Tropical flatback turtle (Natator depressus) embryos are resilient to the heat of climate change

The Journal of Experimental Biology
Robert HowardDavid A Pike

Abstract

Climate change is threatening reproduction of many ectotherms by increasing nest temperatures, potentially making it more difficult for females to locate nest sites that provide suitable incubation regimes during embryonic development. Elevated nest temperatures could increase the incidence of embryonic mortality and/or maladaptive phenotypes. We investigated whether elevated nest temperatures reduce hatching success in tropical flatback turtles (Natator depressus) nesting in the Gulf of Carpentaria, Australia. Egg incubation treatments began at 29.5°C and progressively increased in temperature throughout incubation, up to maxima of 31, 32, 33, 34 and 35°C. Elevated nest temperatures did not reduce hatching success or hatchling body size relative to control temperatures (29.5°C), but did speed up embryonic development. A combination of sudden exposure to high temperatures during the first 2 weeks of incubation (>36°C for 48 h) and prolonged warming throughout incubation (from 29.5-35°C) did not reduce hatching success. We also recorded an unusually high pivotal sex-determining temperature in this flatback turtle population relative to other sea turtle populations: an equal ratio of male and female hatchlings is produced at ∼30....Continue Reading

References

May 7, 2008·Proceedings of the National Academy of Sciences of the United States of America·Curtis A DeutschPaul R Martin
Sep 23, 2011·Proceedings. Biological Sciences·Sam B WeberJonathan D Blount
Oct 10, 2013·Global Change Biology·David A Pike

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Citations

Jun 18, 2017·Global Change Biology·Jacques-Olivier LaloëGraeme C Hays
Jul 4, 2020·Integrative and Comparative Biology·Jeanette Wyneken, Michael Salmon
May 26, 2017·PloS One·Pilar Santidrián TomilloDaniel Oro

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