Journal article
Vertical and horizontal habitat preferences of post-nesting leatherback turtles in the South Pacific Ocean
Marine ecology. Progress series (Halstenbek), v 422
01 Jan 2011
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Leatherback turtles are the largest and widest ranging turtle species, and spend much of their time in the offshore pelagic environment. However, the high seas have thus far received little management attention to protect their ecosystems and biodiversity. We tagged 46 female leatherback turtles with satellite transmitters at Playa Grande, Costa Rica from 2004 to 2007. In the present study, we analyzed the vertical and horizontal habitat preferences of these leatherback turtles in the South Pacific Ocean. The turtles exhibited short, shallow dives during their migration southward (mean depth: 45 m; mean duration: 23.6 min), followed by deeper, longer dives (mean depth: 56.7 m; mean duration: 26.4 min) in the South Pacific Gyre that probably indicated searching for prey. We integrated the horizontal movements with remotely sensed oceanographic data to determine the turtles' response to the environment, and applied this information to recommendations for conservation in the pelagic environment. A generalized additive mixed model applied to the daily turtle travel rates confirmed that slower travel rates occurred at cooler sea surface temperatures, higher chlorophyll a concentration and stronger vertical Ekman upwelling, all of which are considered favorable foraging conditions. The southern terminus (35 to 37 degrees S) of the leatherback tracks was also in an area of increased mesoscale activity that might act as a physical mechanism to aggregate their prey, gelatinous zooplankton. However, this could also act as a thermal limit to their distribution. This characterization of leatherback habitat use could aid the development of management efforts within the South Pacific Ocean to reduce mortality of leatherback turtles from fisheries interactions.
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Details
- Title
- Vertical and horizontal habitat preferences of post-nesting leatherback turtles in the South Pacific Ocean
- Creators
- George L. Shillinger - Stanford UniversityAlan M. Swithenbank - Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USAHelen Bailey - NOAA, NMFS, SWFSC, Div Environm Res, Pacific Grove, CA 93950 USASteven J. Bograd - NOAA, NMFS, SWFSC, Div Environm Res, Pacific Grove, CA 93950 USAMichael R. Castelton - Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USABryan P. Wallace - Conservat Int, Global Marine Div, Arlington, VA 22202 USAJames R. Spotila - Drexel UniversityFrank V. Paladino - Indiana Univ Purdue Univ, Dept Biol, Ft Wayne, IN 46805 USARotney Piedra - Minist Ambiente & Energia & Telecomun, San Jose 101041000, Costa RicaBarbara A. Block - Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USA
- Publication Details
- Marine ecology. Progress series (Halstenbek), v 422
- Publisher
- Inter-Research
- Number of pages
- 15
- Grant note
- Lenfest Ocean Program Earthwatch Institute Packard Foundation; The David & Lucile Packard Foundation National Aeronautics and Space Administration (NASA); National Aeronautics & Space Administration (NASA) Cinco Hermanos Fund Tagging of Pacific Predators program of the Census of Marine Life Office of Naval Research Gordon and Betty Moore Foundation Alfred P. Sloan Foundation UNESCO (via the United Nations Foundation)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:000286933500025
- Scopus ID
- 2-s2.0-79551691264
- Other Identifier
- 991019168183304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Ecology
- Marine & Freshwater Biology
- Oceanography