Activity and Habitat Selection by Loggerhead (Caretta caretta L.) and Green Turtle (Chelonia mydas. L.) Hatchlings: A Laboratory and Field Study.

Loggerhead and green turtle neonates migrate from Florida's coast during a 24-36
h frenzy. Post-frenzy loggerheads are often found in flotsam (Sargassum), while postfrenzy
green turtles "disappear." This study compared the frenzy and post-frenzy activity
of each species, their response to flotsam (in the laboratory and field), and the role of
experience in habitat selection. Both species were most active during day I; activity
thereafter declined (especially in loggerheads). Inactive loggerheads occupied Sargassum
and open water (day or night) whereas inactive green turtles occupied Sargassum by day
and both habitats at night. Exposure to Sargassum had no effect on the later habitat
choices ofloggerheads, while exposed green turtles preferred Sargassum over plastic
plants. In the field, both species preferred flotsam to open water, but occupied distinct
microhabitats. Loggerheads preferred the mat surface while green turtles hid within the
mat. Differences in activity and habitat selection likely reflect species-specific migratory
and anti-predator strategies.