NO CORRELATION. “Subsequent studies on different populations or taxa have failed to find similar associations (e.g., no correlation with latitudinal clines in bluethroats, barn swallows, Tachycineta swallows or three-spined stickleback, breeding phenology in great tits or barn swallows, or migratory propensity in blackcaps.”
https://lnkd.in/dWFycUQ