Effects of different oxygen regimes on ecological performance and bioenergetics of a coastal marine bioturbator, the soft shell clam Mya arenaria.

Autor: Ouillon N; Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany., Forster S; Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany., Timm S; Department of Plant Physiology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany., Jarrett A; Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany., Otto S; Department of Marine Chemistry, Leibniz Institute for Baltic Research, Rostock 18119, Germany., Rehder G; Department of Marine Chemistry, Leibniz Institute for Baltic Research, Rostock 18119, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany., Sokolova IM; Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany. Electronic address: inna.sokolova@uni-rostock.de.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Feb 20; Vol. 860, pp. 160459. Date of Electronic Publication: 2022 Nov 24.
DOI: 10.1016/j.scitotenv.2022.160459
Abstrakt: Benthic species are exposed to oxygen fluctuations that can affect their performance and survival. Physiological effects and ecological consequences of fluctuating oxygen are not well understood in marine bioturbators such as the soft-shell clam Mya arenaria. We explored the effects of different oxygen regimes (21 days of exposure to constant hypoxia (~4.1 kPa P O2 ), cyclic hypoxia (~2.1-~10.4 kPa P O2 ) or normoxia (~21 kPa P O2 )) on energy metabolism, oxidative stress and ecological behaviors (bioirrigation and bioturbation) of M. arenaria. Constant hypoxia and post-hypoxic recovery in cyclic hypoxia led to oxidative injury of proteins and lipids, respectively. Clams acclimated to constant hypoxia maintained aerobic capacity similar to the normoxic clams. In contrast, clams acclimated to cyclic hypoxia suppressed aerobic metabolism and activated anaerobiosis during hypoxia, and strongly upregulated aerobic metabolism during recovery. Constant hypoxia led to decreased lipid content, whereas in cyclic hypoxia proteins and glycogen accumulated during recovery and were broken down during the hypoxic phase. Digging of clams was impaired by constant and cyclic hypoxia, and bioirrigation was also suppressed under constant hypoxia. Overall, cyclic hypoxia appears less stressful for M. arenaria due to the metabolic flexibility that ensures recovery during reoxygenation and mitigates the negative effects of hypoxia, whereas constant hypoxia leads to depletion of energy reserves and impairs ecological functions of M. arenaria potentially leading to negative ecological consequences in benthic ecosystems.
Competing Interests: Declaration of competing interest The authors declare no competing or financial interests.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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