Abstract
Genetics Marine species exhibit strong genetic variation in relation to oceanographic conditions, but the extent to which entire assemblages of species respond in concert is unknown. Stanley et al. document genetic clines of native cod, lobster, scallop, and shrimp and an introduced crab—species that differ widely in ecology—from North Carolina, USA, to Labrador, Canada. All five species exhibit strikingly similar genetic clines, with a sharp biogeographic break between northern and southern populations centered east of Nova Scotia. The genetic break closely coincides with steep gradients in oceanographic conditions, most importantly seasonal minimum temperature. Sci. Adv. 10.1126/sciadv.aaq0929 (2018).
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