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Erratum to: Relationships between RNA content and egg production rate in Acartia bifilosa (Copepoda, Calanoida) of different spatial and temporal origin
Stockholms universitet, Naturvetenskapliga fakulteten, Systemekologiska institutionen.
Stockholms universitet, Naturvetenskapliga fakulteten, Systemekologiska institutionen.
2008 (Engelska)Ingår i: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 153, nr 5, s. 1007-1008Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2008. Vol. 153, nr 5, s. 1007-1008
Identifikatorer
URN: urn:nbn:se:su:diva-29479DOI: 10.1007/s00227-007-0887-6OAI: oai:DiVA.org:su-29479DiVA, id: diva2:233484
Tillgänglig från: 2009-09-01 Skapad: 2009-09-01 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. Zooplankton growth and trophic linkages: Implications for fish feeding conditions in the Baltic Sea
Öppna denna publikation i ny flik eller fönster >>Zooplankton growth and trophic linkages: Implications for fish feeding conditions in the Baltic Sea
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of System Ecology, Stockholm University, 2009. s. 38
Nyckelord
AARS activity, biochemical markers, Clupea harengus, copepod physiology, food web interactions, non-indigenous species, RNA-based indices, Sprattus sprattus, stable isotopes
Nationell ämneskategori
Ekologi
Forskningsämne
marin ekologi
Identifikatorer
urn:nbn:se:su:diva-29485 (URN)978-91-7155-908-1 (ISBN)
Disputation
2009-10-14, G-salen, Arrheniuslaboratorierna, Svante Arrhenius väg 16, Stockholm, 09:30 (Engelska)
Opponent
Handledare
Anmärkning

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

Tillgänglig från: 2009-09-22 Skapad: 2009-09-01 Senast uppdaterad: 2012-10-31Bibliografiskt granskad

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Holmborn, ToweGorokhova, Elena
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