International Journal of Earth Sciences

, Volume 96, Issue 3, pp 525–540

ENSO-coupled precipitation records (1959–2004) based on shells of freshwater bivalve mollusks (Margaritifera falcata) from British Columbia

  • Bernd R. Schöne
  • Nicholas A. Page
  • David L. Rodland
  • Jens Fiebig
  • Sven Baier
  • Samuli O. Helama
  • Wolfgang Oschmann
Original Paper

DOI: 10.1007/s00531-006-0109-3

Cite this article as:
Schöne, B.R., Page, N.A., Rodland, D.L. et al. Int J Earth Sci (Geol Rundsch) (2007) 96: 525. doi:10.1007/s00531-006-0109-3

Abstract

We present the results of sclerochronologically calibrated growth and stable isotope analyses of the freshwater bivalve Margaritifera falcata collected from an agricultural, suburban setting near Vancouver, BC. The oxygen isotope range of shell aragonite can be explained by the temperature range during the growing season, assuming the water δ18O composition remained constant. However, shell growth is strongly influenced by local summer precipitation and potentially runoff of nutrient-rich stormwater. About 44% of the variability of annual shell growth can be explained by amounts of local summer (June–September) rainfall. Local winter precipitation and El Niño–Southern Oscillation (ENSO) strength during the preceding year exert a weak, but significant control on shell growth. In combination, summer and winter precipitation can explain up to 50% of the variability in annual shell growth. Spectral analyses substantiate the effect of precipitation on shell growth and demonstrate that shell growth and ENSO are coupled by precipitation. Common spectral density was found at periods of 6.5–9 years, particularly between 1985 and 2004. Higher frequency oscillation corresponding to periods of 3–5 years occurred during the early 1970s, early to mid 1980s, and later 1990s. These results suggest that skeletal records of bivalve mollusks provide suitable archives of ENSO-coupled precipitation in areas where other climate proxies such as tree-rings and speleothems may not be available.

Keywords

Sclerochronology Stable isotope geochemistry Runoff Climate records El Niño–Southern Oscillation 

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Bernd R. Schöne
    • 1
  • Nicholas A. Page
    • 2
  • David L. Rodland
    • 1
  • Jens Fiebig
    • 1
  • Sven Baier
    • 1
  • Samuli O. Helama
    • 1
  • Wolfgang Oschmann
    • 1
  1. 1.INCREMENTS Research Group, Institute for Geology and PaleontologyUniversity of FrankfurtFrankfurt/MainGermany
  2. 2.Raincoast Applied EcologyVancouverCanada

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