Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂).
Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO(2) concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balan...
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ftdoajarticles:oai:doaj.org/article:19c4d2395ecc4019aef640a4303993ce 2023-05-15T13:33:27+02:00 Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). Grace K Saba Oscar Schofield Joseph J Torres Erica H Ombres Deborah K Steinberg 2012-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0052224 https://doaj.org/article/19c4d2395ecc4019aef640a4303993ce EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3530562?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0052224 https://doaj.org/article/19c4d2395ecc4019aef640a4303993ce PLoS ONE, Vol 7, Iss 12, p e52224 (2012) Medicine R Science Q article 2012 ftdoajarticles https://doi.org/10.1371/journal.pone.0052224 2022-12-31T10:33:18Z Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO(2) concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance. We assessed feeding and nutrient excretion rates in natural populations of the keystone species Euphausia superba (Antarctic krill) by conducting a CO(2) perturbation experiment at ambient and elevated atmospheric CO(2) levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO(2) conditions (∼672 ppm), ingestion rates of krill averaged 78 µg C individual(-1) d(-1) and were 3.5 times higher than krill ingestion rates at ambient, present day CO(2) concentrations. Additionally, rates of ammonium, phosphate, and dissolved organic carbon (DOC) excretion by krill were 1.5, 1.5, and 3.0 times higher, respectively, in the high CO(2) treatment than at ambient CO(2) concentrations. Excretion of urea, however, was ∼17% lower in the high CO(2) treatment, suggesting differences in catabolic processes of krill between treatments. Activities of key metabolic enzymes, malate dehydrogenase (MDH) and lactate dehydrogenase (LDH), were consistently higher in the high CO(2) treatment. The observed shifts in metabolism are consistent with increased physiological costs associated with regulating internal acid-base equilibria. This represents an additional stress that may hamper growth and reproduction, which would negatively impact an already declining krill population along the WAP. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Ocean acidification Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula PLoS ONE 7 12 e52224 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Grace K Saba Oscar Schofield Joseph J Torres Erica H Ombres Deborah K Steinberg Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
topic_facet |
Medicine R Science Q |
description |
Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO(2) concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance. We assessed feeding and nutrient excretion rates in natural populations of the keystone species Euphausia superba (Antarctic krill) by conducting a CO(2) perturbation experiment at ambient and elevated atmospheric CO(2) levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO(2) conditions (∼672 ppm), ingestion rates of krill averaged 78 µg C individual(-1) d(-1) and were 3.5 times higher than krill ingestion rates at ambient, present day CO(2) concentrations. Additionally, rates of ammonium, phosphate, and dissolved organic carbon (DOC) excretion by krill were 1.5, 1.5, and 3.0 times higher, respectively, in the high CO(2) treatment than at ambient CO(2) concentrations. Excretion of urea, however, was ∼17% lower in the high CO(2) treatment, suggesting differences in catabolic processes of krill between treatments. Activities of key metabolic enzymes, malate dehydrogenase (MDH) and lactate dehydrogenase (LDH), were consistently higher in the high CO(2) treatment. The observed shifts in metabolism are consistent with increased physiological costs associated with regulating internal acid-base equilibria. This represents an additional stress that may hamper growth and reproduction, which would negatively impact an already declining krill population along the WAP. |
format |
Article in Journal/Newspaper |
author |
Grace K Saba Oscar Schofield Joseph J Torres Erica H Ombres Deborah K Steinberg |
author_facet |
Grace K Saba Oscar Schofield Joseph J Torres Erica H Ombres Deborah K Steinberg |
author_sort |
Grace K Saba |
title |
Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
title_short |
Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
title_full |
Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
title_fullStr |
Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
title_full_unstemmed |
Increased feeding and nutrient excretion of adult Antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO₂). |
title_sort |
increased feeding and nutrient excretion of adult antarctic krill, euphausia superba, exposed to enhanced carbon dioxide (co₂). |
publisher |
Public Library of Science (PLoS) |
publishDate |
2012 |
url |
https://doi.org/10.1371/journal.pone.0052224 https://doaj.org/article/19c4d2395ecc4019aef640a4303993ce |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Ocean acidification |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Ocean acidification |
op_source |
PLoS ONE, Vol 7, Iss 12, p e52224 (2012) |
op_relation |
http://europepmc.org/articles/PMC3530562?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0052224 https://doaj.org/article/19c4d2395ecc4019aef640a4303993ce |
op_doi |
https://doi.org/10.1371/journal.pone.0052224 |
container_title |
PLoS ONE |
container_volume |
7 |
container_issue |
12 |
container_start_page |
e52224 |
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1766042339967500288 |