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Marine Ecology Progress Series

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MEPS 626:97-108 (2019)  -  DOI: https://doi.org/10.3354/meps13075

Behavioural and eco-physiological responses of the mussel Mytilus galloprovincialis to acidification and distinct feeding regimes

Jihene Lassoued1,2, Jose M. F. Babarro1,*, X. A. Padín1, Luc A. Comeau3, Nejla Bejaoui2, Fiz F. Pérez1

1Instituto de Investigaciones Marinas, IIM-CSIC, Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
2Institut National Agronomique de Tunisie INAT, Université de Carthage, 43 Avenue Charles Nicolle, 1082 Tunis, Tunisia
3Fisheries and Oceans Canada, Gulf Fisheries Centre, 343 Avenue Université, Moncton, New Brunswick E1C 9B6, Canada
*Corresponding author:

ABSTRACT: The carbon dioxide taken up by the ocean is increasing as levels of atmospheric carbon dioxide increase, thus lowering the ocean pH and altering the carbonate system. In this laboratory study, we evaluated the physiological responses of juvenile mussels Mytilus galloprovincialis from Galician waters (NW Iberian Peninsula) exposed to control (500 µatm) and elevated (800 or 1200 µatm) seawater pCO2 conditions under 2 different feeding regimes (optimal and suboptimal). Shell properties such as compressive strength and composition (organic matter and aragonite:calcite ratio) were negatively affected by high seawater pCO2, regardless of food availability. This result suggests that water chemistry is a main driver for shell development. Under the optimal feeding regime, mussel feeding rates increased in response to elevated pCO2, presumably as a strategy to maintain a high strength of attachment. In contrast, mussels on the suboptimal diet showed weak attachment and narrow valve opening at the highest pCO2 condition. Thus, our results suggest that with optimal food availability, mussels were resilient to water acidification with respect to feeding activity, valve opening and attachment strength. Under a suboptimal diet, however, the ability of mussels to respond to acidification was compromised. These results highlight complex ecophysiological interactions for calcifying organisms subjected to climate change.


KEY WORDS: Marine mussels · Acidic conditions · Diet · Interaction · Behaviour


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Cite this article as: Lassoued J, Babarro JMF, Padín XA, Comeau LA, Bejaoui N, Pérez FF (2019) Behavioural and eco-physiological responses of the mussel Mytilus galloprovincialis to acidification and distinct feeding regimes. Mar Ecol Prog Ser 626:97-108. https://doi.org/10.3354/meps13075

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