Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications
As Antarctic fish species experience increasing anthropogenic pressures there is a growing need to characterise the structure and function of their populations and understand how they may respond to changes in their environment. We integrated fishery-dependent and environmental data from years 20032...
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Online Access: | https://doi.org/10.1016/j.fishres.2019.105338 http://ecite.utas.edu.au/134518 |
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ftunivtasecite:oai:ecite.utas.edu.au:134518 2023-05-15T13:55:18+02:00 Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications Yates, P Ziegler, P Welsford, D Wotherspoon, S Burch, P Maschette, D 2019 https://doi.org/10.1016/j.fishres.2019.105338 http://ecite.utas.edu.au/134518 en eng Elsevier Science Bv http://dx.doi.org/10.1016/j.fishres.2019.105338 Yates, P and Ziegler, P and Welsford, D and Wotherspoon, S and Burch, P and Maschette, D, Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications, Fisheries Research, 219 Article 105338. ISSN 0165-7836 (2019) [Refereed Article] http://ecite.utas.edu.au/134518 Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1016/j.fishres.2019.105338 2020-05-25T22:16:19Z As Antarctic fish species experience increasing anthropogenic pressures there is a growing need to characterise the structure and function of their populations and understand how they may respond to changes in their environment. We integrated fishery-dependent and environmental data from years 20032017 to investigate the distribution of Antarctic toothfish Dissostichus mawsoni along a c. 3000 nm expanse of the shelf and slope along East Antarctica (30150 E). Spatially-explicit generalised additive mixed models were used to characterise the environmental drivers of relative abundance, mean individual weight, maturity-stage composition and sex ratio. Antarctic toothfish were not randomly distributed across the region, and spatial variations were characterised by complex relationships involving topography, temperature, salinity and sea ice. In particular, catch rates were highest at depths between 10001700 m. Mean weight and the proportion of fish that were mature both increased with depth and decreased with bottom temperature. Model predictions were also used to develop hypotheses relating to population function, including the location of nursery and spawning areas. This characterisation of the population can facilitate evaluation of fishing impacts in East Antarctica, and improve our understanding of the role of toothfish in Antarctic and Southern Ocean ecosystems. Article in Journal/Newspaper Antarc* Antarctic Antarctic Toothfish Antarctica East Antarctica Sea ice Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean East Antarctica Fisheries Research 219 105338 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management |
spellingShingle |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management Yates, P Ziegler, P Welsford, D Wotherspoon, S Burch, P Maschette, D Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
topic_facet |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management |
description |
As Antarctic fish species experience increasing anthropogenic pressures there is a growing need to characterise the structure and function of their populations and understand how they may respond to changes in their environment. We integrated fishery-dependent and environmental data from years 20032017 to investigate the distribution of Antarctic toothfish Dissostichus mawsoni along a c. 3000 nm expanse of the shelf and slope along East Antarctica (30150 E). Spatially-explicit generalised additive mixed models were used to characterise the environmental drivers of relative abundance, mean individual weight, maturity-stage composition and sex ratio. Antarctic toothfish were not randomly distributed across the region, and spatial variations were characterised by complex relationships involving topography, temperature, salinity and sea ice. In particular, catch rates were highest at depths between 10001700 m. Mean weight and the proportion of fish that were mature both increased with depth and decreased with bottom temperature. Model predictions were also used to develop hypotheses relating to population function, including the location of nursery and spawning areas. This characterisation of the population can facilitate evaluation of fishing impacts in East Antarctica, and improve our understanding of the role of toothfish in Antarctic and Southern Ocean ecosystems. |
format |
Article in Journal/Newspaper |
author |
Yates, P Ziegler, P Welsford, D Wotherspoon, S Burch, P Maschette, D |
author_facet |
Yates, P Ziegler, P Welsford, D Wotherspoon, S Burch, P Maschette, D |
author_sort |
Yates, P |
title |
Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
title_short |
Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
title_full |
Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
title_fullStr |
Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
title_full_unstemmed |
Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications |
title_sort |
distribution of antarctic toothfish dissostichus mawsoni along east antarctica: environmental drivers and management implications |
publisher |
Elsevier Science Bv |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.fishres.2019.105338 http://ecite.utas.edu.au/134518 |
geographic |
Antarctic Southern Ocean East Antarctica |
geographic_facet |
Antarctic Southern Ocean East Antarctica |
genre |
Antarc* Antarctic Antarctic Toothfish Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Toothfish Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
http://dx.doi.org/10.1016/j.fishres.2019.105338 Yates, P and Ziegler, P and Welsford, D and Wotherspoon, S and Burch, P and Maschette, D, Distribution of Antarctic toothfish Dissostichus mawsoni along East Antarctica: environmental drivers and management implications, Fisheries Research, 219 Article 105338. ISSN 0165-7836 (2019) [Refereed Article] http://ecite.utas.edu.au/134518 |
op_doi |
https://doi.org/10.1016/j.fishres.2019.105338 |
container_title |
Fisheries Research |
container_volume |
219 |
container_start_page |
105338 |
_version_ |
1766261722179436544 |