Archive · 20 Jan 2026
Climate Change Threatens Reptile Reproduction and Survival
Climate change is making it harder for some reptiles to have babies.
Many reptiles, like lizards and turtles, become male or female based on the temperature of their eggs, not their genes.
As the world gets warmer, this could lead to too many males or females in some species, making it difficult for them to find mates.
This could also reduce their genetic diversity, which helps them adapt to changes.
Additionally, reptiles are already facing other problems like habitat loss and pollution, making their survival even more challenging.
Scientists are studying these issues to better understand and protect these ancient creatures.
Climate change is altering reptile sex ratios due to temperature-dependent sex determination (TSD).
Extreme temperatures can affect genetic recombination, reducing genetic diversity in some species.
Reptiles may adapt by nesting earlier, in shadier places, or digging deeper, but this depends on their ability to perceive and respond to temperature shifts.
Additional threats like habitat loss and pollution further endanger reptile populations.
Scientists can predict how temperature changes might affect sex ratios in the wild by studying the genetic makeup of males and females.
- Who
- Reptiles, including lizards, crocodiles, and turtles
- What
- Climate change affecting reptile reproduction and genetic diversity
- When
- Current and projected impacts up to the year 2100
- Where
- Global, with specific mention of Madagascar for the Guibé’s ground gecko
- Why
- Warming temperatures alter sex ratios and genetic recombination, threatening species survival
- Species Affected
- Lizards, crocodiles, turtles, and other reptiles
- Temperature-Dependent Sex Determination (TSD)
- Sex determined by incubation temperature, not genes
- Potential Impact by 2100
- Possible single-sex alligator populations
- Genetic Recombination
- Extreme temperatures can alter genetic recombination in some species
- Additional Threats
- Habitat degradation, pollution, and other human influences
- Study Journal
- PLOS Genetics
- Study Species
- Guibé’s ground gecko (Paroedura guibeae)