWOT database of nesting olive ridleys (<i>Lepidochelys olivacea</i>) in the Pacific coast of Mexico and Central America, we modeled sand color and nesting activity to test the hypothesis that darker beaches host larger concentrations of females because of feminization on darker beaches and female philopatry. We found the opposite result: the lower hatching success at beaches with a lower albedo could be the main driver of nesting activity heterogeneity for olive ridleys in Central America.
format	article
author	Alejandra Morales Mérida Aude Helier Adriana A. Cortés-Gómez Marc Girondot
author_facet	Alejandra Morales Mérida Aude Helier Adriana A. Cortés-Gómez Marc Girondot
author_sort	Alejandra Morales Mérida
title	Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
title_short	Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
title_full	Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
title_fullStr	Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
title_full_unstemmed	Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America
title_sort	hatching success rather than temperature-dependent sex determination as the main driver of olive ridley (<i>lepidochelys olivacea</i>) nesting activity in the pacific coast of central america
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/eb60afd7c79049e28daf78b7f7c78315
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Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (<i>Lepidochelys olivacea</i>) Nesting Activity in the Pacific Coast of Central America

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