Using an oceanographic model to investigate the mystery of the missing puerulus
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Published:2022-01-28
Issue:2
Volume:19
Page:517-539
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Kolbusz Jessica, Langlois Tim, Pattiaratchi CharithaORCID, de Lestang Simon
Abstract
Abstract. Dynamics of ocean boundary currents and associated shelf
processes can influence onshore and offshore water transport, critically
impacting marine organisms that release long-lived pelagic larvae into the
water column. The western rock lobster, Panulirus cygnus, endemic to Western Australia, is
the basis of Australia's most valuable wild-caught commercial fishery. After
hatching, western rock lobster larvae (phyllosoma) spend up to 11 months in
offshore waters before ocean currents and their ability to swim transports
them back to the coast. The abundance of western rock lobster post-larvae
(puerulus) provides a puerulus index used by fishery managers as a
predictor of lobster abundance 3–4 years later. This index has historically
been positively correlated with the strength of the Leeuwin Current. In 2008
and 2009, the Leeuwin Current was strong, yet a settlement failure occurred
throughout the fishery, prompting management changes and a rethinking of
environmental factors associated with their settlement. Thus, understanding
factors that may have been responsible for the settlement failure is
essential for fishery management. Oceanographic parameters likely to
influence puerulus settlement were derived for 17 years to investigate
correlations. Analysis indicated that puerulus settlement at adjacent
monitoring sites has similar oceanographic forcing, with kinetic energy in
the offshore and the strength of the Leeuwin Current being key factors.
Settlement failure years were synonymous with “hiatus” conditions in the
southeast Indian Ocean and periods of sustained cooler water present
offshore. Post-2009, there has been an unusual but consistent increase in
the Leeuwin Current during the early summer months, with a matching decrease
in the Capes Current, which may explain an observed settlement timing
mismatch compared to historical data. Our study has revealed that a
culmination of these conditions likely led to the recruitment failure and
subsequent changes in puerulus settlement patterns.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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