Changes in breeding phenology of eastern Ontario frogs over four decades.

Rana sylvatica appeared to be calling earlier by an average of 0.48 days per year, or 19.2 days over four decades; however, the trend was borderline non-significant ( F 1 , 20 = 3.157, R 2 = 0.136, P = 0.091).

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Rana sylvatica showed a trend toward earlier emergence by 19 days, whereas we did not detect changes in emergence phenology for the remaining five species.

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