a significant trendP = 0.044
However, there was a significant trend that early migrating species tended to advance, and late migrating species tended to delay, their departure dates (r s = 0.32, df = 39, P = 0.044, Fig. 1 , Table S1 ).
However, there was a significant trend that early migrating species tended to advance, and late migrating species tended to delay, their departure dates (r s = 0.32, df = 39, P = 0.044, Fig. 1 , Table S1 ).