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Relationships between RNA content and egg production rate in Acartia bifilosa (Copepoda, Calanoida) of different spatial and temporal origin
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2008 (English)In: MARINE BIOLOGY, ISSN 0025-3162, Vol. 153, no 3, 483-491 p.Article in journal (Refereed) Published
Abstract [en]

To evaluate factors regulating RNA content (RNA, mu g 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, degrees 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.

Place, publisher, year, edition, pages
2008. Vol. 153, no 3, 483-491 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-15629DOI: doi:10.1007/s00227-007-0838-2ISI: 000251488200023OAI: oai:DiVA.org:su-15629DiVA: diva2:182149
Note
There is an Erratum available for this publicationAvailable from: 2008-12-07 Created: 2008-12-07 Last updated: 2009-09-01Bibliographically approved
In thesis
1. Zooplankton growth and trophic linkages: Implications for fish feeding conditions in the Baltic Sea
Open this publication in new window or tab >>Zooplankton growth and trophic linkages: Implications for fish feeding conditions in the Baltic Sea
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this Thesis was to improve our understanding and assessment of feeding conditions for zooplanktivorous fish in the Baltic Sea.

We investigated (papers I, II) the usefulness of biochemical proxies for assessments of growth and metabolic rates in the dominant Baltic copepod Acartia bifilosa. A predictive model (paper I) for egg production rate (EPR), based on body size, RNA content, and water temperature, was established using females of different geographical origin. This model demonstrates the usefulness of RNA content as a proxy for growth in zooplankton and, together with abundance data, it could be used to evaluate fish feeding conditions. Further (paper II), using A. bifilosa exposed to a food gradient, we evaluated responses of physiological rates and other biochemical proxies for growth and established correlations between physiological and biochemical variables. EPR and ingestion rate were most significantly correlated with RNA content. As assayed variables saturated at different food concentrations, food availability may affect assessments of physiological rates using proxies. In paper III, we explored the effect of high EPR and ingestion rate on astaxanthin content in A. bifilosa. We found that the astaxanthin content decreased at high feeding rates, most likely due to decreased assimilation efficiency. This may impact the quality of zooplankton as prey.

The invasion of Cercopagis pengoi, a zooplanktivorous cladoceran, has altered the trophic linkages in the Baltic Sea food web. In paper IV, we evaluated the feeding of zooplanktivorous fish on C. pengoi and found that irrespective of size both herring and sprat feed on it, with large herring being more selective. In turn, C. pengoi feeds mainly on older copepods (paper V), which are acknowledged important in fish nutrition. These results indicate that C. pengoi may compete with fish due to the diet overlap.

Place, publisher, year, edition, pages
Stockholm: Department of System Ecology, Stockholm University, 2009. 38 p.
Keyword
AARS activity, biochemical markers, Clupea harengus, copepod physiology, food web interactions, non-indigenous species, RNA-based indices, Sprattus sprattus, stable isotopes
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-29485 (URN)978-91-7155-908-1 (ISBN)
Public defence
2009-10-14, G-salen, Arrheniuslaboratorierna, Svante Arrhenius väg 16, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: In progress. Paper 3: Submitted

Available from: 2009-09-22 Created: 2009-09-01 Last updated: 2012-10-31Bibliographically approved

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