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Article Dans Une Revue Marine and Freshwater Behaviour and Physiology Année : 2022

Copepod oxygen consumption along a salinity gradient

Résumé

Climate change-induced salinity decrease is currently occurring in many estuarine coastal zones, due to increased outflow of freshwater. This freshening can be a problem for brackish-water animals, already living on the edge of their salinity tolerance. We measured oxygen consumption of common copepod Eurytemora affinis along a natural salinity gradient in the western Gulf of Finland. The salinity varied between 3 in the inner bay and 7 in the offshore area along the gradient, pH varied between 7.05 and 7.86. Our results show that respiration increased with decreasing salinity, as expected for a genus more commonly found in estuarine/saline waters, even if it has colonised brackish waters. Our results suggest that future decreasing salinity could enhance respiration rate, and so energy requirements, of large-bodied zooplankton in estuarine areas such as the Baltic Sea and could lead to lower food quality availability for coastal planktivorous fish, such as herring and sprat.
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Dates et versions

hal-03755529 , version 1 (22-08-2022)

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Tanguy Soulié, Jonna Engström-Öst, Olivier Glippa. Copepod oxygen consumption along a salinity gradient. Marine and Freshwater Behaviour and Physiology, 2022, pp.1-13. ⟨10.1080/10236244.2022.2104720⟩. ⟨hal-03755529⟩
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