Loggerhead turtle nesting on Sal island 321
rise and beach erosion (Hamann et al., 2013; Varela et al., 2018), and higher temperatures can lead to female-biased sex ratios and increased nest failures (Laloë et al., 2017). At some sites in other locations, long-term increases in thenumber of nests at rookeries have been followed by long- term declines (Mazaris et al., 2017; NALWG, 2018), and the increases in nesting numbers that we report should there- fore be used to drive continued marine turtle conservation and surveying efforts in the Cape Verde islands, to help en- sure the long-term conservation of this important logger- head turtle population. Our findings highlight the value of long-term monitor-
ing efforts and the importance of making abundance data available to improve conservation assessments. Lack of data can have profound implications for conservation man- agement, and we encourage others working with marine turtles or different taxa to make their data available for conservation assessments.
Acknowledgements The authors thank SOS Tartarugas and Project Biodiversity for their ongoing conservation work, the numer- ous volunteers who helped with data collection, and two anonymous reviewers for their critiques. J-OL received funding for fieldwork from the Alasdair Downes Marine Conservation Fund and from the Society for Experimental Biology.
Author contributions Study conception: all authors; data collec- tion: JC, BR, AT; data analysis: J-OL; writing: J-OL, GCH; revision: all authors.
Conflicts of interest None.
Ethical standards This research abided by the Oryx guidelines on ethical standards, was endorsed by the Ministry of Agriculture and Environment of Cape Verde through authorizations issued by the National Directorate of the Environment (permit number 24/2017) and complied with all relevant local and national legislation.
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Oryx, 2020, 54(3), 315–322 © 2019 Fauna & Flora International doi:10.1017/S0030605318001497
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