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Stratified zooplankton sampling was conducted in the subarctic Pacific in June 2009 at four stations along 47°N from 0 to 3,000 m depth to evaluate longitudinal changes in population structure and vertical distribution of the dominant copepod species. At the westernmost station (160°E), the population structure of Eucalanus bungii and Me- tridia pacifica was dominated by early copepodid stages. In E. bungii, nauplii were abundant and adult females had developed ovaries at 160°E, while at the three stations to the east (167°E, 174°E and 179°W), no E. bungii nauplii were collected, and the resting stages were dominant. This suggests the species was reproducing near 160°E and in dia- pause in the east. In all three Neocalanus species analyzed (N. cristatus, N. flemingeri and N. plumchrus), late cope- podid stages were dominant at the eastern three stations. Lipid accumulation in the fifth copepodid stage of Neocala- nus spp. was greater in the west than in the east. This probably resulted from better food conditions and lower tem- peratures in the west, where copepods could consume more food during development than in the east.

East-west differences in population structure and vertical distribution of copepods along 47^|^deg;N in the subarctic Pacific in June 2009