Change search
ReferencesLink to record
Permanent link

Direct link
Erratum to: 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 5, 1007-1008 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2008. Vol. 153, no 5, 1007-1008 p.
URN: urn:nbn:se:su:diva-29479DOI: 10.1007/s00227-007-0887-6OAI: diva2:233484
Available from: 2009-09-01 Created: 2009-09-01 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.
AARS activity, biochemical markers, Clupea harengus, copepod physiology, food web interactions, non-indigenous species, RNA-based indices, Sprattus sprattus, stable isotopes
National Category
Research subject
Marine Ecology
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)

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

Open Access in DiVA

No full text

Other links

Publisher's full textLink to doctoral thesis

Search in DiVA

By author/editor
Holmborn, ToweGorokhova, Elena
By organisation
Department of Systems Ecology
In the same journal
Marine Biology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 36 hits
ReferencesLink to record
Permanent link

Direct link