, Volume 805, Issue 1, pp 291–310 | Cite as

Riparian forest modifies fuelling sources for stream food webs but not food-chain length in lowland streams of Denmark

  • I. González-Bergonzoni
  • P. B. Kristensen
  • A. Baattrup-Pedersen
  • E. A. Kristensen
  • A. B. Alnoee
  • T. Riis
Primary Research Paper


Several studies have shown that the origin of carbon fuelling food webs in streams depends on riparian cover type. In forested stream sites allochthonous resources fuel food webs, whereas autochthonous resources support biomass in grassland (open-canopy) stream sites. However, some studies suggest that autochthonous carbon (of highest quality) is preferentially assimilated regardless of riparian cover and that the food-chain length (FCL) may be larger in grassland than in forested sites. We used stable isotopes of carbon and nitrogen in adjacent grassland and forested reaches to compare the contribution of autochthonous vs. allochthonous resources to the biomass of the whole macroinvertebrate assemblage and to the most abundant taxa. Moreover, we compared the FCL between forested and grassland sites by estimating the trophic position of brown trout, Salmo trutta. Autochthonous support to macroinvertebrate biomass was higher in grassland than in forested sites, often changing from a dominantly autochthonous to an allochthonous-generated biomass from grassland to forested. This held true for the whole macroinvertebrate assemblage and for specific species. FCL remained similar between reach types. Our study suggests that autochthonous resources are assimilated to a higher extent when their availability increases with canopy openness but allochthonous carbon sustain macroinvertebrate biomass in forested reaches.


Resource subsidy Allochthonous detritus Stable isotopes Bayesian mixing models Trophic position Carbon subsidies 



The authors are grateful for financial support from The Danish Natural Science Research Council (T. Riis Grant #272-09-0012), the Carlsberg Foundation (T. Riis Grant #2013_01_0258) and the European Union 7th Framework projects REFRESH under Contract No. 244121 and MARS under Contract No. 603378 (A. Baattrup-Pedersen). I. González-Bergonzoni received support from SNI (Agencia Nacional de Investigación e Innovación, ANII, Uruguay).

Supplementary material

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Supplementary material 1 (DOCX 56 kb)


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • I. González-Bergonzoni
    • 1
    • 2
    • 3
  • P. B. Kristensen
    • 4
  • A. Baattrup-Pedersen
    • 1
  • E. A. Kristensen
    • 5
  • A. B. Alnoee
    • 1
    • 4
  • T. Riis
    • 4
  1. 1.Department of BioscienceAarhus UniversitySilkeborgDenmark
  2. 2.Laboratorio de Etología, Ecología y EvoluciónInstituto de Investigaciones Biológicas Clemente EstableMontevideoUruguay
  3. 3.Departamento de Ecología y Evolución, Facultad de CienciasUniversidad de la RepúblicaMontevideoUruguay
  4. 4.Department of BioscienceAarhus UniversityAarhusDenmark
  5. 5.EnviDanSilkeborgDenmark

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