Figure: Seasonal distribution of Calanus finmarchicus (Planque et al.,
1997)
A: NE Atlantic
B: Southern parts of NW Atlantic
C: Labrador Sea
Regional variation of abundance
q Low abundance during winter. cV copepodites migrate to
deeper water to constitute the
overwintering stock.
q Low
levels of molecular genetic diversity; genetic
bottleneck with 75% range reduction and
latitudinal displacement in last
glacial maximum (Bucklin and Wiebe, 1998).