4.7 Article

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

期刊

LIMNOLOGY AND OCEANOGRAPHY
卷 61, 期 3, 页码 969-983

出版社

WILEY
DOI: 10.1002/lno.10265

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资金

  1. Proyecto ANILLOS by CONICYT [ACT-132]
  2. Fondecyt [1130254]
  3. Millennium Nucleus Center for the Study of Multiple-drivers on Marine Socio-Ecological Systems (MUSELS) - MINECON [NC120086]
  4. Millennium Scientific Initiative [IC120019]
  5. Red Doctoral REDOC.CTA MINEDUC at U. de Concepcion [UCO1202]
  6. US National Science Foundation CIO-OA [1041267]
  7. Division Of Ocean Sciences
  8. Directorate For Geosciences [1041267] Funding Source: National Science Foundation

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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., pCO(2), pH, Omega(ar)) across four regions covering a wide latitudinal range (328550S-408100S). The river-influenced habitats selected for transplant experiments were different than open coastal habitats; with higher pCO(2) (354-1313 mu atm), lower pH (7.6-7.9) and Omega(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 (delta C-13) 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 delta C-13(POC) and delta C-13(Tissue), which likely influenced the isotopic composition of the shell carbon.

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