Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution
Understanding how predator foraging behaviour is influenced by the distribution and abundance of prey is a fundamental challenge in marine foraging ecology. This is particularly relevant in Southern Ocean ecosystems where the relationships between select predator species and Antarctic krill (Euphaus...
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2023
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Online Access: | https://doi.org/10.3389/fmars.2023.1060984 https://doaj.org/article/78d1c879bc74416680455073791f05d0 |
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ftdoajarticles:oai:doaj.org/article:78d1c879bc74416680455073791f05d0 2023-05-15T13:31:45+02:00 Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution Javed Riaz Sophie Bestley Simon Wotherspoon Martin J. Cox Louise Emmerson 2023-01-01T00:00:00Z https://doi.org/10.3389/fmars.2023.1060984 https://doaj.org/article/78d1c879bc74416680455073791f05d0 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2023.1060984/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1060984 https://doaj.org/article/78d1c879bc74416680455073791f05d0 Frontiers in Marine Science, Vol 10 (2023) foraging behaviour Pygoscelis adeliae Euphausia superba krill swarm dive behaviour predator-prey Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2023 ftdoajarticles https://doi.org/10.3389/fmars.2023.1060984 2023-01-29T01:27:22Z Understanding how predator foraging behaviour is influenced by the distribution and abundance of prey is a fundamental challenge in marine foraging ecology. This is particularly relevant in Southern Ocean ecosystems where the relationships between select predator species and Antarctic krill (Euphausia superba) can inform ecosystem conservation and precautionary fisheries management. In this study, we examine the spatial associations between krill swarm characteristics and Adélie penguin (Pygoscelis adeliae) foraging effort at Béchervaise Island, a long-term monitoring site in East Antarctica. Spatially integrating two years of regional-scale krill acoustic data with contemporaneous horizontal and vertical movement information from chick-rearing adult Adélie penguins, we assessed how penguin foraging effort changed in relation to krill swarm abundance and distribution across the survey area. Our findings show that penguin diving effort was focused in areas with a high number of krill swarms, yet they did not focus their effort in areas with high krill biomass. These results suggest the spatial organisation of Adélie penguin foraging effort can provide an indication of krill presence (and/or availability) but may not reflect krill abundance. We discuss our results in the context of penguin foraging strategies, capturing single krill within the water column rather than the engulfment feeding strategy of larger marine mammals such as whales. Our work substantially improves understanding of penguin-krill dynamics in East Antarctica and provides a greater level of nuance regarding the utility of Adélie penguins as indicator species under CCAMLR’s Ecosystem Monitoring Programme (CEMP). Understanding these predator-prey linkages will become increasingly important for managing any expanding krill fisheries in the region or changes in the prey field under future climate change scenarios. Thus, our results can be interpreted alongside other ecological indicators to support management of the East Antarctic sector of the ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Béchervaise Island East Antarctica Euphausia superba Pygoscelis adeliae Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean East Antarctica Béchervaise Island ENVELOPE(62.818,62.818,-67.591,-67.591) Frontiers in Marine Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
foraging behaviour Pygoscelis adeliae Euphausia superba krill swarm dive behaviour predator-prey Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
foraging behaviour Pygoscelis adeliae Euphausia superba krill swarm dive behaviour predator-prey Science Q General. Including nature conservation geographical distribution QH1-199.5 Javed Riaz Sophie Bestley Simon Wotherspoon Martin J. Cox Louise Emmerson Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
topic_facet |
foraging behaviour Pygoscelis adeliae Euphausia superba krill swarm dive behaviour predator-prey Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Understanding how predator foraging behaviour is influenced by the distribution and abundance of prey is a fundamental challenge in marine foraging ecology. This is particularly relevant in Southern Ocean ecosystems where the relationships between select predator species and Antarctic krill (Euphausia superba) can inform ecosystem conservation and precautionary fisheries management. In this study, we examine the spatial associations between krill swarm characteristics and Adélie penguin (Pygoscelis adeliae) foraging effort at Béchervaise Island, a long-term monitoring site in East Antarctica. Spatially integrating two years of regional-scale krill acoustic data with contemporaneous horizontal and vertical movement information from chick-rearing adult Adélie penguins, we assessed how penguin foraging effort changed in relation to krill swarm abundance and distribution across the survey area. Our findings show that penguin diving effort was focused in areas with a high number of krill swarms, yet they did not focus their effort in areas with high krill biomass. These results suggest the spatial organisation of Adélie penguin foraging effort can provide an indication of krill presence (and/or availability) but may not reflect krill abundance. We discuss our results in the context of penguin foraging strategies, capturing single krill within the water column rather than the engulfment feeding strategy of larger marine mammals such as whales. Our work substantially improves understanding of penguin-krill dynamics in East Antarctica and provides a greater level of nuance regarding the utility of Adélie penguins as indicator species under CCAMLR’s Ecosystem Monitoring Programme (CEMP). Understanding these predator-prey linkages will become increasingly important for managing any expanding krill fisheries in the region or changes in the prey field under future climate change scenarios. Thus, our results can be interpreted alongside other ecological indicators to support management of the East Antarctic sector of the ... |
format |
Article in Journal/Newspaper |
author |
Javed Riaz Sophie Bestley Simon Wotherspoon Martin J. Cox Louise Emmerson |
author_facet |
Javed Riaz Sophie Bestley Simon Wotherspoon Martin J. Cox Louise Emmerson |
author_sort |
Javed Riaz |
title |
Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
title_short |
Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
title_full |
Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
title_fullStr |
Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
title_full_unstemmed |
Spatial link between Adélie penguin foraging effort and krill swarm abundance and distribution |
title_sort |
spatial link between adélie penguin foraging effort and krill swarm abundance and distribution |
publisher |
Frontiers Media S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fmars.2023.1060984 https://doaj.org/article/78d1c879bc74416680455073791f05d0 |
long_lat |
ENVELOPE(62.818,62.818,-67.591,-67.591) |
geographic |
Antarctic Southern Ocean East Antarctica Béchervaise Island |
geographic_facet |
Antarctic Southern Ocean East Antarctica Béchervaise Island |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Béchervaise Island East Antarctica Euphausia superba Pygoscelis adeliae Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Béchervaise Island East Antarctica Euphausia superba Pygoscelis adeliae Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 10 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2023.1060984/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1060984 https://doaj.org/article/78d1c879bc74416680455073791f05d0 |
op_doi |
https://doi.org/10.3389/fmars.2023.1060984 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
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1766020662905798656 |