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Polyunsaturated fatty acids in zooplankton: variation due to taxonomy and trophic position
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 ofFood quantity and/or quality limitation should be expected in nearly all lakes.
FUNDAMENTAL CONNECTIONS AMONG ORGANISM C:N:P STOICHIOMETRY, MACROMOLECULAR COMPOSITION, AND GROWTH
Whereas it is acknowledged that the C:N:P stoichiometry of consumers and their resources affects both the structure and the function of food webs, and eventually influences broad-scale processes su…
Fatty Acid Ratios in Freshwater Fish, Zooplankton and Zoobenthos – Are There Specific Optima?
Two groups of polyunsaturated fatty acids (PUFA), termed omega-3 and omega-6 in food (or here as n-3 and n-6 PUFA, respectively), are essential for all vertebrates and probably also for nearly all…
The influence of food quality (P :C ratio) on RNA:DNA ratio and somatic growth rate of Daphnia
The response in RNA : DNA ratio to changes in food quality is rapid and consistent with previously reported patterns for somatic growth rate, and enables shortterm experiments that reduces the problems with keeping both food quantity and quality constant during incubation.
Phosphorus distribution in three crustacean zooplankton species
The distribution of phosphorus was assessed in homogeneously P-33-labeled Daphnia magna,Daphnia galeata and Eudiaptomus gracilis to establish an apples-to- apples relationship.
Effects of N : P loading ratios on phytoplankton community composition, primary production and N fixation in a eutrophic lake
1. The aim of this study was to assess the effects of different nitrogen (N) to phosphorus (P) loading ratios on phytoplankton community composition and primary production in a naturally eutrophic…
Fatty acid composition of consumers in boreal lakes – variation across species, space and time
Pelagic and profundal consumers showed stronger reliance on autochthonous resources than did their littoral counterparts as reflected by their higher ω3 to ω6 FA ratios, andaturated FAs were increasingly retained with trophic levels, and saturated FAs gradually reduced.
Food quantity and quality regulation of trophic transfer between primary producers and a keystone grazer (Daphnia) in pelagic freshwater food webs
The transfer of energy and nutrients from plants to animals is a key process in all ecosystems. In lakes, inefficient transfer of primary producer derived energy can result in low animal growth rat…
Ecological stoichiometry of Eurasian perch - intraspecific variation due to size, habitat and diet
The stoichiometry of heterotrophs is generally considered to vary only little, but the turnover and distribution of energy and nutrients in food webs is influenced by consumer stoichiometric influences.
Zooplankton Feeding on the Nuisance Flagellate Gonyostomum semen
- Karin S. L. Johansson, T. Vrede, Karen Lebret, Richard K. Johnson
- Environmental SciencePloS one
- 7 May 2013
There is a potential for grazer control of G. semen, and the high grazing rates of two of the taxa in the authors' experiment imply that some of the nutrients and energy taken up by the large bloom-forming flagellate Gonyostomum semen can be transferred directly to higher trophic levels, although the predominance of small cladocerans during blooms may limit the importance ofG.