“Just Keep Swimming:” Movements of Female Olive Ridley and Hawksbill Sea Turtles
By: Heidi Klise
I was inspired by an article that I read a few years ago in Nautilus magazine, Where the Wild Things Go. Oliver Uberti wrote the article and also created the gorgeous illustrated maps of elephant and sea turtle migration data. “To protect animals you need to protect where they go,” said Archie Carr, one of the pioneer sea turtle trackers, when asked about the reason for tracking wild animals. The ocean has a number of Marine Protected Areas (MPAs) to protect habitats and migration routes from fishing and shipping routes. Sea turtle tracking supports animal welfare by showing scientists the amount of ocean area that needs to be protected to save these species from extinction. In the article, Uberti highlights the Marine Turtle Research Group at the University of Exeter and their project, seaturtle.org, to track loggerhead sea turtles. The resulting maps created from seaturtle data, are visually stunning and easy to read, I’ve thought about these maps multiple times since the article came out.
For my map, I chose to use data from the Global Biodiversity Information Facility (GBIF), because it was more straightforward and easier to work with. Even though the data is from 2005 and 2009-11 and is already plotted on maps on the website, I wanted to see if I could successfully map data as well. Olive Ridley (Lepidochelys olivacea) are the second smallest sea turtle species at about 2.5 feet. Hawksbill turtles (Eretmochelys imbricata) have the most vibrant shells and are what most people picture when they think of sea turtles. Both are found in Australia, and the movement of nesting females is the data that I used. The Olive Ridley population has been nearly cut in half since 1960 and the Hawksbill population has decreased by over 80 percent in the last century.
I’ve been fascinated with sea turtles since I witnessed Loggerheads nesting and hatching in Trinidad. I’m curious about Geographic Information Systems, and am trying to figure out how to translate a LIS degree to a job at a zoo, aquarium, or marine biology research station.
Top of page photo sources: (left image) Aguadormi, identified hawksbill turtle, Maldives © Chiara Fumagalli and (right image) Olive Ridley turtle, worldwildlife.org