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JPR Advance Access published online on April 18, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi015
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© Oxford University Press.2005. All rights reserved. for Permissions, please email: journals.permissions@oupjournals.org
Received September 29, 2004
Accepted March 24, 2005

Article

Distribution and Species-Specific Egg Production of Pseudocalanus in the Gulf of Alaska

Jeffrey M. Napp 1*, Russell R. Hopcroft 2, Christine T. Baier 1, and Cheryl Clarke 2

1 NOAA/Alaska Fisheries Science Center 7600 Sand Point Way NE Seattle, WA 98115-0070
2 Institute of Marine Science University of Alaska, Fairbanks Fairbanks, AK 99775-7220

* To whom correspondence should be addressed.
Jeffrey M. Napp, E-mail: Jeff.Napp{at}NOAA.gov


  Abstract

Pseudocalanus species are important contributors to the secondary production of the northern hemisphere mid- to high-latitude oceans. In the coastal Gulf of Alaska, Pseudocalanus are present year-round, and are represented by three species. In 2001, P. mimus was the dominant Pseudocalanus species on the shelf during spring and summer, comprising 30 - 100% of the total, while P. newmani dominated in Prince William Sound (10 - 90%). P. minutus were only abundant in Prince William Sound during early spring. Egg production (by number and volume) was a function of female prosome length and decreased from spring to summer, however significant variability was attributable to regional influences that were independent of size. For the same sized female, P. newmani produced more eggs per clutch than P. mimus. P mimus, however, tended to have a larger mean egg size than P. newmani. Consequently, clutch volumes of the two species were indistinguishable. Pseudocalanus egg production rates (eggs female-1 day-1) were lower in July and August (ca. 2 - 4) than April and May (ca. 1 - 9), but total egg production by the population (eggs day-1) was nearly equivalent for the three time periods due to higher female concentrations in summer.

Keywords: Pseudocalanus mimus, Pseudocalanus newmani, Gulf of Alaska, egg production, distribution.
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