Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica
Abstract The Palmer Deep canyon along the West Antarctic Peninsula is a biological hotspot with abundant phytoplankton and krill supporting Adélie and gentoo penguin rookeries at the canyon head. Nearshore studies have focused on physical mechanisms driving primary production and penguin foraging, b...
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crwiley:10.1002/lno.11750 2024-09-15T17:47:24+00:00 Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica Nardelli, Schuyler C. Cimino, Megan A. Conroy, John A. Fraser, William R. Steinberg, Deborah K. Schofield, Oscar Office of Polar Programs 2021 http://dx.doi.org/10.1002/lno.11750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11750 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11750 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 66, issue 6, page 2234-2250 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11750 2024-08-01T04:20:51Z Abstract The Palmer Deep canyon along the West Antarctic Peninsula is a biological hotspot with abundant phytoplankton and krill supporting Adélie and gentoo penguin rookeries at the canyon head. Nearshore studies have focused on physical mechanisms driving primary production and penguin foraging, but less is known about finer‐scale krill distribution and density. We designed two acoustic survey grids paired with conductivity–temperature–depth profiles within adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica. The grids were sampled from January to March 2019 to assess variability in krill availability and associations with oceanographic properties. Krill density was similar in the two regions, but krill swarms were longer and larger in the gentoo foraging region, which was also less stratified and had lower chlorophyll concentrations. In the inshore zone near penguin colonies, depth‐integrated krill density increased from summer to autumn (January–March) independent of chlorophyll concentration, suggesting a life history‐driven adult krill migration rather than a resource‐driven biomass increase. The daytime depth of krill biomass deepened through the summer and became decoupled from the chlorophyll maximum in March as diel vertical migration magnitude likely increased. Penguins near Palmer Station did not appear to be limited by krill availability during our study, and regional differences in krill depth match the foraging behaviors of the two penguin species. Understanding fine‐scale physical forcing and ecological interactions in coastal Antarctic hotspots is critical for predicting how environmental change will impact these ecosystems. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Gentoo penguin Wiley Online Library Limnology and Oceanography 66 6 2234 2250 |
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English |
description |
Abstract The Palmer Deep canyon along the West Antarctic Peninsula is a biological hotspot with abundant phytoplankton and krill supporting Adélie and gentoo penguin rookeries at the canyon head. Nearshore studies have focused on physical mechanisms driving primary production and penguin foraging, but less is known about finer‐scale krill distribution and density. We designed two acoustic survey grids paired with conductivity–temperature–depth profiles within adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica. The grids were sampled from January to March 2019 to assess variability in krill availability and associations with oceanographic properties. Krill density was similar in the two regions, but krill swarms were longer and larger in the gentoo foraging region, which was also less stratified and had lower chlorophyll concentrations. In the inshore zone near penguin colonies, depth‐integrated krill density increased from summer to autumn (January–March) independent of chlorophyll concentration, suggesting a life history‐driven adult krill migration rather than a resource‐driven biomass increase. The daytime depth of krill biomass deepened through the summer and became decoupled from the chlorophyll maximum in March as diel vertical migration magnitude likely increased. Penguins near Palmer Station did not appear to be limited by krill availability during our study, and regional differences in krill depth match the foraging behaviors of the two penguin species. Understanding fine‐scale physical forcing and ecological interactions in coastal Antarctic hotspots is critical for predicting how environmental change will impact these ecosystems. |
author2 |
Office of Polar Programs |
format |
Article in Journal/Newspaper |
author |
Nardelli, Schuyler C. Cimino, Megan A. Conroy, John A. Fraser, William R. Steinberg, Deborah K. Schofield, Oscar |
spellingShingle |
Nardelli, Schuyler C. Cimino, Megan A. Conroy, John A. Fraser, William R. Steinberg, Deborah K. Schofield, Oscar Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
author_facet |
Nardelli, Schuyler C. Cimino, Megan A. Conroy, John A. Fraser, William R. Steinberg, Deborah K. Schofield, Oscar |
author_sort |
Nardelli, Schuyler C. |
title |
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
title_short |
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
title_full |
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
title_fullStr |
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
title_full_unstemmed |
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica |
title_sort |
krill availability in adjacent adélie and gentoo penguin foraging regions near palmer station, antarctica |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11750 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11750 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Gentoo penguin |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Gentoo penguin |
op_source |
Limnology and Oceanography volume 66, issue 6, page 2234-2250 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11750 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
6 |
container_start_page |
2234 |
op_container_end_page |
2250 |
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1810496685624786944 |