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Marine Biology

, Volume 148, Issue 5, pp 1061–1070 | Cite as

The effects of temperature and salinity on egg production and hatching success of Baltic Acartia tonsa (Copepoda: Calanoida): a laboratory investigation

  • Linda Holste
  • Myron A. Peck
Research Article

Abstract

The functional response of the aspects of reproductive success of a southwestern Baltic population of Acartia tonsa (Copepoda: Calanoida) was quantified in the laboratory using wide ranges in temperatures and salinities. Specifically, daily egg production (EP, # female−1 day−1) was determined for 4 or 5 days at 18 different temperatures between 5 and 34°C and the time course and success of hatching were evaluated at 10 different temperatures between 5 and 23°C. The effect of salinity (0 to 34 psu) on egg hatching success was also examined. The highest mean rates of EP were observed between 22 and 23°C (46.8–50.9 eggs female−1 day−1). When studied at 18 psu, hatching success of eggs increased with increasing temperature and was highest (92.2%) at 23°C. No hatching was observed for eggs incubated at low temperatures (≤12°C) that were produced by females acclimated to temperatures ≤10°C indicating a possible thermal threshold between 10.0 and 13.0°C below which only the production of diapause (or low quality) eggs exists in this population. When tested at 18°C, the hatching success of eggs incubated at 15 different salinities increased asymptotically with increasing salinity and was maximal (81.4–84.5%) between 17 and 25 psu. The high reproductive success observed over wide ranges in temperatures and salinities in this Baltic population demonstrates one of the mechanisms responsible for the cosmopolitan distribution of this species within productive, estuarine and marine habitats.

Keywords

Vital Rate Hatching Success Copepod Species Prosome Length Percent Hatch 
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.

Notes

Acknowledgements

We are grateful for the help of Philipp Kanstinger, Bianca Ewest, Meike Martin and Gudrun Bening with laboratory rearing and data collection. We would also like to thank Dr. Mike A. St.John and Dr. Axel Temming and two anonymous reviewers for helpful comments and suggestions on earlier drafts of this manuscript. This research was funded by the Global Ocean Ecosystem Dynamics (GLOBEC, Germany) program by the German Federal Ministry for Education and Research (BMBF 03F0320E) and the German Science Foundation (DFG) AQUASHIFT program cluster Resolving Trophodynamic Consequences of Climate Change (“RECONN”, DFG # JO556/1-1).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Institute for Hydrobiology and Fisheries ResearchUniversity of HamburgHamburgGermany

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