Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions
International audience Upper trophic level responses to changes in lower trophic level composition and production were compared for the US-GLOBEC study regions in the Southern Ocean (SO), Northern California Current (NCC), coastal Gulf of Alaska (CGoA), and Georges Bank (GB). Similarly structured en...
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ftunivaixmarseil:oai:HAL:hal-00950750v1 2023-12-31T10:23:18+01:00 Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions Ballerini, Tosca Ruzicka, J.J. Gaichas, S. Steele, J. H. Collie, 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) Salt Lake City, Utah, United States 2012-02-20 https://hal.science/hal-00950750 en eng HAL CCSD hal-00950750 https://hal.science/hal-00950750 Ocean Sciences Meeting https://hal.science/hal-00950750 Ocean Sciences Meeting, Feb 2012, Salt Lake City, Utah, United States [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems info:eu-repo/semantics/conferenceObject Conference papers 2012 ftunivaixmarseil 2023-12-05T23:34:06Z International audience Upper trophic level responses to changes in lower trophic level composition and production were compared for the US-GLOBEC study regions in the Southern Ocean (SO), Northern California Current (NCC), coastal Gulf of Alaska (CGoA), and Georges Bank (GB). Similarly structured end-to-end food web models were used to investigate effects on vertebrate predator production of hypothesized future predominance of smaller phytoplankton and zooplankton functional groups in response to climate change. Simulations include: increased small (< 20 μm) vs large (>20 μm) phytoplankton production; increased microzooplankton production at competitive expense to other zooplankton grazers; and reduced euphausiid production with surplus phytoplankton production benefiting copepods and gelatinous zooplankton. Changes in phytoplankton groups had greatest impact on SO top predator production while changes in microzooplankton had greatest effect on GB vertebrate predators. Reduced euphausiid production affected upper trophic level production in SO, NCC and CGoA but not in GB where euphausiids contribute little to vertebrate production. All regions showed large potential impacts from changes in the plankton assemblage size composition. Conference Object Southern Ocean Alaska Copepods Aix-Marseille Université: HAL |
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Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
ftunivaixmarseil |
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 Ruzicka, J.J. Gaichas, S. Steele, J. H. Collie, J. Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
topic_facet |
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
description |
International audience Upper trophic level responses to changes in lower trophic level composition and production were compared for the US-GLOBEC study regions in the Southern Ocean (SO), Northern California Current (NCC), coastal Gulf of Alaska (CGoA), and Georges Bank (GB). Similarly structured end-to-end food web models were used to investigate effects on vertebrate predator production of hypothesized future predominance of smaller phytoplankton and zooplankton functional groups in response to climate change. Simulations include: increased small (< 20 μm) vs large (>20 μm) phytoplankton production; increased microzooplankton production at competitive expense to other zooplankton grazers; and reduced euphausiid production with surplus phytoplankton production benefiting copepods and gelatinous zooplankton. Changes in phytoplankton groups had greatest impact on SO top predator production while changes in microzooplankton had greatest effect on GB vertebrate predators. Reduced euphausiid production affected upper trophic level production in SO, NCC and CGoA but not in GB where euphausiids contribute little to vertebrate production. All regions showed large potential impacts from changes in the plankton assemblage size composition. |
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 Ruzicka, J.J. Gaichas, S. Steele, J. H. Collie, J. |
author_facet |
Ballerini, Tosca Ruzicka, J.J. Gaichas, S. Steele, J. H. Collie, J. |
author_sort |
Ballerini, Tosca |
title |
Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
title_short |
Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
title_full |
Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
title_fullStr |
Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
title_full_unstemmed |
Comparisons of lower and upper trophic level responses to modifications in four US-GLOBEC study regions |
title_sort |
comparisons of lower and upper trophic level responses to modifications in four us-globec study regions |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00950750 |
op_coverage |
Salt Lake City, Utah, United States |
genre |
Southern Ocean Alaska Copepods |
genre_facet |
Southern Ocean Alaska Copepods |
op_source |
Ocean Sciences Meeting https://hal.science/hal-00950750 Ocean Sciences Meeting, Feb 2012, Salt Lake City, Utah, United States |
op_relation |
hal-00950750 https://hal.science/hal-00950750 |
_version_ |
1786834836746403840 |