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Influence of functional feeding groups and spatiotemporal variables on the δ15N signature of littoral macroinvertebrates

Crenoma, F. et Pianas, D. et Lucotte, M. (2010). Influence of functional feeding groups and spatiotemporal variables on the δ15N signature of littoral macroinvertebrates. Hydrobiologia , 647 (1). p. 51-61. DOI: 10.1007/s10750-009-9798-5.

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Résumé

The δ15N trophic enrichment in littoral food webs is not well known despite the importance of macroinvertebrates in lacustrine energy fluxes. We wanted to assess the influence of functional feeding group (grazer, collector, shredder, predator, predator-hematophagous, predator-sucker) and spatiotemporal variables (year, month, station of sampling) on littoral macroinvertebrate δ15N signatures. For 2 years, during the plant growth period phytophilous littoral macroinvertebrates were sampled in Lake St. Pierre, a large fluvial lake of the St. Lawrence River, Québec, Canada. The δ15N analyses showed that station was the most important factor for explaining δ15N variation, followed by sampling month and functional feeding grou The organisms sampled in the stations of the south shore, which experienced greater macrophyte abundance, slower currents, and stronger NO3 depletion exhibited higher δ15N values than those sampled on the north shore. Grazer-to-predator δ15N enrichment valued 1.6 ‰, which is inferior to the 3.4 ‰ generally admitted in food-web research. Shredders exhibited the lowest δ15N values and predators-hematophagous the highest. δ15N signature of invertebrates increased 3 ‰ through the summer between May and September. Only samples collected within a short period should be pooled to avoid an error value equivalent to one trophic level (1.6) enrichment. Furthermore, it is recommended not to pool macroinvertebrate samples collected at stations with differing watershed land uses. © Springer Science+Business Media B.V. 2009.

Type de document: Article scientifique
Statut du texte intégral: Autre
Mots-clés libres: Food webs, Littoral zone, Macroinvertebrates, St. Lawrence River, Stable isotopes
Sujets: 3. Végétation, milieux humides
4. Faune
4. Faune > 4.1. Invertébré
Date de dépôt: 20 juin 2016 20:49
Dernière modification: 20 juin 2016 20:49
URI: http://belsp.uqtr.ca/id/eprint/163

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