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Movements and habitat-use of loggerhead sea turtles in the northern Gulf of Mexico during the reproductive period

PLoS ONE

By:
, , , , and
DOI: 10.1371/journal.pone.0066921

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Abstract

Nesting strategies and use of important in-water habitats for far-ranging marine turtles can be determined using satellite telemetry. Because of a lack of information on habitat-use by marine turtles in the northern Gulf of Mexico, we used satellite transmitters in 2010 through 2012 to track movements of 39 adult female breeding loggerhead turtles (Caretta caretta) tagged on nesting beaches at three sites in Florida and Alabama. During the nesting season, recaptured turtles emerged to nest 1 to 5 times, with mean distance between emergences of 27.5 km; however, several turtles nested on beaches separated by ~250 km within a single season. Mean total distances traveled throughout inter-nesting periods for all turtles was 1422.0±930.8 km. In-water inter-nesting sites, delineated using 50% kernel density estimation (KDE), were located a mean distance of 33.0 km from land, in water with mean depth of −31.6 m; other in-water inter-nesting sites, delineated using minimum convex polygon (MCP) approach, were located a mean 13.8 km from land and in water with a mean depth of −15.8 m. Mean size of in-water inter-nesting habitats were 61.9 km2 (50% KDEs, n = 10) and 741.4 km2 (MCPs, n = 30); these areas overlapped significantly with trawling and oil and gas extraction activities. Abundance estimates for this nesting subpopulation may be inaccurate in light of how much spread there is between nests of the same individual. Further, our results also have consequences for critical habitat designations for northern Gulf loggerheads, as protection of one nesting beach would not encompass the entire range used by turtles during breeding seasons.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Movements and habitat-use of loggerhead sea turtles in the northern Gulf of Mexico during the reproductive period
Series title:
PLoS ONE
DOI:
10.1371/journal.pone.0066921
Volume
8
Issue:
7
Year Published:
2013
Language:
English
Publisher:
Public Library of Science
Contributing office(s):
Southeast Ecological Science Center
Description:
15 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
PLoS ONE
Country:
United States
State:
Alabama;Florida
Other Geospatial:
Gulf Of Mexico