@article{fdi:010067257,
  title = {{E}ffects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed},
  author = {{S}anchez-{P}erez, {J}.{M}. and {G}erino, {M}. and {S}auvage, {S}. and {D}umas, {P}ascal and {M}aneux, {E}. and {J}ulien, {F}. and {W}interton, {P}. and {V}ervier, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e studied the effect of point-source and non-point-source pollution on the retention capacity of the stream and its link with the metabolic state (primary production and respiration) and invertebrates assemblages in a third order {M}editerranean stream. {T}wo experimental sites were chosen: one in the upper part of the catchment ({M}ontegut site) characterized by low concentrations in nitrate and phosphate and one in the lower part of the catchment ({L}ezat site) characterized by high nitrate and phosphorus concentrations. {B}oth experimental sites were located on reaches that included a {W}aste {W}ater {T}reatment {P}lant ({WWTP}) point nutrient source allowing discussion of the relative effects of point-source and non-point-source nutrients loads on ecosystem function (respiration and uptake rates) and aquatic organism assemblages. {NH}(4)(+)-{N}, and {PO}(4)(3-)-{P} uptake rates were determined using solute additions conducted at constant rates (short-term nutrient addition procedure) and {NO}(3)(-)-{N} uptake rates were determined using instantaneous solute addition (slug addition procedure). {R}ates of gross primary production ({GPP}) and ecosystem respiration were determined using the open system, two-stations diurnal oxygen change method. {B}enthic invertebrate communities were investigated for species and functional feeding groups diversities measurements. {R}esults show that autotrophy in the river results from nutrients of two distinct origins: point sources for phosphorus (urban area and {WWTP}) and non-point sources for nitrogen (agricultural zones) with local additions from {WWTP} inputs. {C}omparison between the two sites shows that the {WWTP} did not affect uptake rates, respiration or primary production of the ecosystem in the low-nutrient {M}ontegut reach despite increase of invertebrates communities biomass density. {I}nputs from the {WWTP}, in the high nitrate and phosphate {L}ezat reach, increased respiration, lower benthic biomass and led to changes in the species composition and did not affect uptake rates.},
  keywords = {{FRANCE} ; {ARIEGE}},
  booktitle = {},
  journal = {{A}nnales de {L}imnologie = {I}nternational {J}ournal of {L}imnology},
  volume = {45},
  numero = {2},
  pages = {79--92},
  ISSN = {0003-4088},
  year = {2009},
  DOI = {10.1051/limn/2009011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067257},
}