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The zooplankton prey field for rock lobster phyllosoma larvae in relation to oceanographic features of the south-eastern Indian Ocean

Citation

Sawstrom, C and Beckley, LE and Saunders, MI and Thompson, PA and Waite, AM, The zooplankton prey field for rock lobster phyllosoma larvae in relation to oceanographic features of the south-eastern Indian Ocean, Journal of Plankton Research, 36, (4) pp. 1003-1016. ISSN 0142-7873 (2014) [Refereed Article]

Copyright Statement

Copyright The Author 2014

DOI: doi:10.1093/plankt/fbu019

Abstract

The western rock lobster, Panulirus cygnus, provides Australia's most valuable wild caught fishery but, in recent years, there has been a dramatic decline in settlement of the post-larval phase into their natal coastal habitat. One hypothesis for this decline was that the oceanographic conditions no longer favour the survival, feeding and growth of the larval (phyllosoma) phase. To explore this, the oceanography and corresponding zooplankton prey field along five latitudinal transects in the southeastern Indian Ocean were quantified during July 2010. Leeuwin Current Water (LCW) and Sub-Tropical Surface Water (STSW) were distinguished and a prominent front at ~30S characterized by strong eastward flow separated them. Although zooplankton abundance increased towards the north, the prey field was unevenly distributed with patches of higher prey concentration associated mainly with LCW. Chaetognaths were the most abundant prey item (means: 17.2 and 4.1 m-3 in LCW and STSW, respectively) and were positively correlated with chlorophyll a in both water masses. Panulirus cygnus phyllosoma had a highly patchy distribution but, despite lower prey concentrations, were more abundant in STSW than LCW, particularly south of the front. Our results suggest that LC meso-scale features with strong fronts may be implicated in phyllosoma aggregations and shoreward transport of late-stage larvae and that this warrants further investigation.

Item Details

Item Type:Refereed Article
Keywords:biological oceanography, chaetognaths, chlorophyll a, Leeuwin Current, Panulirus cygnus, water masses
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Thompson, PA (Dr Peter Thompson)
ID Code:119602
Year Published:2014
Web of Science® Times Cited:5
Deposited By:IMAS - Directorate
Deposited On:2017-08-03
Last Modified:2017-09-18
Downloads:0

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