@article{fdi:010066687,
  title = {{S}table isotopes reveal food web modifications along the upstream-downstream gradient of a temperate stream},
  author = {{H}ette-{T}ronquart, {N}. and {B}elliard, {J}. and {T}ales, {E}. and {O}berdorff, {T}hierry},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he upstream-downstream gradient ({UDG}) is a key feature of streams. {F}or instance food webs are assumed to change from upstream to downstream. {W}e tested this hypothesis in a small {E}uropean river catchment (937 km(2)), and examined whether food web modifications are related to structural (i.e. food web composition) or functional changes (i.e. alteration of linkages within the web). {W}e adopted a double approach at two levels of organisation (assemblage and species levels) using two isotopic metrics (isotopic space area and isotopic niche overlap), and proposed a new hypothesis-testing framework for exploring the dominant feeding strategy within a food web. {W}e confirmed that the {UDG} influenced stream food webs, and found that food web modifications were related to both structural and functional changes. {T}he structural change was mainly related to an increase in species richness, and induced functional modifications of the web (indirect effect). {I}n addition, the {UDG} also modified the functional features of the web directly, without changing the web composition. {T}he proposed framework allowed relating the direct effect of the {UDG} to a diet specialisation of the species, and the indirect effect via the structural changes to a generalist feeding strategy. {T}he framework highlights the benefits of conducting the double approach, and provides a foundation for future studies investigating the dominant feeding strategy that underlies food web modifications.},
  keywords = {{F}ood webs ; {S}table isotopes ; {L}ongitudinal gradient ; {S}pecies richness ; {F}ish density ; {S}tream ecology ; {FRANCE}},
  booktitle = {},
  journal = {{A}quatic {S}ciences},
  volume = {78},
  numero = {2},
  pages = {255--265},
  ISSN = {1015-1621},
  year = {2016},
  DOI = {10.1007/s00027-015-0421-8},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066687},
}