Female Turtles Are Outnumbering Males Because of Rising Temperatures

Climate change is affecting sea turtles in an unusual way: sex. The sex of hatchlings, that is.

According to a study by Florida State University, rising global temperatures are causing a gender imbalance. Scientists researched Brazilian loggerhead turtles and found that the warmer temperatures cause higher incubating temperatures, which leads to more female hatchlings.

Optimal hatching temperatures are between 75.2 to 93.2 degrees Fahrenheit, but temperatures below 85.1 degrees results in more male turtles and temperatures above yield more females.

Photo by U.S. Fish and Wildlife Service Northeast Region / CC BY 2.0
Photo by U.S. Fish and Wildlife Service Northeast Region / CC BY 2.0

Assistant Professor of Oceanography at Florida State University Mariana Fuentes said:

“We’re concerned we’re going to have a feminization of marine turtles. This study came from the need to understand the current sex ratio being produced at loggerhead nesting grounds to establish baseline parameters as climate change progresses and to identify beaches that produce a higher proportion of males.”

Researchers believe projected increases in temperature will cause gender imbalance in marine turtle populations to worsen. Fuente and her team will move forward trying to identify the best practices to protect the turtles. They will coordinate with government officials and conservationists in Brazil to create conservation plans, working to make sure this imbalance does not negatively impact the species.

Photo by U.S. Fish and Wildlife Service Southeast Region / CC BY 2.0
Photo by U.S. Fish and Wildlife Service Southeast Region / CC BY 2.0

 
 
Featured image by U.S. Fish and Wildlife Service Northeast Region / CC BY 2.0

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