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Modeling Antarctic krill circumpolar spawning habitat quality to identify regions with potential to support high larval production

Citation

Green, DB and Bestley, S and Corney, S and Trebilco, R and Lehodey, P and Hindell, MA, Modeling Antarctic krill circumpolar spawning habitat quality to identify regions with potential to support high larval production, Geophysical Research Letters, 48, (12) Article e2020GL091206. ISSN 0094-8276 (2021) [Refereed Article]


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Copyright Statement

An edited version of this paper was published by AGU. Copyright 2021 American Geophysical Union

DOI: doi:10.1029/2020GL091206

Abstract

Antarctic krill (krill) are important within Southern Ocean ecosystems and support an expanding fishery. Toward understanding krill's response to environmental change, it is necessary to identify regions that support high krill larval production (spawning habitat). We develop a mechanistic model combining thermal and food requirements for krill egg production, with predation pressure post-spawning, to predict regions of high-quality spawning habitat. We optimize our model regionally and generate circumpolar predictions of spawning habitat quality. Our results indicate the southwest Atlantic accounts for almost half of all predicted high-quality spawning habitat. Small-scale management units (SSMUs) around the Antarctic Peninsula had high coverage of high-quality spawning habitat. In contrast, the remaining SSMUs (except around South Georgia) were poorly covered, suggestive of population sinks reliant on input from external sources upstream. This implies strong potential for downstream impacts of fishing in key spawning areas, with implications for management of SSMUs and the krill fishery.

Item Details

Item Type:Refereed Article
Keywords:Antarctic krill, Southern Ocean, biological oceanography, Antarctic ecosystems, spawning habitat, management units, population connectivity
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Assessment and management of Antarctic and Southern Ocean ecosystems
UTAS Author:Green, DB (Mr David Green)
UTAS Author:Bestley, S (Dr Sophie Bestley)
UTAS Author:Corney, S (Dr Stuart Corney)
UTAS Author:Trebilco, R (Dr Rowan Trebilco)
UTAS Author:Hindell, MA (Professor Mark Hindell)
ID Code:144888
Year Published:2021
Funding Support:Australian Research Council (DE180100828)
Deposited By:Ecology and Biodiversity
Deposited On:2021-06-17
Last Modified:2021-08-25
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