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dc.contributor.authorGuo, Fen
dc.contributor.authorEbm, Nadine
dc.contributor.authorBunn, Stuart E
dc.contributor.authorBrett, Michael T
dc.contributor.authorHager, Hannes
dc.contributor.authorKainz, Martin J
dc.date.accessioned2021-08-16T01:14:41Z
dc.date.available2021-08-16T01:14:41Z
dc.date.issued2021
dc.identifier.issn0021-8790
dc.identifier.doi10.1111/1365-2656.13574
dc.identifier.urihttp://hdl.handle.net/10072/406875
dc.description.abstractThere is growing recognition of the importance of food quality over quantity for aquatic consumers. In streams and rivers, most previous studies considered this primarily in terms of the quality of terrestrial leaf litter and importance of microbial conditioning. However, many recent studies suggest that algae are a more nutritional food source for riverine consumers than leaf litter. To date, few studies have quantified longitudinal shifts in the nutritional quality of basal food resources in river ecosystems and how these may affect consumers. We conducted a field investigation in a subalpine river ecosystem in Austria to investigate longitudinal variations in diet quality of basal food sources (submerged leaves and periphyton) and diet source dependence of stream consumers (invertebrate grazers, shredders, filterers and predators, and fish). Fatty acid (FA) profiles of basal food sources and their consumers were measured. Our results indicate systematic differences between the FA profiles of terrestrial leaves and aquatic biota, i.e., periphyton, invertebrates and fish. Submerged leaves contained very low proportions of long-chain polyunsaturated fatty acids (LC-PUFA), which were conversely rich in aquatic biota. While the FA composition of submerged leaves remained similar among sites, the LC-PUFA of periphyton increased longitudinally, which was associated with increasing nutrients from upstream to downstream. Longitudinal variations in periphyton LC-PUFA were reflected in the LC-PUFA of invertebrate grazers and shredders, and further tracked by invertebrate predators and fish. However, brown trout (Salmo trutta) contained a large proportion of docosahexaenoic acid (DHA, 22:6ω3), a LC-PUFA almost entirely missing in basal sources and invertebrates. The fish accumulated eicosapentaenoic acid (EPA, 20:5ω3) from invertebrate prey and may use this FA to synthesize DHA. Our results provide a nutritional perspective for river food web studies, emphasizing the importance of algal resources to consumer somatic growth and the need to account for the longitudinal shifts in the quality of these basal resources.
dc.description.peerreviewedYes
dc.languageeng
dc.publisherWiley
dc.relation.ispartofjournalJournal of Animal Ecology
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchFreshwater ecology
dc.subject.fieldofresearchAgricultural, veterinary and food sciences
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode31
dc.subject.fieldofresearchcode310304
dc.subject.fieldofresearchcode30
dc.subject.keywordsBrown trout
dc.subject.keywordsDiatoms
dc.subject.keywordsFatty acids
dc.subject.keywordsFood quality
dc.subject.keywordsFood webs
dc.titleLongitudinal variation in the nutritional quality of basal food sources and its effect on invertebrates and fish in subalpine rivers
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationGuo, F; Ebm, N; Bunn, SE; Brett, MT; Hager, H; Kainz, MJ, Longitudinal variation in the nutritional quality of basal food sources and its effect on invertebrates and fish in subalpine rivers, Journal of Animal Ecology, 2021
dc.date.updated2021-08-13T01:33:07Z
dc.description.versionAccepted Manuscript (AM)
gro.description.notepublicThis publication has been entered as an advanced online version in Griffith Research Online.
gro.rights.copyright© 2021 John Wiley & Sons Ltd. This is the peer reviewed version of the following article: Longitudinal variation in the nutritional quality of basal food sources and its effect on invertebrates and fish in subalpine rivers, Journal of Advanced Nursing, 2021, which has been published in final form at https://doi.org/10.1111/1365-2656.13574. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
gro.hasfulltextFull Text
gro.griffith.authorBunn, Stuart E.


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