environmental circumstances at any level in a stream are continuously influenced by conditions at points upstream, biophysical controls on the distribution and abundance of riverine biota should be examined in the context of the stream community and its landscape setting (Hynes, 1975). 1.three). For example, sure species of aquatic bugs reside solely in the chilly, rocky environs of cascading headwater streams in the excessive mountains (rhithron environments), whereas different species are discovered solely in the a lot hotter waters of the often sandy,
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