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- W2010656113 abstract "Stream biotopes (habitat types) have commonly been defined using subjective recognition of hydraulic and substrate conditions. In this study the relationship between groups of macroinvertebrates and subjectively defined biotopes was examined at three sites in the upper, middle, and lower reaches of the Buffalo River. Biotopes which were recognised included riffles, leaf packs in riffles, and a waterfall (erosional biotopes); and stony backwaters, marginal vegetation and sediments (depositional biotopes). Over 100 taxa were identified from the three sites, and an hierarchical classification of 138 samples was prepared using TWINSPAN. The first division distinguished between the invertebrate assemblages of the upper reaches and those of the middle/lower reaches. In the upper reaches, the waterfall was differentiated from all the other stream biotopes. In addition, seasonal changes in assemblage composition were recognised. Divisions in the middle/lower reaches differentiated between biotopes. Of the 27 most common taxa, 13 occurred in a single biotope in more than 50% of the samples in which they had been collected. Clearest species-biotope associations were riffle-dwelling mayflies and caddisflies, and stone-dwelling planaria and ancylid gastropods. Invertebrate assemblages were not always associated with subjectively identified biotopes, particularly in the narrow headwaters, where different biotopes tended to be smaller and less distinct. However, associations of assemblages with biotopes were found in the middle/lower reaches. This study shows that stratified random sampling regimes can be useful tools in stream research if the scale at which biotopes are recognised is clearly defined." @default.
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- W2010656113 date "1991-12-01" @default.
- W2010656113 modified "2023-09-26" @default.
- W2010656113 title "Are Macroinvertebrate Assemblages in the Buffalo River, Southern Africa, Associated with Particular Biotopes?" @default.
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- W2010656113 doi "https://doi.org/10.2307/1467662" @default.
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