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Marine Biology

, Volume 114, Issue 2, pp 219–228 | Cite as

Recruitment, growth, and diel vertical migration of Euphausia pacifica in a temperate fjord

  • Stephen M. Bollens
  • Bruce W. Frost
  • Tom S. Lin
Article

Abstract

The pelagic crustacean Euphausia pacifica Hansen was sampled with a multiple-sample 1.0 m2 Tucker trawl and a multiple-sample 1.0 m2 vertical net in Dabob Bay, Washington on 17 dates between May 1985 and October 1987. Size (stage) structure and abundance of the population were determined for each date, while vertical distribution and diel migration were determined for 13 dates. Although internannual variability in both timing and magnitude of events occurred, consistent patterns were discernable. The population produced a large pulse of larvae (2 to 5 mm) in late spring of each year, apparently in response to the vernal phytoplankton bloom. Much lower abundances of larvae occurred during summer and autumn of each year, and larvae were completely absent during winter. Recruitment to the juvenile (6 to 9 mm) and adult (≥10 mm) stages was strongest during the summer, with abundances of these individuals peaking in summer and autumn. Individual growth rates, determined by modal progression analysis, were calculated for E. pacifica. Rates ranged from zero for some adult cohorts during the winter to 0.12 mm d-1 for larvae during spring. The latter are among the highest ever reported for this species in the field. The vertical distributions and diel vertical migrations (DVM) of E. pacifica varied seasonally and between size (stage) classes. At night, all size classes were distributed in the surface layer (upper 25 m) irrespective of season or year. During the day, the larger/older stages were always distributed at middepths (50 to 125 m). In contrast, the daytime distribution of the larvae was more variable, being concentrated at the surface during spring and early summer of 1985, and at increasing depths later in the summer and autumn of 1985 and again in spring of 1986. This resulted in invariant DVM in the juveniles and adults, but variable DVM in the larvae, the latter of which is hypothesized to be a response to variable abundances of zooplanktivorous fish.

Keywords

Phytoplankton Vertical Distribution Phytoplankton Bloom Individual Growth Diel Vertical Migration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Stephen M. Bollens
    • 1
  • Bruce W. Frost
    • 1
  • Tom S. Lin
    • 1
  1. 1.School of Oceanography, WB-10University of WashingtonSeattleUSA

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