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Riverine discharges impact physiological traits and carbon sources for shell carbonate in the marine intertidal mussel Perumytilus purpuratus Public Deposited

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  • Anthropogenic modification watersheds and climate change have altered export from fluvial systems causing changes to the carbonate chemistry of river-influenced near shore environments. To determine the possible effects of riverine discharges on the mussel Perumytilus purpuratus, we performed in situ transplant experiments between river-influenced and open coastal habitats with contrasting seawater carbonate chemistries (i.e., pCO₂, pH, Ω[subscript]ar) across four regions covering a wide latitudinal range (32°55′S–40°10′S). The river-influenced habitats selected for transplant experiments were different than open coastal habitats; with higher pCO₂ (354–1313 μatm), lower pH (7.6–7.9) and Ω[subscript]ar values (0.4–1.4) than in open coastal area. Growth, calcification, metabolism were measured in a reciprocal transplant experiment to determine physiological responses associated with river-influenced sites and non-influenced control sites. Growth and calcification rates were higher in river-influenced habitats; however the organisms in this area also had lower metabolic rates, possibly due to enhanced food supply from river systems. Further analysis of carbon isotopic composition (δ¹³C) indicated that the relative contribution of seawater dissolved inorganic carbon (DIC) to the carbonate shells of P. purpuratus was much higher than respiratory carbon. Nevertheless, P. purpuratus incorporated between 7% and 26% of metabolic carbon in the shell depending on season. There was a strong, significant relationship between δ¹³C[subscript]POC and δ¹³C[subscript]Tissue, which likely influenced the isotopic composition of the shell carbon.
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  • Pérez, C. A., Lagos, N. A., Saldías, G. S., Waldbusser, G., & Vargas, C. A. (2016). Riverine discharges impact physiological traits and carbon sources for shell carbonate in the marine intertidal mussel Perumytilus purpuratus. Limnology and Oceanography, 61(3), 969-983. doi:10.1002/lno.10265
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  • 61
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  • 3
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  • This work was supported by the Proyecto ANILLOS ACT-132 by CONICYT, Fondecyt Grant 1130254, Millennium Nucleus "Center for the Study of Multiple-drivers on Marine Socio-Ecological Systems (MUSELS)" funded by MINECON NC120086, the Millennium Scientific Initiative Grant IC120019 also supported this work during the final stage and Red Doctoral REDOC.CTA MINEDUC project UCO1202 at U. de Concepcion. The US National Science Foundation CIO-OA #1041267 supported GGW during the preparation of this manuscript.
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