FAU’s turtle laboratory provides a close look at hatchling sex and nest conditions, but its results are not a census of hatchlings across Florida. The university says all 40 young turtles recently released from the lab were female and that the team has recorded other seasons with no males or very few. Those findings describe the turtles researchers examined. TAPinto Boca Raton reported on the release and the university’s findings.
What the lab can establish
Jeanette Wyneken, an FAU biological sciences professor and director of its Marine Science Laboratory, has monitored hatchlings and nest temperatures for 24 years. Her team studies loggerhead, leatherback and green turtles, comparing confirmed hatchling sex with recorded nest temperatures. The university says direct sex verification requires specialized expertise and facilities, and few programs do this work. Its records also show a warming trend over the monitoring period. Florida Atlantic University’s release describes the research, and TAPinto Boca Raton covered the findings.
Temperature, weather and hatchling outcomes
Nest temperature affects sea turtle sex development: warmer nests tend to produce females, while cooler ones tend to produce males. In the turtles it examines, FAU’s team has found repeated years with no males or only a small proportion. The university says its benchmark for sustaining a population is about 25 percent males every three to four years, a level the areas it monitors have not met, according to the university release.
The university also reports an estimated hatching success of about 53 percent this year, below its expected range of 65 to 75 percent. Excessive nest heat can kill embryos or cause developmental problems in hatchlings, FAU says. Weather can affect nest conditions too: WFLX reported that heavy rain can cool sand, and that wetter years and cooler parts of the nesting season are associated with more male hatchlings.
Nest totals and sex tests measure different things
Florida’s nest counts offer a separate measure of turtle activity, not a direct reading of hatchling sex ratios. The New York Times reported that green turtle nests exceeded 74,300 in 2023, about 40 percent above the previous record set in 2017. The report also said 87 to 100 percent of the green turtle hatchlings Wyneken tested in recent seasons were female. Those results concern different measures and cannot establish sex ratios across Florida.
What Florida nest counts can—and can’t—show
According to the Florida Fish and Wildlife Conservation Commission’s Fish and Wildlife Research Institute, monitored Florida beaches averaged 158,861 sea turtle nests a year from 2019 to 2023 across all species combined. That statewide figure describes nesting activity; it does not provide hatchling sex ratios or show how nest counts changed specifically in Palm Beach County.
The timeline for assessing any effect on breeding populations is long: FAU says Florida’s sea turtles take about 20 to 30 years to reach sexual maturity and estimates that roughly one in 1,000 hatchlings survives to adulthood. Wyneken’s team continues comparing verified sex results with nest-temperature records, and the university says more information from additional locations is needed to assess the wider pattern. Florida Atlantic University provides those estimates and describes the team’s ongoing work.
