Ilic, Maja ORCID: 0000-0002-8387-9932, Cordellier, Mathilde ORCID: 0000-0001-7376-4560 and Fink, Patrick ORCID: 0000-0002-5927-8977 (2021). Intrapopulation variability in a functional trait: Susceptibility ofDaphniato limitation by dietary fatty acids. Freshw. Biol., 66 (1). S. 130 - 142. HOBOKEN: WILEY. ISSN 1365-2427

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Abstract

Functional traits are measurable characteristics of an organism that have an impact on its fitness. Variation in functional traits between and among species has been suggested to represent the basis for competition and selection, thus allowing for evolution in natural populations. In freshwater ecosystems, the availability of essential polyunsaturated fatty acids (PUFAs), in particular omega 3- and omega 6-PUFAs, determines the food quality of phytoplankton for the herbivorous zooplanktonDaphnia, an unselective filter feeder. The content of such essential PUFAs in the phytoplankton is thus a functional phytoplankton trait affecting the trophic transfer efficiency and dynamics at the pelagic plant-herbivore interface. In turn, the susceptibility of consumers to become limited by the availability of essential PUFAs is a fitness-determining trait ofDaphniagenotypes, and variability of this herbivore trait may thus affect the daphnids' intrapopulation competition. To estimate the intrapopulation variation in susceptibility, we isolated clonal lines ofDaphnia longispinafrom a natural population and compared the strength of their limitation by dietary PUFA availability via standardised laboratory growth assays. We used a liposome supplementation technique to enrich a PUFA-poor green alga with essential omega 3- and omega 6-PUFAs and determined juvenile somatic growth rate of differentD. longispinagenotypes as a fitness proxy. As expected,D. longispinagenotypes that coexisted in a natural population differed markedly in their specific patterns of susceptibility to dietary PUFA availability. On average, theD. longispinapopulation was more strongly susceptible to limitations in the availability of the omega 6-PUFA arachidonic acid (20:4 omega 6) than to limitations in the availability of omega 3-PUFAs alpha-linolenic acid (18:3 omega 3) and eicosapentaenoic acid (20:5 omega 3). The ability to cope with PUFA limitation is thus a crucial trait that can probably affect intraspecific competition andDaphniapopulation structure. Therefore, we suggest that such intrapopulation variation in susceptibility to absence of dietary PUFAs might be one of the driving forces of natural selection and local adaptation among freshwater zooplankton.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Ilic, MajaUNSPECIFIEDorcid.org/0000-0002-8387-9932UNSPECIFIED
Cordellier, MathildeUNSPECIFIEDorcid.org/0000-0001-7376-4560UNSPECIFIED
Fink, PatrickUNSPECIFIEDorcid.org/0000-0002-5927-8977UNSPECIFIED
URN: urn:nbn:de:hbz:38-318073
DOI: 10.1111/fwb.13623
Journal or Publication Title: Freshw. Biol.
Volume: 66
Number: 1
Page Range: S. 130 - 142
Date: 2021
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 1365-2427
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
FOOD QUALITY; SEASONAL SUCCESSION; INTRASPECIFIC VARIABILITY; COMMUNITY ECOLOGY; GENETIC-VARIATION; RAPID EVOLUTION; LIFE-HISTORIES; TRADE-OFFS; DAPHNIA; GROWTHMultiple languages
Ecology; Marine & Freshwater BiologyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31807

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