Moderate seawater acidification does not elicit long-term metabolic depression in the blue mussel Mytilus edulis

Thomsen, Jörn and Melzner, Frank (2010) Moderate seawater acidification does not elicit long-term metabolic depression in the blue mussel Mytilus edulis Marine Biology, 157 . pp. 2667-2676. DOI 10.1007/s00227-010-1527-0.

[img]
Preview
Text
MarBiol.pdf - Published Version

Download (302Kb)

Supplementary data:

Abstract

Marine organisms are exposed to increasingly acidic oceans, as a result of equilibration of surface ocean water with rising atmospheric CO2 concentrations. In this study, we examined the physiological response of Mytilus edulis from the Baltic Sea, grown for 2 months at 4 seawater pCO2 levels (39, 113, 243 and 405 Pa/385, 1,120, 2,400 and 4,000 latm). Shell and somatic growth, calcification, oxygen consumption and NHþ4 excretion rates were measured in order to test the hypothesis whether exposure to elevated seawater pCO2 is causally related to metabolic depression. During the experimental period, mussel shell mass and shell-free dry mass (SFDM) increased at least by a factor of two and three, respectively. However, shell length and shell mass growth decreased linearly with increasing pCO2 by 6–20 and 10–34%, while SFDM growth was not significantly affected by hypercapnia. We observed a parabolic change in routine metabolic rates with increasing pCO2 and the highest rates (?60%) at 243 Pa. NHþ4 excretion rose linearly with increasing pCO2. Decreased O:N ratios at the highest seawater pCO2 indicate enhanced protein metabolism which may contribute to intracellular pH regulation. We suggest that reduced shell growth under severe acidification is not caused by (global) metabolic depression but is potentially due to synergistic
effects of increased cellular energy demand and nitrogen
loss.

Document Type: Article
Additional Information: WOS:000284161900008
Keywords: Zoology; Ecology; ocean acidification; Mytilus edulis; ACID-BASE-BALANCE; INVERTEBRATE SIPUNCULUS-NUDUS; OCEAN ACIDIFICATION; AMMONIA EXCRETION; ENVIRONMENTAL HYPERCAPNIA; OXYGEN-CONSUMPTION; ATPASE INVOLVEMENT; PROTEIN-METABOLISM; ANIMAL PHYSIOLOGY; CARBON-DIOXIDE
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1007/s00227-010-1527-0
ISSN: 0025-3162
Projects: BIOACID, Future Ocean
Date Deposited: 29 Nov 2010 13:20
Last Modified: 19 Sep 2013 05:41
URI: http://oceanrep.geomar.de/id/eprint/10215

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...