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Gail Schofield

In-water Habitat Utilisation by Endangered Male Loggerhead Sea Turtles at the Mediterranean’s Largest Rookery

(Laganas Bay, National Marine Park of Zakynthos, Greece)




In this study three adult male loggerhead sea turtles (Caretta caretta) were tracked using GPS transmitters

from their breeding grounds on the Greek island of Zakynthos, to their foraging grounds and back to the

breeding grounds within a one year period.


We found that, when at the breeding ground, the males occupied a similar core home range size

(50% estimator; range: 2.9-19.7 km2) to that of breeding females, with movement being restricted to

a 7.5 km tract of coastline. Two males migrated out of the breeding area in late May, prior to the onset

of nesting, while one male remained resident to the island throughout the year. Plasticity in the foraging

strategy was also recorded with one migrant foraging at oceanic sites, while the other two males foraged

at coastal locations. This study presented a novel combination of both long-term and high resolution tracking

provides a clear picture of local and broad scale movement patterns of adult male loggerhead sea turtles.




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