Abstract
Energy and organic matter flow in forested headwater stream trophic webs is generally more dependent on allochthonous than autochthonous organic matter. However, we propose that autochthonous organic matter significantly contributes to the development of primary consumers during periods when the riparian canopy is open. We determined bulk stable isotope signatures, fatty acid (FA) composition and carbon stable isotope ratios of individual FA (δ13CFA) of basal organic sources and nine major macroinvertebrate taxa sampled in a first-order forest stream (Massif Central, France) in early spring before the onset of vegetation growth. Our results from a Bayesian mixing model showed that most of the energy channeled to invertebrate consumers came from biofilm, bryophytes and fine benthic detrital particles (FBOM), and little from beech leaf litter. Estimates from a model using proportions of assimilated sources and δ13CFA signatures showed that the most common FAs (i.e. 16:0, 18:3ω3) were derived from organic sources proportionally relative to their assimilation by macroinvertebrates. In addition, it was clear that long-chain PUFAs (ARA and EPA) were obtained only from autochthonous sources through flexible feeding strategies. Our study highlights the dependence of stream macroinvertebrates on autochthonous primary production (including bryophytes) for their long-chain PUFA requirement.
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We thank two anonymous reviewers for their help in improving the article. We also thank Mrs F. Van Wyk de Vries for proofreading the English text.
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Labed-Veydert, T., Koussoroplis, AM., Bec, A. et al. Early spring food resources and the trophic structure of macroinvertebrates in a small headwater stream as revealed by bulk and fatty acid stable isotope analysis. Hydrobiologia 848, 5147–5167 (2021). https://doi.org/10.1007/s10750-021-04699-3
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DOI: https://doi.org/10.1007/s10750-021-04699-3