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Researchers at Florida Atlantic University are raising concerns about the growing number of female sea turtles hatching along Florida’s beaches. Led by marine biologist Jeanette Wyneken, the research team has monitored nest temperatures and examined young loggerhead, leatherback, and green sea turtles for more than two decades. Their observations reveal a troubling pattern: some nesting seasons produce almost no males, while others produce only about 1% to 2% males among the hatchlings examined. All the turtles currently being raised and studied in the university’s laboratory are female. Although sea turtle populations naturally produce more females than males, researchers are concerned that increasingly warm nesting beaches could create a serious imbalance. The findings suggest that climate change may be affecting not only sea turtle survival but also their ability to reproduce in future generations (Florida Atlantic University, 2026).
The biological explanation involves a process called temperature-dependent sex determination, in which the temperature surrounding developing eggs influences whether hatchlings become male or female. Cooler incubation temperatures generally produce males, while warmer temperatures produce females. To investigate this relationship, Wyneken’s team places temperature-recording devices inside nests and raises selected hatchlings until their sex can be directly identified through a minimally invasive examination. Researchers have also observed that excessive heat can damage developing embryos and reduce hatching success. In the latest monitoring season, estimated hatching success was approximately 53%, compared with the expected 65% to 75% (Florida Atlantic University, 2026). Supporting evidence comes from a separate peer-reviewed study examining more than 110,000 sea turtle nests in Florida. That study documented shorter incubation periods over time, consistent with increasingly warm nest conditions and a growing proportion of female hatchlings (Ceriani & Casale, 2025).
These observations raise important questions about the long-term reproductive health of sea turtle populations. Female sea turtles need males to fertilize their eggs, and extremely low male production could eventually make successful reproduction more difficult. However, a female-dominated hatchling population does not automatically mean extinction, because individual males can mate with multiple females and turtles from different nesting areas may contribute to reproduction. Another challenge is that sea turtles can take approximately 20 to 30 years to reach sexual maturity, so the full consequences of today’s unusually warm nests may not become apparent for decades (Florida Atlantic University, 2026). Importantly, the Florida findings should not be interpreted as evidence that all sea turtle populations worldwide are becoming entirely female. A separate global analysis found that populations living in warmer environments may have locally adjusted temperature thresholds for producing males and females, suggesting some ability to withstand warming conditions (Tromp et al., 2025). Nevertheless, the continued production of very few males in some Florida nesting areas remains an important conservation warning.
From a conservation perspective, the research highlights the need to protect nesting beaches while developing better ways to monitor and manage incubation temperatures. Providing shade, carefully cooling nests, and protecting naturally cooler nesting areas may help increase male production, although these approaches require careful evaluation because their effectiveness and ecological consequences can vary. Researchers also need to examine nests across different beaches and nesting seasons to identify where male hatchlings are still being produced. Such information could help conservation programs prioritize habitats that support healthier reproductive populations. While local adaptation may offer some protection, it is uncertain whether sea turtles can adjust quickly enough to keep pace with continued climate warming (Tromp et al., 2025). Overall, the findings demonstrate how changes in environmental temperature can influence animal development, reproduction, and population stability. Protecting sea turtles therefore requires more than saving individual hatchlings; it also means maintaining the environmental conditions needed to produce future generations of both males and females.
References
Ceriani, S. A., & Casale, P. (2025). Long-term incubation duration decline indicates climate-change driven feminization of three sea turtle species in Florida, USA. Global Change Biology, 31(10), e70559. https://doi.org/10.1111/gcb.70559
Florida Atlantic University. (2026, November 6). Oh boy, all girls again: Research tracks sea turtle sex ratios. Phys.org. https://phys.org/news/2026-11-boy-girls-tracks-sea-turtle.html
Tromp, J. J., Staines, M. N., Laloë, J.-O., & Hays, G. C. (2025). Local adaptation may help mitigate feminisation of sea turtle populations globally. Global Change Biology, 31(9), e70458. https://doi.org/10.1111/gcb.70458
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