The emergence period of sea trout fry in a Lake District stream correlates with the North Atlantic Oscillation

Authors

  • J.M. Elliott,

    Corresponding author
    1. Institute of Freshwater Ecology, NERC Centre for Ecology and Hydrology, The Windermere Laboratory, Ambleside, Cumbria LA22 0LP, U.K.
      *Author to whom correspondence should be addressed. Tel.: +44 (0)15394 42468; fax: +44 (0)15394 46914; email: jmel@wpo.nerc.ac.uk
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  • M. A. Hurley,

    1. Institute of Freshwater Ecology, NERC Centre for Ecology and Hydrology, The Windermere Laboratory, Ambleside, Cumbria LA22 0LP, U.K.
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  • S. C. Maberly

    1. Institute of Freshwater Ecology, NERC Centre for Ecology and Hydrology, The Windermere Laboratory, Ambleside, Cumbria LA22 0LP, U.K.
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*Author to whom correspondence should be addressed. Tel.: +44 (0)15394 42468; fax: +44 (0)15394 46914; email: jmel@wpo.nerc.ac.uk

Abstract

The date of fry emergence over 30 years in a sea trout nursery stream, predicted by an individual-based model, correlated significantly (r=0·660, P<0·001) with an index of the North Atlantic Oscillation. Water temperature is the main driving variable in the model and stream temperature also correlated significantly (r=0·662, P<0·001) with the index, providing a probable causal link. Therefore, the inter-annual variations in emergence may not be unique to this one stream, but may be typical of other trout streams with similar climatic conditions.

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