Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model

In the Southern Ocean, Antarctic krill Euphausia superba are the dominant prey item for many predators, and a changing climate may affect the biomass of krill available to both predators and the krill fishery. We projected growth trajectories for individual krill within cohorts and estimated how tot...

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Published in:Marine Ecology Progress Series
Main Authors: Wiedenmann, J, Cresswell, K, Mangel, M
Format: Article in Journal/Newspaper
Language:English
Published: Inter-Research 2008
Subjects:
Online Access:https://doi.org/10.3354/meps07350
http://ecite.utas.edu.au/131157
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author Wiedenmann, J
Cresswell, K
Mangel, M
author_facet Wiedenmann, J
Cresswell, K
Mangel, M
author_sort Wiedenmann, J
collection Unknown
container_start_page 191
container_title Marine Ecology Progress Series
container_volume 358
description In the Southern Ocean, Antarctic krill Euphausia superba are the dominant prey item for many predators, and a changing climate may affect the biomass of krill available to both predators and the krill fishery. We projected growth trajectories for individual krill within cohorts and estimated how total biomass in an area available to both predators and the fishery may vary from year to year simply due to fluctuations in temperature. We used an existing temperature-dependent growth model and a time series of temperature data (1970 to 2004) for 2 regions in the Southern Ocean: (1) around the Antarctic Peninsula, and (2) around the island of South Georgia. The growth model predicted increasing individual size within a cohort (in terms of length and weight) with increasing temperature in the cooler Antarctic Peninsula region and decreasing individual size with increasing temperature in the warmer South Georgia region. Years with many cohorts of small individuals in the population resulted in biomass well below average, whereas years with many cohorts of large individuals resulted in biomass well above the average, suggesting that temporal changes in Southern Ocean temperatures may have profound effects on the total biomass in an area that is available to both predators and the fishery. Moreover, the effects of a potentially warming Southern Ocean on krill biomass will likely be more pronounced in the warmer regions occupied by krill.
format Article in Journal/Newspaper
genre Antarc*
Antarctic
Antarctic Krill
Antarctic Peninsula
Euphausia superba
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Krill
Antarctic Peninsula
Euphausia superba
Southern Ocean
geographic Antarctic
Antarctic Peninsula
Southern Ocean
The Antarctic
geographic_facet Antarctic
Antarctic Peninsula
Southern Ocean
The Antarctic
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institution Open Polar
language English
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op_doi https://doi.org/10.3354/meps07350
op_relation http://ecite.utas.edu.au/131157/1/Wiedenmann et al. 2008 (MEPS).pdf
http://dx.doi.org/10.3354/meps07350
Wiedenmann, J and Cresswell, K and Mangel, M, Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model, Marine Ecology - Progress Series, 358 pp. 191-202. ISSN 0171-8630 (2008) [Refereed Article]
http://ecite.utas.edu.au/131157
publishDate 2008
publisher Inter-Research
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spelling ftunivtasecite:oai:ecite.utas.edu.au:131157 2025-01-16T19:22:34+00:00 Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model Wiedenmann, J Cresswell, K Mangel, M 2008 application/pdf https://doi.org/10.3354/meps07350 http://ecite.utas.edu.au/131157 en eng Inter-Research http://ecite.utas.edu.au/131157/1/Wiedenmann et al. 2008 (MEPS).pdf http://dx.doi.org/10.3354/meps07350 Wiedenmann, J and Cresswell, K and Mangel, M, Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model, Marine Ecology - Progress Series, 358 pp. 191-202. ISSN 0171-8630 (2008) [Refereed Article] http://ecite.utas.edu.au/131157 Mathematical Sciences Applied Mathematics Biological Mathematics Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.3354/meps07350 2019-12-13T22:29:08Z In the Southern Ocean, Antarctic krill Euphausia superba are the dominant prey item for many predators, and a changing climate may affect the biomass of krill available to both predators and the krill fishery. We projected growth trajectories for individual krill within cohorts and estimated how total biomass in an area available to both predators and the fishery may vary from year to year simply due to fluctuations in temperature. We used an existing temperature-dependent growth model and a time series of temperature data (1970 to 2004) for 2 regions in the Southern Ocean: (1) around the Antarctic Peninsula, and (2) around the island of South Georgia. The growth model predicted increasing individual size within a cohort (in terms of length and weight) with increasing temperature in the cooler Antarctic Peninsula region and decreasing individual size with increasing temperature in the warmer South Georgia region. Years with many cohorts of small individuals in the population resulted in biomass well below average, whereas years with many cohorts of large individuals resulted in biomass well above the average, suggesting that temporal changes in Southern Ocean temperatures may have profound effects on the total biomass in an area that is available to both predators and the fishery. Moreover, the effects of a potentially warming Southern Ocean on krill biomass will likely be more pronounced in the warmer regions occupied by krill. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Southern Ocean Unknown Antarctic Antarctic Peninsula Southern Ocean The Antarctic Marine Ecology Progress Series 358 191 202
spellingShingle Mathematical Sciences
Applied Mathematics
Biological Mathematics
Wiedenmann, J
Cresswell, K
Mangel, M
Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title_full Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title_fullStr Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title_full_unstemmed Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title_short Temperature-dependent growth of Antarctic krill: predictions for a changing climate from a cohort model
title_sort temperature-dependent growth of antarctic krill: predictions for a changing climate from a cohort model
topic Mathematical Sciences
Applied Mathematics
Biological Mathematics
topic_facet Mathematical Sciences
Applied Mathematics
Biological Mathematics
url https://doi.org/10.3354/meps07350
http://ecite.utas.edu.au/131157