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 CO2 concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.634.4650 2023-05-15T13:37:45+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 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.4650 http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.4650 http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf text ftciteseerx 2016-01-08T15:38:01Z Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO2 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 CO2 perturbation experiment at ambient and elevated atmospheric CO2 levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO2 conditions (,672 ppm), ingestion rates of krill averaged 78 mg C individual21 d21 and were 3.5 times higher than krill ingestion rates at ambient, present day CO2 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 CO2 treatment than at ambient CO2 concentrations. Excretion of urea, however, was,17 % lower in the high CO2 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 CO2 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 Text Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Ocean acidification Unknown Antarctic Antarctic Peninsula |
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English |
description |
Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO2 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 CO2 perturbation experiment at ambient and elevated atmospheric CO2 levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO2 conditions (,672 ppm), ingestion rates of krill averaged 78 mg C individual21 d21 and were 3.5 times higher than krill ingestion rates at ambient, present day CO2 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 CO2 treatment than at ambient CO2 concentrations. Excretion of urea, however, was,17 % lower in the high CO2 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 CO2 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 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Grace K. Saba Oscar Schofield Joseph J. Torres Erica H. Ombres Deborah K. Steinberg |
spellingShingle |
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) |
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) |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.4650 http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf |
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 |
http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.634.4650 http://pal.lternet.edu/docs/bibliography/Public/429lterc.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766097219130228736 |