A generic model for Antarctic marine food webs: a tool for data summary and scenario testing
International audience Understanding the functioning of Antarctic marine ecosystems and projecting their possible responses to environmental drivers require analysis of extensive data sets, mathematical models to integrate these data, and assessment of data uncertainty on the model projections. In t...
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ftinsu:oai:HAL:hal-00950747v1 2023-12-31T10:00:42+01:00 A generic model for Antarctic marine food webs: a tool for data summary and scenario testing Ballerini, Tosca Hill, S. H. Hofmann, E. E. Murphy, E. J. 5 Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Barcelona, Spain 2013-07-16 https://hal.science/hal-00950747 en eng HAL CCSD hal-00950747 https://hal.science/hal-00950747 SCAR Biology Symposium https://hal.science/hal-00950747 SCAR Biology Symposium, Jul 2013, Barcelona, Spain [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems info:eu-repo/semantics/conferenceObject Conference papers 2013 ftinsu 2023-12-06T17:22:25Z International audience Understanding the functioning of Antarctic marine ecosystems and projecting their possible responses to environmental drivers require analysis of extensive data sets, mathematical models to integrate these data, and assessment of data uncertainty on the model projections. In this study, a generic food web model with 22 trophic groups was used to describe the structure and functioning of two Antarctic marine food webs that are representative of a region with heavy sea ice (southern region of the Western Antarctic Peninsula, sWAP) and one with little sea ice (South Georgia, SG). For each food web, ecosystem metrics were calculated using Monte Carlo methods that take into account uncertainty in the data used to define model parameters. Common scenario simulations were used to investigate possible changes in the structure of these food webs to changes in sea ice extent and biomass of dominant food web components. The uncertainty associated with data sets from the two regions was similar, average sWAP CV = 0.5 and average SG CV = 0.46. In both systems, microzooplankton consume 2 times more small phytoplankton production than large phytoplankton production, while mesozooplankton and macrozooplankton consume 3 times more large phytoplankton production. Overall, the microbial part of the food web consumes a large percentage of the primary production in both systems (68% in sWAP and 46% +- 16 in SG), suggesting that improved definition of these processes is needed. Simulations show that a reduction in Antarctic krill (Euphausia superba) biomass corresponds to an almost linear reduction in the biomass of top predator (penguins, crabeater seals, baleen whales) biomass in both systems (coefficient of correlation = 0.90). This result is in agreement with common understanding of the importance of Antarctic krill as diet component for top predators. Simulated shifts from large to small phytoplankton caused decreases in top predator production in the sWAP (coefficient of correlation = 0.82) but not at ... Conference Object Antarc* Antarctic Antarctic Krill Antarctic Peninsula baleen whales Crabeater Seals Euphausia superba Sea ice Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
spellingShingle |
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems Ballerini, Tosca Hill, S. H. Hofmann, E. E. Murphy, E. J. A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
topic_facet |
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
description |
International audience Understanding the functioning of Antarctic marine ecosystems and projecting their possible responses to environmental drivers require analysis of extensive data sets, mathematical models to integrate these data, and assessment of data uncertainty on the model projections. In this study, a generic food web model with 22 trophic groups was used to describe the structure and functioning of two Antarctic marine food webs that are representative of a region with heavy sea ice (southern region of the Western Antarctic Peninsula, sWAP) and one with little sea ice (South Georgia, SG). For each food web, ecosystem metrics were calculated using Monte Carlo methods that take into account uncertainty in the data used to define model parameters. Common scenario simulations were used to investigate possible changes in the structure of these food webs to changes in sea ice extent and biomass of dominant food web components. The uncertainty associated with data sets from the two regions was similar, average sWAP CV = 0.5 and average SG CV = 0.46. In both systems, microzooplankton consume 2 times more small phytoplankton production than large phytoplankton production, while mesozooplankton and macrozooplankton consume 3 times more large phytoplankton production. Overall, the microbial part of the food web consumes a large percentage of the primary production in both systems (68% in sWAP and 46% +- 16 in SG), suggesting that improved definition of these processes is needed. Simulations show that a reduction in Antarctic krill (Euphausia superba) biomass corresponds to an almost linear reduction in the biomass of top predator (penguins, crabeater seals, baleen whales) biomass in both systems (coefficient of correlation = 0.90). This result is in agreement with common understanding of the importance of Antarctic krill as diet component for top predators. Simulated shifts from large to small phytoplankton caused decreases in top predator production in the sWAP (coefficient of correlation = 0.82) but not at ... |
author2 |
5 Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Ballerini, Tosca Hill, S. H. Hofmann, E. E. Murphy, E. J. |
author_facet |
Ballerini, Tosca Hill, S. H. Hofmann, E. E. Murphy, E. J. |
author_sort |
Ballerini, Tosca |
title |
A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
title_short |
A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
title_full |
A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
title_fullStr |
A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
title_full_unstemmed |
A generic model for Antarctic marine food webs: a tool for data summary and scenario testing |
title_sort |
generic model for antarctic marine food webs: a tool for data summary and scenario testing |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-00950747 |
op_coverage |
Barcelona, Spain |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula baleen whales Crabeater Seals Euphausia superba Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula baleen whales Crabeater Seals Euphausia superba Sea ice |
op_source |
SCAR Biology Symposium https://hal.science/hal-00950747 SCAR Biology Symposium, Jul 2013, Barcelona, Spain |
op_relation |
hal-00950747 https://hal.science/hal-00950747 |
_version_ |
1786790111227150336 |