Hydrobiologia

, Volume 647, Issue 1, pp 51–61 | Cite as

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

ECOSYSTEM STUDIES OF THE ST LAWRENCE RIVER

Abstract

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 group. 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.

Keywords

Macroinvertebrates Food webs Littoral zone Stable isotopes St. Lawrence River 

Notes

Acknowledgments

This study was supported by NSERC-COMERN grants to F.C., D.P., and M.L. Scholarships from Collectivité Territoriale de Corse, UQAM-FARE, and GÉOTOP were helpful to F.C. We thank Serge Paquet for his help with statistics, as well as Agnieszka Adamowicz, Jean-François Hélie, and Jennifer McKay for stable isotopes analysis. Finally, we are grateful to our field assistants Catherine Bourdeau, Myrianne Joly, Renaud Manuguerra-Gagné, Roxanne Rochon, and Annabelle Warren.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.GÉOTOPUniversité du Québec à MontréalMontrealCanada

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