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- W1995981370 abstract "The longitudinal zonation patterns of invertebrate species were studied in the River Oriège (Pyrénées, France) from 920 to 819 m a.s.l. At 912 m a.s.l., the river receives hypolimnetic water diverted from a nearby reservoir lake, and the natural flow may be enhanced several times a day from 1 to 11 m3 s—1 in summer and winter, and from 5 to 15 m3 s—1 during spring spates. During hydropeaking, the water was cooled in summer and slightly warmed in winter, but this was attenuated 3500 m downstream from the plant. Invertebrate densities were recorded in July (end of spates) and October (low flow period) at ten sampling sites : a reference site upstream of the hydrostation's discharge point (site 1), and nine sites each 400 m below the outlet (sites 2—10). The longitudinal distribution of invertebrate taxa was studied using Factorial Analyses, taxa and sites were clustered using Analysis of Dynamic Cluster. The hydroelectric facility did not clearly modify the qualitative composition of the benthic fauna, but clearly affected the longitudinal zonation of several populations. The low abundance of several species below the outlet reflected the impact of both hydropeaking and zonation. These species were high mountain species, the density of which decreases towards downstream sites in the Pyrenees, and low mountain species, the density of which naturally decreases towards upstream sites. Some taxa disappeared in the regulated section, so their distribution in the River Oriège was primarily influenced by hydropeaking. Finally, some taxa preferentially lived in the lower section of the river where the impact of peaking flows was strongly attenuated, so their longitudinal distribution was first governed by their natural longitudinal zonation. Under this kind of river regulation (natural discharge and temperature except during periods of power generation, intermittent hydropeaking from a separate reservoir) modifications of the thermal regime had a minor effect on the population dynamics, unlike hydraulic disturbances which strongly influenced the structural attributes of benthic communities." @default.
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- W1995981370 date "2002-01-01" @default.
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- W1995981370 title "Influence of Intermittent Hydropeaking on the Longitudinal Zonation Patterns of Benthic Invertebrates in a Mountain Stream" @default.
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- W1995981370 doi "https://doi.org/10.1002/1522-2632(200201)87:1<47::aid-iroh47>3.0.co;2-9" @default.
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