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Intraspecific Variability in the Response of the Edible Mussel Mytilus chilensis (Hupe) to Ocean Acidification

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Abstract

Ocean acidification (OA) has been shown to affect significantly the net calcification process and growth rate of many marine calcifying organisms. Recent studies have shown that the responses of these organisms to OA can vary significantly among species. However, much less is known concerning the intraspecific variability in response to OA. In this study, we compared simultaneously the responses of two populations of the edible mussel Mytilus chilensis (Hupe) exposed to OA. Three nominal CO2 concentrations (380, 700, and 1,000 μatm of CO2) were used. Negative effects of CO2 increase on net calcification rate were only found in individuals from Huelmo Bay. However, no effects were found in individuals from Yaldad Bay. Moreover, OA had not significant effects on the shell dissolution rate in individuals from both localities. This suggests that the negative effect of the OA on the net calcification rate of this species is explained by shell deposition, but not by the shell dissolution processes. We do not know the specific underlying mechanisms responsible for these differences, but some possibilities are discussed. These results highlight that the responses of marine organism to OA can be highly variable even within the same species. Therefore, more studies across the distribution range of the species, considering environmental variability, are needed for a better understanding of the consequences of OA on marine organisms. Finally, because mussels exert influence on their physical and biological surroundings, the negative effects of a CO2 increase could have significant ecological consequences.

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Acknowledgments

The authors are grateful to Jorge López, Bárbara Cisternas, María Elisa Jara, and Loreto Mardones for their valuable assistance during the experiments and for the algae production. The manuscript was improved thanks to the comments from three anonymous reviewers. Financial support provided by the Programa de Investigación Asociativa, PIA-CONICYT-CHILE (Grant Anillos ACT-132) is gratefully acknowledged. This is Anillos ACT-132 publication no. 9. This study was also partially funded by Project Fondecyt no. 11110407 (to CD). The Millennium Scientific 13 Initiative Grant IC120019 also supported this work during the final stage. CAV is supported by Red 14 Doctoral REDOC.CTA, MINEDUC project UCO1202 at U. de Concepción.

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Duarte, C., Navarro, J.M., Acuña, K. et al. Intraspecific Variability in the Response of the Edible Mussel Mytilus chilensis (Hupe) to Ocean Acidification. Estuaries and Coasts 38, 590–598 (2015). https://doi.org/10.1007/s12237-014-9845-y

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