Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula
Polar zooplankton and fish safeguard against the seasonality of food availability by using the summer months to build large reserves of lipids, which in turn are utilized to meet the metabolic demands of apex predators such as penguins, seals, and whales. A warming trend in the northern part of the...
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ftwilliammarycol:oai:scholarworks.wm.edu:etd-3047 2023-06-11T04:05:36+02:00 Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula Ruck, Kate E. 2012-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/etd/1539617917 https://doi.org/10.25773/v5-e9fr-3p80 https://scholarworks.wm.edu/context/etd/article/3047/viewcontent/10632056.pdf English eng W&M ScholarWorks https://scholarworks.wm.edu/etd/1539617917 doi:doi:10.25773/v5-e9fr-3p80 https://scholarworks.wm.edu/context/etd/article/3047/viewcontent/10632056.pdf © The Author Dissertations, Theses, and Masters Projects Fresh Water Studies Marine Biology Oceanography text 2012 ftwilliammarycol https://doi.org/10.25773/v5-e9fr-3p80 2023-05-04T17:39:34Z Polar zooplankton and fish safeguard against the seasonality of food availability by using the summer months to build large reserves of lipids, which in turn are utilized to meet the metabolic demands of apex predators such as penguins, seals, and whales. A warming trend in the northern part of the western Antarctic Peninsula (WAP) has led to a decrease in perennial and summer sea ice, an increase in heat content over the shelf, and lower phytoplankton biomass, which could affect prey quality. We compared prey quality, including elemental (C, N) content and ratios, total, neutral, and polar lipid content, and energy densities, of known top-predator prey items (krill Euphaush1 superba, 17Jysanoessa macrura, and Euphausia crystallorophias; and fish Pleuragramma antarcticum, and Electrona antarctica) along the W AP latitudinal gradient in January of 2009-20 II as part of the Palmer Antarctica Long-Term Ecological Research study. E. antarctica had the highest prey quality in terms of total lipid content and energy density, followed by T. macrura and P. antarcticum, then E. c1ystallorophias and E. superba. For all species, variations in carbon and nitrogen content were best correlated with by the animals' neutral lipid content, in that animals with larger neutral lipid stores had significantly higher carbon and lower nitrogen content. Across all sexes and maturity stages, E. superba in the South had ca. 20% higher total lipid content than E. superba in the North. Total lipid content was also significantly higher in the South for E. crystallorophias, though this was largely due to the presence of larger individuals in the south combined with a significant positive relationship between length vs. weight-specific total lipid content for this species. For all prey species except T. macrura, there was a positive relationship between latitude or 0-120 m integrated Chi a vs. lipid content (neutral, polar, or total lipids), and a negative relationship between 0-120 m mean water temperature vs. lipid content. Trends opposite ... Text Antarc* Antarctic Antarctic Peninsula Antarctica E. Antarctica Sea ice W&M ScholarWorks Antarctic Antarctic Peninsula |
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Open Polar |
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W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
English |
topic |
Fresh Water Studies Marine Biology Oceanography |
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Fresh Water Studies Marine Biology Oceanography Ruck, Kate E. Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
topic_facet |
Fresh Water Studies Marine Biology Oceanography |
description |
Polar zooplankton and fish safeguard against the seasonality of food availability by using the summer months to build large reserves of lipids, which in turn are utilized to meet the metabolic demands of apex predators such as penguins, seals, and whales. A warming trend in the northern part of the western Antarctic Peninsula (WAP) has led to a decrease in perennial and summer sea ice, an increase in heat content over the shelf, and lower phytoplankton biomass, which could affect prey quality. We compared prey quality, including elemental (C, N) content and ratios, total, neutral, and polar lipid content, and energy densities, of known top-predator prey items (krill Euphaush1 superba, 17Jysanoessa macrura, and Euphausia crystallorophias; and fish Pleuragramma antarcticum, and Electrona antarctica) along the W AP latitudinal gradient in January of 2009-20 II as part of the Palmer Antarctica Long-Term Ecological Research study. E. antarctica had the highest prey quality in terms of total lipid content and energy density, followed by T. macrura and P. antarcticum, then E. c1ystallorophias and E. superba. For all species, variations in carbon and nitrogen content were best correlated with by the animals' neutral lipid content, in that animals with larger neutral lipid stores had significantly higher carbon and lower nitrogen content. Across all sexes and maturity stages, E. superba in the South had ca. 20% higher total lipid content than E. superba in the North. Total lipid content was also significantly higher in the South for E. crystallorophias, though this was largely due to the presence of larger individuals in the south combined with a significant positive relationship between length vs. weight-specific total lipid content for this species. For all prey species except T. macrura, there was a positive relationship between latitude or 0-120 m integrated Chi a vs. lipid content (neutral, polar, or total lipids), and a negative relationship between 0-120 m mean water temperature vs. lipid content. Trends opposite ... |
format |
Text |
author |
Ruck, Kate E. |
author_facet |
Ruck, Kate E. |
author_sort |
Ruck, Kate E. |
title |
Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
title_short |
Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
title_full |
Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
title_fullStr |
Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
title_full_unstemmed |
Interannual and Regional Differences in Krill and Fish Prey Quality along the Western Antarctic Peninsula |
title_sort |
interannual and regional differences in krill and fish prey quality along the western antarctic peninsula |
publisher |
W&M ScholarWorks |
publishDate |
2012 |
url |
https://scholarworks.wm.edu/etd/1539617917 https://doi.org/10.25773/v5-e9fr-3p80 https://scholarworks.wm.edu/context/etd/article/3047/viewcontent/10632056.pdf |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica E. Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica E. Antarctica Sea ice |
op_source |
Dissertations, Theses, and Masters Projects |
op_relation |
https://scholarworks.wm.edu/etd/1539617917 doi:doi:10.25773/v5-e9fr-3p80 https://scholarworks.wm.edu/context/etd/article/3047/viewcontent/10632056.pdf |
op_rights |
© The Author |
op_doi |
https://doi.org/10.25773/v5-e9fr-3p80 |
_version_ |
1768377140392230912 |