Universität zu Köln

Ilic, Maja ORCID: 0000-0002-8387-9932, Werner, Christian and Fink, Patrick ORCID: 0000-0002-5927-8977 (2019). Equal relevance of omega-3 and omega-6 polyunsaturated fatty acids for the fitness of Daphnia spp. Limnol. Oceanogr., 64 (6). S. 2512 - 2526. HOBOKEN: WILEY. ISSN 1939-5590

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Abstract

Essential polyunsaturated fatty acids (PUFAs) have been recognized as a crucial factor that determines the trophic transfer efficiency in plankton communities. As many animals cannot synthesize the classes of omega 3- and omega 6-PUFAs, the dietary availability of these PUFAs can constrain the fitness of freshwater zooplankton such as Daphnia spp. In particular, eicosapentaenoic acid (EPA, 20:5 omega 3) is considered to be a crucial determinant of the transfer of biomass at the freshwater plant-herbivore interface. In contrast to omega 3-PUFAs, the group of omega 6-PUFAs has previously been considered to be of less ecological relevance, although the potential role of the omega 6-PUFA arachidonic acid (ARA, 20:4 omega 6) remains controversial. To investigate its potential role, we conducted dose-response growth experiments with two Daphnia species, D. pulex and D. magna, supplemented with EPA or ARA, which allowed us to calculate EPA and ARA saturation thresholds for growth and reproduction of both Daphnia species. Our results provide evidence that not only the availability of omega 3-PUFAs, but also the availability of a omega 6-PUFA, namely ARA, can limit both the growth and reproduction of Daphnia spp. to an equal extent. The saturation thresholds for growth and reproduction were consistently, but not significantly, higher for EPA than for ARA in both Daphnia species. As shifts in phytoplankton community composition might result in environmental fluctuations in the dietary availability of omega 3- and omega 6-PUFAs, our findings present a significant step in understanding the consequences of the ongoing global biodiversity loss for trophic transfer efficiency at the phytoplankton-zooplankton interface.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ilic, Maja UNSPECIFIED orcid.org/0000-0002-8387-9932 UNSPECIFIED Werner, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, Patrick UNSPECIFIED orcid.org/0000-0002-5927-8977 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-129345
DOI:	10.1002/lno.11201
Journal or Publication Title:	Limnol. Oceanogr.
Volume:	64
Number:	6
Page Range:	S. 2512 - 2526
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1939-5590
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Zoologisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FOOD QUALITY; EICOSAPENTAENOIC ACID; GENE-EXPRESSION; GROWTH; MAGNA; LIMITATION; TEMPERATURE; PHYTOPLANKTON; PHOSPHORUS; ACCUMULATION Multiple languages Limnology; Oceanography Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12934