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Communication Dans Un Congrès Année : 2018

Environmental effects on larval fish ontogenetic vertical migration

Résumé

Ontogenetic Vertical Migration (OVM) is described by the changes in the depth of center of mass between early pre-flexion and more developed post-flexion larval stages. This behavior is mainly driven by taxa and ontogeny and is one of the prominent trait retaining larvae near their birth place. When incorporated into biophysical models of larval transport, this particular behavior contributes to change the outcome of the dispersal within sheered flows, decreasing dispersal kernels and changing connectivity patterns. Yet, only a few studies have reported the OVM of fishes and none has so far focused on investigating environmental forcing mechanisms. Here we test the hypothesis that fish larvae are responding to changes in environmental conditions by modifying the center of mass and range of their vertical distribution in the water column. We use an extensive ichthyoplankton survey around the island of Barbados to demonstrate that OVM changes not only between day and night times, but also with water chemistry. This study provides a basis for evaluating expected OVM and dispersal changes in a changing ocean.
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Dates et versions

hal-04026421 , version 1 (13-03-2023)

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  • HAL Id : hal-04026421 , version 1

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Claire B. Paris, Robin Faillettaz, Jean-Olivier Irisson. Environmental effects on larval fish ontogenetic vertical migration. Larval Fish Conference, 2018, Victoria, British Columbia, Canada. ⟨hal-04026421⟩
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