Spatial variation in macrobenthic assemblages and their relationship with environmental factors in the upstream and midstream regions of the Heihe River Basin, China.

The results showed that the spatial divergence of the macrobenthic community was extremely significant from the upper reaches to the middle reaches regardless of the species composition or existing stock of macrobenthic fauna, which were closely related to the climate, geographical characteristics, and pollution status of the HRB.

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The spatial distribution of the species at the different points substantially varied, with an overall trend of the middle stream (37 species) > upper main stream (27 species) > upstream tributary (22 species).

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