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

http://ir.library.oregonstate.edu/concern/articles/5x21th08t

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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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