Movement Patterns for a Critically Endangered Species, the Leatherback Turtle (Dermochelys coriacea), Linked to Foraging Success and Population Status

被引:55
作者
Bailey, Helen [1 ,2 ]
Fossette, Sabrina [3 ]
Bograd, Steven J. [2 ]
Shillinger, George L. [4 ,5 ]
Swithenbank, Alan M. [5 ]
Georges, Jean-Yves [6 ,7 ]
Gaspar, Philippe [8 ]
Stromberg, K. H. Patrik [9 ]
Paladino, Frank V. [10 ]
Spotila, James R. [11 ]
Block, Barbara A. [5 ]
Hays, Graeme C. [3 ]
机构
[1] Univ Maryland, Chesapeake Biol Lab, Ctr Environm Sci, Solomons, MD 20688 USA
[2] NOAA, Natl Marine Fisheries Serv, SWFSC, Div Environm Res, Pacific Grove, CA USA
[3] Swansea Univ, Dept Biosci, Coll Sci, Swansea, W Glam, Wales
[4] Ctr Ocean Solut, Monterey, CA USA
[5] Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USA
[6] Univ Strasbourg, IPHC, Strasbourg, France
[7] CNRS, UMR7178, F-67037 Strasbourg, France
[8] Collecte Localisat Satellites, Dept Marine Ecosyst, Satellite Oceanog Div, Ramonville St Agne, France
[9] Swedish Meteorol & Hydrol Inst, S-60176 Norrkoping, Sweden
[10] Indiana Purdue Univ, Dept Biol, Ft Wayne, IN USA
[11] Drexel Univ, Dept Biol, Philadelphia, PA 19104 USA
关键词
SEA-TURTLES; MARINE PREDATOR; PACIFIC; ZOOPLANKTON; BEHAVIOR; HABITATS; LOGGERHEAD; DICHOTOMY; CONTEXT;
D O I
10.1371/journal.pone.0036401
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Foraging success for pelagic vertebrates may be revealed by horizontal and vertical movement patterns. We show markedly different patterns for leatherback turtles in the North Atlantic versus Eastern Pacific, which feed on gelatinous zooplankton that are only occasionally found in high densities. In the Atlantic, travel speed was characterized by two modes, indicative of high foraging success at low speeds (<15 km d(-1)) and transit at high speeds (20-45 km d(-1)). Only a single mode was evident in the Pacific, which occurred at speeds of 21 km d(-1) indicative of transit. The mean dive depth was more variable in relation to latitude but closer to the mean annual depth of the thermocline and nutricline for North Atlantic than Eastern Pacific turtles. The most parsimonious explanation for these findings is that Eastern Pacific turtles rarely achieve high foraging success. This is the first support for foraging behaviour differences between populations of this critically endangered species and suggests that longer periods searching for prey may be hindering population recovery in the Pacific while aiding population maintenance in the Atlantic.
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页数:8
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