Worldwide distributions of tuna larvae: revisiting hypotheses on environmental requirements for spawning habitats
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Autor/esReglero, P. (Patricia); Tittensor, D.P. (Derek P.); Álvarez-Berastegui, D. (Diego); Aparicio-González, A. (Alberto); Worm, B. (Boris)
Versión del editorhttp://www.int-res.com/abstracts/meps/v501/p207-224/
Palabras claveSpawning habitat
Ocean triad hypothesis
Tuna are among the most ubiquitous oceanic predators, and range globally from the equator to temperate regions (0 to 55° latitude). While the distribution of adult fish has been mapped from fishing records, the extent of tuna spawning and larval habitats is less well understood. We compiled and analyzed data on the global distributions of larval occurrence for 7 major oceanic tuna species to investigate environmental predictors of larval habitat. Our results showed that tuna larvae occur within the adults’ distributional range, but were restricted to lower latitudes and higher water temperatures than adults, largely consistent with Schaefer’s ‘temperature hypothesis’. Temperature requirements explained much of the variation in larval occurrence, though temperature by itself tended to over-predict the extent of larval habitats. We also demonstrate that tuna larvae have an elevated probability of occurrence at intermediate values of eddy kinetic energy, generally supporting Bakun’s ‘ocean ...
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