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Worryingly, warmer temperatures will also lead to ocean expansion and sea-level rise, increasing the risk of flooding of nesting habitats. Sea turtles are particularly vulnerable because they have temperature-dependent sex determination, or TSD, meaning that the sex of the offspring depends on the incubation temperature of the eggs. This is the same mechanism that determines the sex of several other reptile species, such as the crocodilians, many lizards and freshwater turtles. Scientists and conservationists are well aware of how future temperatures may threaten these species.

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Plastics chemical BPA can make male turtles act like females - CBS News

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Sea turtle crisis: Moisture, not just heat impacts sex of sea turtle hatchlings

All relevant data are available from the Dryad Digital Repository at the following doi: Species that display temperature-dependent sex determination are at risk as a result of increasing global temperatures. For marine turtles, high incubation temperatures can skew sex ratios towards females. There are concerns that temperature increases may result in highly female-biased offspring sex ratios, which would drive a future sex ratio skew. Studying the sex ratios of adults in the ocean is logistically very difficult because individuals are widely distributed and males are inaccessible because they remain in the ocean.
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Three baby sea turtles finally reaching the ocean at Playa Mazunte, in the southern state of Oaxaca, Mexico note the little one diving into the wave! Credit: Nicole Keeney. In one population in Australia, lady sea turtles outnumber their male counterparts to 1. Less extreme but still notable, another Australian study of 75 turtle populations showed a female to male ratio of 3 females for every 1 male, indicating that the past few decades has seen a drastic shift in favor of majority-female sea turtle populations.
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