The climatic debt of loggerhead sea turtle populations in a warming world

Last modified: 
December 13, 2019 - 12:24pm
Type: Journal Article
Year of publication: 2019
Date published: 12/2019
Authors: Jonathan Monsinjon, Jeanette Wyneken, Kirt Rusenko, Milagros López-Mendilaharsu, Paulo Lara, Alexsandro Santos, Maria Marcovaldi, Mariana Fuentes, Yakup Kaska, Jenny Tucek, Ronel Nel, Kristina Williams, Anne-Marie LeBlanc, David Rostal, Jean-Michel Guillon, Marc Girondot
Journal title: Ecological Indicators
Volume: 107
Pages: 105657
ISSN: 1470160X

Phenological shifts, by initiating reproductive events earlier, in response to advanced seasonal warming is one of the most striking effects currently observed in wild populations. For sea turtles, phenological adjustment to warming conditions could be the most effective short-term adaptation option against climate change. We calculated future phenological changes required in seven important loggerhead (Caretta caretta) nesting populations to continue achieving a high hatching success and a sex ratio that lies within current ranges. Considering temperature-mediated phenological changes, we found that most populations (six out of seven) will not be able to keep pace with a warming climate. Under an optimistic climate warming scenario (RCP4.5), these populations will face a climatic debt, that is, a difference between required and expected phenological changes, and warming will substantially reduce hatching success and induce a feminization of hatchlings, which may jeopardize their reproductive sustainability. Our approach offers the possibility to quantify the efficiency of phenological shifts in oviparous reptiles by considering physiological, developmental and phenological processes.

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