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The influence of food quality (P:C ratios) on RNA:DNA ratios and somatic growth rate of Daphnia
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution.
2002 Ingår i: Limnology and Oceanography, Vol. 47, s. 487-494Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2002. Vol. 47, s. 487-494
Identifikatorer
URN: urn:nbn:se:uu:diva-95732OAI: oai:DiVA.org:uu-95732DiVA, id: diva2:170057
Tillgänglig från: 2007-04-11 Skapad: 2007-04-11Bibliografiskt granskad
Ingår i avhandling
1. Food Quality Effects on Zooplankton Growth and Energy Transfer in Pelagic Freshwater Food Webs
Öppna denna publikation i ny flik eller fönster >>Food Quality Effects on Zooplankton Growth and Energy Transfer in Pelagic Freshwater Food Webs
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Effekter av födokvalitet på djurplanktons tillväxt och på energiöverföringen i födovävar i sjöar
Abstract [en]

Poor food quality can have large negative effects on zooplankton growth and this can also affect food web interactions. The main aims of this thesis were to study the importance of different food quality aspects in Daphnia, to identify potentially important differences among zooplankton taxa, and to put food quality research into a natural context by identifying the importance of food quality and quantity in lakes of different nutrient content.

In the first experiment, the RNA:DNA ratio was positively related to the somatic growth rate of Daphnia, supporting a connection between P content, RNA content, and growth rate. The second experiment showed that EPA was important for Daphnia somatic growth, and 0.9 µg EPA mg C-1 was identified as the threshold below which negative effects on Daphnia growth occurred.

A field survey identified patterns in the PUFA content of zooplankton that could be explained by taxonomy and trophic position. Cladocera enriched EPA and ARA relative to seston, and Copepoda primarily enriched DHA. In a whole-lake experiment, gentle fertilization of an oligotrophicated reservoir increased the seston P content and the biomass of high quality phytoplankton (Cryptophyceae, high EPA content). This was followed by increases in zooplankton and fish biomasses.

An empirical model based on data from a literature survey predicted that food quantity is most important for zooplankton growth in oligotrophic lakes, and that food quality factors are more important in eutrophic lakes. Thus, zooplankton growth, and energy transfer efficiency in the food web, is predicted to be highest in mesotrophic lakes. The results predict that the strength and nature of food quantity and quality limitation of Daphnia growth varies with lake trophic state, and that some combination of food quantity and/or quality limitation should be expected in nearly all lakes.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2007. s. 43
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 292
Nyckelord
Ecology, elemental stoichiometry, phosphorus, polyunsaturated fatty acids, EPA, oligotrophic lakes, empirical modelling, Daphnia, Cladocera, Copepoda, Ekologi
Nationell ämneskategori
Ekologi
Identifikatorer
urn:nbn:se:uu:diva-7811 (URN)978-91-554-6859-0 (ISBN)
Disputation
2007-05-04, Zootissalen, Gamla Zoologen, Norbyvägen 18, Uppsala, 10:00
Opponent
Handledare
Tillgänglig från: 2007-04-11 Skapad: 2007-04-11 Senast uppdaterad: 2016-04-28Bibliografiskt granskad

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