Marine Biology

, Volume 151, Issue 2, pp 515–527 | Cite as

Life cycle of Pseudocalanus acuspes Giesbrecht (Copepoda, Calanoida) in the Central Baltic Sea: II. Reproduction, growth and secondary production

  • Jasmin RenzEmail author
  • Janna Peters
  • Hans-Jürgen Hirche
Research Article


The population dynamics of Pseudocalanus acuspes in the Central Baltic Sea were studied from March 2002 to May 2003 on a monthly basis. All stages were present year round with a stage shift from nauplii to older copepodite stages over the course of the year. Biomass, estimated from prosome length, peaked between May and September with maximum recorded values of 594 and 855 mg C m−2 in May 2002 and 2003, respectively. Differences in biomass between stations up to a factor of 20 were observed especially in April/May and October. Mean egg production rate (EPR) showed a seasonal course and was highest in April 2002 and 2003 with 3.6 and 2.1 eggs f−1 day−1, respectively, corresponding to a mean weight-specific egg production rate (SEPR) of 0.13 and 0.04. Egg production seems to be limited by food from May on. Stage durations determined from moulting experiments turned out to be extremely long. Maximum growth rates based on stage durations of 15–25 days at 4°C in May and July 2003 amounted for 0.03–0.05 day−1 in CI-CIV. Comparing these rates with rates derived from temperature–development relationships for P. acuspes from the literature resulted in five times higher growth rates for the latter case. Secondary production reached values up to 9.1 mg C m−2 day−1 (method for continuously reproducing populations) and 10.5 mg C m−2 day−1 (increment summation).


Secondary Production Stage Duration Copepodite Stage Prosome Length Bornholm Basin 
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.



We like to thank the crews and scientific parties of the RV Alkor, Heincke and A.v.Humboldt for the provided support during the field phase, K. Barz for help with the egg production experiments and U. Holtz for help with length measurements. The critical revision and improvement of the manuscript by three anonymous reviewers is gratefully acknowledged. The study was funded by the German Federal Ministry for Education and Research within the GLOBEC GERMANY project (03F0320C).


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Jasmin Renz
    • 1
    Email author
  • Janna Peters
    • 2
  • Hans-Jürgen Hirche
    • 1
  1. 1.Alfred Wegener Institute for Polar and Marine ResearchBremerhavenGermany
  2. 2.Marine ZoologyUniversity of BremenBremenGermany

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