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Ocean currents, individual movements and genetic structuring of populations

journal contribution
posted on 2018-01-01, 00:00 authored by L Cardona, Graeme HaysGraeme Hays
© 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Ocean currents profoundly impact all life in the oceans and over a broad size spectra species may show both horizontal and vertical movements to stay on preferred locations. As a corollary it might be expected that individuals in preferred oceanic habitats may simply drift with flows. We explored these scenarios by both satellite tracking young pelagic loggerhead turtles and examining the genetic structuring of individuals on coastal foraging areas across the Mediterranean in relation to ocean flows measured both with Lagrangian drifters and a numerical ocean circulation model for the area. Both patterns of movement (n = 18 turtles ranging in size from 41.2 to 68.5 cm CCL tracked for up to 460 days) and genetic structuring (n = 165 individuals from six sites across the ocean basin) suggested that ocean flows profoundly impact the movements of immature turtles and suggest a pattern of largely passive drift within an ocean basin that, throughout, is broadly favourable for developing loggerhead turtles. The situation contrasts with more heterogeneous habitats in the Atlantic and Pacific, where larger amounts of directional swimming may be required to avoid sub-optimum areas.

History

Journal

Marine Biology

Volume

165

Article number

10

Location

New York, N.Y.

ISSN

0025-3162

eISSN

1432-1793

Language

English

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2017, Springer-Verlag GmbH

Issue

1

Publisher

SPRINGER HEIDELBERG