Universität zu Köln

Sikora, Anna B., Petzoldt, Thomas, Dawidowicz, Piotr ORCID: 0000-0001-8385-6215 and von Elert, Eric ORCID: 0000-0001-7758-716X (2016). Demands of eicosapentaenoic acid (EPA) in Daphnia: are they dependent on body size? Oecologia, 182 (2). S. 405 - 418. NEW YORK: SPRINGER. ISSN 1432-1939

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Abstract

Fatty acids contribute to the nutritional quality of the phytoplankton and, thus, play an important role in Daphnia nutrition. One of the polyunsaturated fatty acids (PUFAs)--eicosapentaenoic acid (EPA)--has been shown to predict carbon transfer between primary producers and consumers in lakes, suggesting that EPA limitation of Daphnia in nature is widespread. Although the demand for EPA must be covered by the diet, the demand of EPA in Daphnia that differ in body size has not been addressed yet. Here, we hypothesize that the demand for EPA in Daphnia is size-dependent and that bigger species have a higher EPA demand. To elucidate this, a growth experiment was conducted in which at 20 A degrees C three Daphnia taxa (small-sized D. longispina complex, medium-sized D. pulicaria, and large-bodied D. magna) were fed Synechococcus elongatus supplemented with cholesterol and increasing concentrations of EPA. In addition, fatty acid analyses of Daphnia were performed. Our results show that the saturation threshold for EPA-dependent growth increased with increasing body size. This increase in thresholds with body size may provide another mechanism contributing to the prevalence of small-bodied cladocera in warm habitats and to the midsummer decline of large cladocera in eutrophic water bodies.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sikora, Anna B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petzoldt, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Dawidowicz, Piotr UNSPECIFIED orcid.org/0000-0001-8385-6215 UNSPECIFIED von Elert, Eric UNSPECIFIED orcid.org/0000-0001-7758-716X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-261788
DOI:	10.1007/s00442-016-3675-5
Journal or Publication Title:	Oecologia
Volume:	182
Number:	2
Page Range:	S. 405 - 418
Date:	2016
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-1939
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYUNSATURATED FATTY-ACIDS; FRESH-WATER HERBIVORE; FOOD QUALITY; CARBON TRANSFER; LIFE-HISTORIES; TEMPERATURE; GROWTH; ZOOPLANKTON; LIMITATION; MAGNA Multiple languages Ecology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26178