Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula
To assess krill aggregations and humpback whale Megaptera novaeangliae foraging behavior, spatial and temporal relationships between Antarctic krill Euphausia superba and zooplankton taxonomic groups were studied during an interdisciplinary cruise conducted in May and June 2009 within Wilhelmina Bay...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
|
Subjects: | |
Online Access: | https://doi.org/10.3354/meps09626 https://hal.archives-ouvertes.fr/hal-00745295/file/m452p063.pdf https://hal.archives-ouvertes.fr/hal-00745295 |
id |
fttriple:oai:gotriple.eu:10670/1.z66a0g |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.z66a0g 2023-05-15T13:53:03+02:00 Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula ESPINASSE, Boris ZHOU, Meng Zhu, Yiwu Hazen, Elliott L. Friedlaender, Ari S. Nowacek, Douglas P. Chu, Dezhang CARLOTTI, Francois 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)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) University of Massachusetts Amherst (UMass Amherst) University of Massachusetts System (UMASS) 2012-01-01 https://doi.org/10.3354/meps09626 https://hal.archives-ouvertes.fr/hal-00745295/file/m452p063.pdf https://hal.archives-ouvertes.fr/hal-00745295 en eng HAL CCSD Inter Research hal-00745295 doi:10.3354/meps09626 10670/1.z66a0g https://hal.archives-ouvertes.fr/hal-00745295/file/m452p063.pdf https://hal.archives-ouvertes.fr/hal-00745295 lic_creative-commons Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series Marine Ecology Progress Series, Inter Research, 2012, 452, pp.63-80. ⟨10.3354/meps09626⟩ Antarctic Peninsula Chlorophyll Zooplankton Krill Food web Austral fall geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2012 fttriple https://doi.org/10.3354/meps09626 2023-01-22T16:35:24Z To assess krill aggregations and humpback whale Megaptera novaeangliae foraging behavior, spatial and temporal relationships between Antarctic krill Euphausia superba and zooplankton taxonomic groups were studied during an interdisciplinary cruise conducted in May and June 2009 within Wilhelmina Bay on the western side of the Antarctic Peninsula. A vesselmounted acoustic Doppler current profiler (ADCP) and a calibrated EK-60 echo sounder were used to assess circulation patterns and krill distributions in the bay, and a multiple opening and closing net (with 333 μm mesh) and environmental sensing system (MOCNESS) was used to collect live samples of mesozooplankton and krill for taxonomic composition analysis. The results from this field study complement a previous one that examined an anticyclonic bay-scale circulation of Antarctic krill. This super-aggregation of krill covered ~100 km2, had a concentration of 1000s of individuals m-2 and was associated with more than 306 humpback whales present in Wilhelmina Bay. Our results from the mesozooplankton study revealed that krill continuously conducted diel vertical migrations and formed aggregations in the inner bay, while the chlorophyll concentration at the surface decreased from 2.2 to 0.6 g C m−2 due to the decrease of daylight, and zooplankton concentrations increased from 0.5 to 1.5 g C m−2 probably from advective influx. Most zooplankton were distributed below 200 m while krill fed in the upper 150 m. The spatial and temporal correlations between krill and small- to medium-sized mesozooplankton imply that krill may become omnivorous when there is a lack of phytoplankton in the late austral fall. Though both phytoplankton and zooplankton biomasses contributed only small fractions of the daily ration needed for krill metabolism in Wilhelmina Bay, it is not clear what caused krill to aggregate on such a large scale, as this led to high mortality as a result of starvation and predation by whales and other top predators. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Humpback Whale Megaptera novaeangliae Unknown Antarctic Antarctic Peninsula Austral Inner Bay ENVELOPE(-37.967,-37.967,-54.017,-54.017) The Antarctic Wilhelmina ENVELOPE(-62.160,-62.160,-64.642,-64.642) Wilhelmina Bay ENVELOPE(-62.160,-62.160,-64.642,-64.642) Marine Ecology Progress Series 452 63 80 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Antarctic Peninsula Chlorophyll Zooplankton Krill Food web Austral fall geo envir |
spellingShingle |
Antarctic Peninsula Chlorophyll Zooplankton Krill Food web Austral fall geo envir ESPINASSE, Boris ZHOU, Meng Zhu, Yiwu Hazen, Elliott L. Friedlaender, Ari S. Nowacek, Douglas P. Chu, Dezhang CARLOTTI, Francois Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
topic_facet |
Antarctic Peninsula Chlorophyll Zooplankton Krill Food web Austral fall geo envir |
description |
To assess krill aggregations and humpback whale Megaptera novaeangliae foraging behavior, spatial and temporal relationships between Antarctic krill Euphausia superba and zooplankton taxonomic groups were studied during an interdisciplinary cruise conducted in May and June 2009 within Wilhelmina Bay on the western side of the Antarctic Peninsula. A vesselmounted acoustic Doppler current profiler (ADCP) and a calibrated EK-60 echo sounder were used to assess circulation patterns and krill distributions in the bay, and a multiple opening and closing net (with 333 μm mesh) and environmental sensing system (MOCNESS) was used to collect live samples of mesozooplankton and krill for taxonomic composition analysis. The results from this field study complement a previous one that examined an anticyclonic bay-scale circulation of Antarctic krill. This super-aggregation of krill covered ~100 km2, had a concentration of 1000s of individuals m-2 and was associated with more than 306 humpback whales present in Wilhelmina Bay. Our results from the mesozooplankton study revealed that krill continuously conducted diel vertical migrations and formed aggregations in the inner bay, while the chlorophyll concentration at the surface decreased from 2.2 to 0.6 g C m−2 due to the decrease of daylight, and zooplankton concentrations increased from 0.5 to 1.5 g C m−2 probably from advective influx. Most zooplankton were distributed below 200 m while krill fed in the upper 150 m. The spatial and temporal correlations between krill and small- to medium-sized mesozooplankton imply that krill may become omnivorous when there is a lack of phytoplankton in the late austral fall. Though both phytoplankton and zooplankton biomasses contributed only small fractions of the daily ration needed for krill metabolism in Wilhelmina Bay, it is not clear what caused krill to aggregate on such a large scale, as this led to high mortality as a result of starvation and predation by whales and other top predators. |
author2 |
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)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) University of Massachusetts Amherst (UMass Amherst) University of Massachusetts System (UMASS) |
format |
Article in Journal/Newspaper |
author |
ESPINASSE, Boris ZHOU, Meng Zhu, Yiwu Hazen, Elliott L. Friedlaender, Ari S. Nowacek, Douglas P. Chu, Dezhang CARLOTTI, Francois |
author_facet |
ESPINASSE, Boris ZHOU, Meng Zhu, Yiwu Hazen, Elliott L. Friedlaender, Ari S. Nowacek, Douglas P. Chu, Dezhang CARLOTTI, Francois |
author_sort |
ESPINASSE, Boris |
title |
Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
title_short |
Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
title_full |
Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
title_fullStr |
Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
title_full_unstemmed |
Austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the Antarctic Peninsula |
title_sort |
austral fall-winter transition of mesozooplankton assemblages and krill aggregations in an embayment west of the antarctic peninsula |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://doi.org/10.3354/meps09626 https://hal.archives-ouvertes.fr/hal-00745295/file/m452p063.pdf https://hal.archives-ouvertes.fr/hal-00745295 |
long_lat |
ENVELOPE(-37.967,-37.967,-54.017,-54.017) ENVELOPE(-62.160,-62.160,-64.642,-64.642) ENVELOPE(-62.160,-62.160,-64.642,-64.642) |
geographic |
Antarctic Antarctic Peninsula Austral Inner Bay The Antarctic Wilhelmina Wilhelmina Bay |
geographic_facet |
Antarctic Antarctic Peninsula Austral Inner Bay The Antarctic Wilhelmina Wilhelmina Bay |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Humpback Whale Megaptera novaeangliae |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Humpback Whale Megaptera novaeangliae |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series Marine Ecology Progress Series, Inter Research, 2012, 452, pp.63-80. ⟨10.3354/meps09626⟩ |
op_relation |
hal-00745295 doi:10.3354/meps09626 10670/1.z66a0g https://hal.archives-ouvertes.fr/hal-00745295/file/m452p063.pdf https://hal.archives-ouvertes.fr/hal-00745295 |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.3354/meps09626 |
container_title |
Marine Ecology Progress Series |
container_volume |
452 |
container_start_page |
63 |
op_container_end_page |
80 |
_version_ |
1766258010459471872 |