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Marine Biology

, Volume 153, Issue 3, pp 483–491 | Cite as

Relationships between RNA content and egg production rate in Acartia bifilosa (Copepoda, Calanoida) of different spatial and temporal origin

  • Towe Holmborn
  • Elena Gorokhova
Research Article

Abstract

To evaluate factors regulating RNA content (RNA, μg RNA female−1) – egg production rate (EPR, eggs female−1 day−1) relationship and to develop a model for in situ egg production rate estimates for Acartia bifilosa, we (1) measured EPR and RNA in females sampled at geographically distant areas at varying temperature (T, °C), (2) determined environmental (station, season, and T), endogenous (prosome length (PL), mm and EPR) variables that influence RNA levels, and (3) explored a set of multiple regression models to predict EPR from RNA, PL, station, season, and T. Egg production experiments were carried out in spring and summer 2005 in the Gulf of Finland and in the western part of the northern Baltic proper. We found that up to 88% of the RNA variation could be explained by variations in PL, EPR, and season/T. In explaining the RNA variability, PL played a major role followed in order of importance by EPR and season/T. Further, PL, RNA, and season/T explained up to 53% of the variation in EPR, nearly half of which is explained by RNA alone. The effect of spatial origin was never significant, suggesting that the derived relationships are general for A. bifilosa inhabiting northern Baltic proper.

Keywords

Beta Weight Prosome Length Calanus Finmarchicus Individual Copepod High Partial Correlation 
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

Acknowledgments

We thank J.-O. Persson (Mathematical Statistics, Stockholm University) for assistance with regression analysis and staff and colleagues at Tvärminne Zoological Station (Finland) and Askö Field Station (Sweden) for various help and support. We acknowledge also valuable comments from two anonymous reviewers on an earlier version of the manuscript. This study was financially supported by Walter and Andrée de Nottbeck Foundation (Finland) and Stockholm Marine Research Centre (Sweden).

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Systems EcologyStockholm UniversityStockholmSweden

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