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Spatially explicit food web modelling to consider fisheries impacts and ecosystem representation within Marine Protected Areas on the Kerguelen Plateau

Citation

Subramaniam, RC and Corney, SP and Melbourne-Thomas, J and Peron, C and Ziegler, P and Swadling, KM, Spatially explicit food web modelling to consider fisheries impacts and ecosystem representation within Marine Protected Areas on the Kerguelen Plateau, ICES Journal of Marine Science, 79, (4) pp. 1327-1339. ISSN 1054-3139 (2022) [Refereed Article]


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DOI: doi:10.1093/icesjms/fsac056

Abstract

The Kerguelen Plateau in the Indian sector of the Southern Ocean is a highly dynamic region for Southern Ocean ecosystems and an important region for the Patagonian toothfish fishery. Fished regions overlap with foraging regions for predators; however, no study has explored the spatial impacts of fishing on ecosystem dynamics. We developed two spatially explicit ecosystem models to (i) explore the spatial effects of fishing on the Patagonian toothfish and the ecosystem in scenarios with and without fishing; and (ii) use modelled distributions to compare ecosystem representation in Marine Protected Areas (MPAs) with existing studies. Consistent with other studies, we found decreases in Patagonian toothfish biomass in scenarios with fishing activity. In contrast, we found no spatial fishing impacts on ecosystem interactions. A majority of functional group distributions were positively correlated with phytoplankton and well distributed within no-take areas. This could indicate a high level of representation of species in MPAs. Our study provides valuable insights into spatial ecosystem dynamics on the Kerguelen Plateau; however, our interpretations were limited and more research is needed to disentangle the natural variation from fishing impacts and further explore spatio-temporal changes in phytoplankton on the ecosystem.

Item Details

Item Type:Refereed Article
Keywords:ecospace, ecosystem-based management, fishing, Kerguelen Plateau, no-take area, Patagonian toothfish, Southern Ocean, spatial ecosystem model
Research Division:Environmental Sciences
Research Group:Ecological applications
Research Field:Ecosystem function
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Subramaniam, RC (Miss Roshni Subramaniam)
UTAS Author:Corney, SP (Dr Stuart Corney)
UTAS Author:Melbourne-Thomas, J (Dr Jessica Melbourne-Thomas)
UTAS Author:Ziegler, P (Dr Philippe Ziegler)
UTAS Author:Swadling, KM (Associate Professor Kerrie Swadling)
ID Code:150409
Year Published:2022
Deposited By:Oceans and Cryosphere
Deposited On:2022-06-14
Last Modified:2022-06-14
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