Clock-linked genes underlie seasonal migratory timing in a diurnal raptor.

The absence of consistent linkages between genetic variation in clock genes and phenological variability in birds may be due in part to the focus on core clock genes rather than genes that entrain and modulate the clock pathway, and/or to limitations in detection methods that focus only on highly significant outlier loci, thus ignoring genes of small effect [ 28 – 32 ].

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