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Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change

Jacques-Olivier Laloë, Nicole Esteban Orcid Logo, Jessica Berkel, Graeme C. Hays

Journal of Experimental Marine Biology and Ecology, Volume: 474, Pages: 92 - 99

Swansea University Author: Nicole Esteban Orcid Logo

DOI (Published version): 10.1016/j.jembe.2015.09.015

Abstract

Sand temperatures at nest depths and implications for hatchling sex ratios of hawksbill turtles (Eretmochelys imbricata) and green turtles (Chelonia mydas) nesting in the Chagos Archipelago, Indian Ocean are reported and compared to similar measurements at rookeries in the Atlantic and Caribbean. Du...

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Published in: Journal of Experimental Marine Biology and Ecology
Published: 2016
URI: https://cronfa.swan.ac.uk/Record/cronfa23842
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first_indexed 2015-10-18T04:30:02Z
last_indexed 2019-07-17T20:24:00Z
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spelling 2019-07-17T17:48:56.1667700 v2 23842 2015-10-17 Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change fb2e760b83b4580e7445092982f1f319 0000-0003-4693-7221 Nicole Esteban Nicole Esteban true false 2015-10-17 SBI Sand temperatures at nest depths and implications for hatchling sex ratios of hawksbill turtles (Eretmochelys imbricata) and green turtles (Chelonia mydas) nesting in the Chagos Archipelago, Indian Ocean are reported and compared to similar measurements at rookeries in the Atlantic and Caribbean. During 2012-2014, temperature loggers were buried at depths and in beach zones representative of turtle nesting sites. Data collected for 12,546 days revealed seasonal and spatial patterns of sand temperature. Depth effects were minimal, perhaps modulated by shade from vegetation. Coolest and warmest temperatures were recorded in the more shaded sites during the austral winter and in more open sites during summer respectively. Overall, sand temperatures were relatively cool during the nesting seasons of both species which would likely produce fairly balanced hatchling sex ratios of 53% and 63% male hatchlings, respectively, for hawksbill and green turtles. This result contrasts with the predominantly high female skew reported for offspring at most rookeries around the globe and highlights how local beach characteristics can drive incubation temperatures. Our evidence suggests that sites characterized by heavy shade associated with intact natural vegetation are likely to provide conditions suitable for male hatchling production in a warming world. Journal Article Journal of Experimental Marine Biology and Ecology 474 92 99 Ascension, Cape Verde, St Eustatius, operational sex ratio, temperature logger, temperature-dependant sex determination, endangered species, reptile, ICOADS, climate change, conservation, shading 31 12 2016 2016-12-31 10.1016/j.jembe.2015.09.015 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2019-07-17T17:48:56.1667700 2015-10-17T11:56:59.4209568 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Jacques-Olivier Laloë 1 Nicole Esteban 0000-0003-4693-7221 2 Jessica Berkel 3 Graeme C. Hays 4 0023842-02052019144516.pdf Laloe_Esteban_etal_2016_Caribbean-sand-temperatures-JEMBE-acceptedManuscript.pdf 2019-05-02T14:45:16.1270000 Output 827625 application/pdf Accepted Manuscript true 2019-05-02T00:00:00.0000000 true eng
title Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
spellingShingle Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
Nicole Esteban
title_short Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
title_full Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
title_fullStr Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
title_full_unstemmed Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
title_sort Sand temperatures for nesting sea turtles in the Caribbean: Implications for hatchling sex ratios in the face of climate change
author_id_str_mv fb2e760b83b4580e7445092982f1f319
author_id_fullname_str_mv fb2e760b83b4580e7445092982f1f319_***_Nicole Esteban
author Nicole Esteban
author2 Jacques-Olivier Laloë
Nicole Esteban
Jessica Berkel
Graeme C. Hays
format Journal article
container_title Journal of Experimental Marine Biology and Ecology
container_volume 474
container_start_page 92
publishDate 2016
institution Swansea University
doi_str_mv 10.1016/j.jembe.2015.09.015
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Sand temperatures at nest depths and implications for hatchling sex ratios of hawksbill turtles (Eretmochelys imbricata) and green turtles (Chelonia mydas) nesting in the Chagos Archipelago, Indian Ocean are reported and compared to similar measurements at rookeries in the Atlantic and Caribbean. During 2012-2014, temperature loggers were buried at depths and in beach zones representative of turtle nesting sites. Data collected for 12,546 days revealed seasonal and spatial patterns of sand temperature. Depth effects were minimal, perhaps modulated by shade from vegetation. Coolest and warmest temperatures were recorded in the more shaded sites during the austral winter and in more open sites during summer respectively. Overall, sand temperatures were relatively cool during the nesting seasons of both species which would likely produce fairly balanced hatchling sex ratios of 53% and 63% male hatchlings, respectively, for hawksbill and green turtles. This result contrasts with the predominantly high female skew reported for offspring at most rookeries around the globe and highlights how local beach characteristics can drive incubation temperatures. Our evidence suggests that sites characterized by heavy shade associated with intact natural vegetation are likely to provide conditions suitable for male hatchling production in a warming world.
published_date 2016-12-31T03:28:12Z
_version_ 1763751066573209600
score 11.012678

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