Earlier Spring Warming of Coastal Streams and Implications for Alewife Migration Timing

摘要: Abstract Seasonal temperature increases have been shown to correlate with changes in the migration timing of fish. We looked at existing and fish count data for anadromous alewives Alosa pseudoharengus several southern New England streams. Run initiation, defined as occurring when first 5% total annual run migrated, was associated 9°C. A weighted-mean temperature, considered an overall indicator timing, revealed that 13°C a consistent predictor one historic three recent alewife streams over years. Because historical daily water temperatures concurrent counts were unavailable any site, we used occurrence 9°C stream determine magnitude detectable shift between 1970s Stream spring warmed about 12 d earlier years than they did 1970s. This implied that...