08/24/2023
Could climate change determine the s*x of giant tortoises in Galapagos? 🐢 In their latest study, our giant tortoise researchers delve into the impact of nest location and temperature in influencing the s*x of hatchling tortoises.
The objective of this study was to determine how climate change might affect the s*x ratios of giant tortoises and the possible consequences for the conservation of these species. 🌡️🐢
“Our study provides the first data on the impact of nest incubation temperature on the s*x ratios of free-living Galapagos tortoises,” said Stephen Blake, study co-author, CDF visiting scientist and professor at St. Louis University. “Monitoring s*x ratios of populations most vulnerable to climate change may be important in guiding conservation actions, such as temperature-controlled incubation to optimize future s*x ratios.”
The study showed that in nests at low and medium elevations, about 90% of the hatchlings were female, while higher elevation nests leaned toward 80% male hatchlings. These results suggest that climate change and nesting decisions made by females will strongly influence the future s*x ratios (males and females) of the populations of these species.
For Galapagos, a possible temperature increase of 1-4°C. has been announced, which could influence tortoise reproduction in aspects such as the availability of nesting areas; nest conditions, such as temperature, precipitation and surrounding vegetation; and nest performance, such as hatching success and male to female ratios.
The results will allow the environmental authority to adopt management measures, if necessary, based on scientific information, in order to preserve Galapagos giant tortoise populations.
This research was led by the Charles Darwin Foundation in coordination with Parque Nacional Galápagos and was supported by the Institute of Conservation Medicine of the Saint Louis Zoo, the Galapagos Conservation Fund, the Houston Zoo, Freunde der Galápagos Inseln Schweiz, the Research and Exploration Committee of the National Geographic Society and the National Science Foundation (NSF) .
For more details, read the full blog here: https://t.ly/xjy4q
📷 Patrick Moldowan/CDF, Rashid Cruz/CDF