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- W2030503332 abstract "The Portneuf River (mean monthly discharge near mouth 1.4-15.4 m3/s) in southeastern Idaho, U.S.A., flows through an area of reduced precipitation (approx. 33 cm/year) and is dependent on underground aquifers and snowmelt runoff from the surrounding mountains for its water. The stream was examined at ten locations, distributed over its 156-km course, during the period 1967-1971. The Portneuf River is shown to have undergone a number of changes from its natural state as evidenced by alterations in water quality and the distribution of benthic invertebrates along the stream course. Of particular interest are changes brought about by the use of the stream for irrigation and by runoff from agricultural lands, factors whose effects are magnified by the semiarid conditions of the region and by poor soil-conservation practices. However, the stream also is affected by wastes from a sewage-treatment plant, phosphate-processing operations, and an assortment of scattered urban sources. Benthic invertebrates were collected during all four seasons by means of artificial substratum samplers and during summer and autumn by a qualitative dip-net technique. In general, the samplers were more effective in obtaining a representative picture ofthe fauna. However, neither procedure alone gave as much information as the combined results. The artificial substratum collections are not believed to be representative of the usual effects of stream devvatering by irrigation withdrawal in as much as the samplers provide refugia for the benthos during the periods of reduced habitat." @default.
- W2030503332 created "2016-06-24" @default.
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- W2030503332 date "1973-02-01" @default.
- W2030503332 modified "2023-09-25" @default.
- W2030503332 title "An ecological investigation of the Portneuf River, Idaho: a semiarid-land stream subjected to pollution" @default.
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- W2030503332 doi "https://doi.org/10.1111/j.1365-2427.1973.tb00059.x" @default.
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