Proceedings of the Royal Society: B, Biological Sciences
Fisheries bycatch is a critical source of mortality for rapidly declining populations of leatherback turtles, Dermochelys coriacea. We integrated use-intensity distributions for 135 satellite-tracked adult turtles with longline fishing effort to estimate predicted bycatch risk over space and time in the Pacific Ocean. Areas of predicted bycatch risk did not overlap for eastern and western Pacific nesting populations, warranting their consideration as distinct management units with respect to fisheries bycatch. For western Pacific nesting populations, we identified several areas of high risk in the north and central Pacific, but greatest risk was adjacent to primary nesting beaches in tropical seas of Indo- Pacific islands, largely confined to several exclusive economic zones under the jurisdiction of national authorities. For eastern Pacific nesting populations, we identified moderate risk associated with migrations to nesting beaches, but the greatest riskwas in the South Pacific Gyre, a broad pelagic zone outside nationalwaterswhere management is currently lacking andmay prove difficult to implement. Efforts should focus on these predicted hotspots to developmore targeted management approaches to alleviate leatherback bycatch.
critically endangered species, fisheries bycatch, marine conservation, marine turtles, migratory pelagic vertebrate, satellite tracking
Biology | Ecology and Evolutionary Biology
John H. Roe, Stephen J. Morreale, Frank V. Paladino, George L. Shillinger, Scott R. Benson, Scott A. Eckert, Helen Bailey, Pilar Santidrian Tomillo, Steven J. Bograd, Tomoharu Eguchi, Peter H. Dutton, Jeffrey A. Seminoff, Barbara A. Block, and James R. Spotila (2014).
Predicting bycatch hotspots for endangered leatherback turtles on longlines in the Pacific Ocean. Proceedings of the Royal Society: B, Biological Sciences.281, 20132559.