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Physiological effects of hypercapnia in the deep-sea bivalve Acesta excavata (Fabricius, 1779) (Bivalvia; Limidae).

Abstract
The option of storing CO(2) in subsea rock formations to mitigate future increases in atmospheric CO(2) may induce problems for animals in the deep sea. In the present study the deep-sea bivalve Acesta excavata was subjected to environmental hypercapnia (pHSW 6.35, P(CO₂) =33,000 μatm) corresponding to conditions reported from natural CO(2) seeps. Effects on acid-base status and metabolic rate were related to time of exposure and subsequent recovery. During exposure there was an uncompensated drop in both hemolymph and intracellular pH. Intracellular pH returned to control values, while extracellular pH remained significantly lower during recovery. Intracellular non-bicarbonate buffering capacity of the posterior adductor muscle of hypercapnic animals was significantly lower than control values, but this was not the case for the remaining tissues analyzed. Oxygen consumption initially dropped by 60%, but then increased during the final stages of exposure, which may suggest a higher tolerance to hypercapnia than expected for a deep-living species.
AuthorsKaren M Hammer, Erlend Kristiansen, Karl Erik Zachariassen
JournalMarine environmental research (Mar Environ Res) Vol. 72 Issue 3 Pg. 135-42 (Sep 2011) ISSN: 1879-0291 [Electronic] England
PMID21831420 (Publication Type: Evaluation Study, Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2011 Elsevier Ltd. All rights reserved.
Chemical References
  • Bicarbonates
  • Carbon Dioxide
  • Oxygen
Topics
  • Acclimatization
  • Acid-Base Equilibrium
  • Animals
  • Atlantic Ocean
  • Bicarbonates (blood, metabolism)
  • Bivalvia (physiology)
  • Carbon Dioxide (blood, pharmacology)
  • Energy Metabolism
  • Environment
  • Environmental Monitoring (methods)
  • Hemolymph
  • Muscle, Skeletal (drug effects)
  • Norway
  • Oxygen (blood, metabolism)
  • Oxygen Consumption
  • Seawater (chemistry)

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