Temperature data loggers made by Onset (the loggers are called "HOBO") are opportunistically deployed in sea turtle nests on Keewaydin Island by Conservancy interns throughout the turtle nesting season. The study began after the Australian pine project to determine whether removing the pines affected incubation temperatures/sex ratios.
The study has continued in effort to examine long term temperature trends and the role environmental factors (rain, air temperature, storm events, climate change) play in determining hatchling sex. Reference loggers are also deployed in the sand along Keewaydin to record temperatures throughout the nesting season. For the past several years, loggers have also been deployed on Cape Romano so sand temperatures can be compared to Keewaydin. In 2013, Sea turtle license plate funds made it possible to include Sea Oat Island in the comparative study.
Partnership: Conservancy of Southwest Florida
Why it's Important: Keewaydin appears to be producing male hatchlings regularly which makes it a very important nesting ground. Nests on the east coast of Florida are producing mainly female biased clutches so Keewaydin is supplying the South Florida Nesting Subpopulation with much needed males. This is one of the longest and most intensive incubation temperature studies of its kind and is contributing invaluable data into the professional community. The data are also being used to educate the public on the anthropogenic and environmental factors that influence sea turtle nests. Data were published in 2008 and have been presented at several of the Annual Symposium on Sea Turtle Biology and Conservation conferences.
As of July 2018, 1,139 temperature data loggers have been deployed in sea turtle nests with the help of Conservancy interns.