Depth stratified light trap sampling reveals variation in the depth distribution of late-stage cryptobenthic reef fish larvae

Author:

Douglas Sophia R. L.,Tebbett Sterling B.,Choukroun Severine,Goatley Christopher H. R.,Bellwood David R.ORCID

Abstract

AbstractCryptobenthic fishes are abundant on coral reefs, and their larvae dominate the ichthyoplankton in near reef waters. However, we have a limited understanding of how pelagic and on-reef processes are linked, especially how late-stage cryptobenthic fish larvae use near reef waters. We therefore used depth-stratified light trap sampling from 2 to 27 m at Lizard Island, Great Barrier Reef. This revealed clear depth variation in late-stage larval fish assemblages. Gobiidae larvae characterised mid-depth (13 m) samples. By contrast, larval Apogonidae were only abundant in shallow samples. Deep samples were typified by (non-target) adult apogonids. Contrary to expectations that poor-swimming cryptobenthic larvae would be flow-sheltering in deeper water, our results suggest that late-stage cryptobenthic larvae use large portions of the water column, although their preferred positions may be taxon-specific.

Funder

Australian Research Council

James Cook University

Publisher

Springer Science and Business Media LLC

Subject

Aquatic Science

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