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Riverscour communities are open, rocky (bedrock, cobble, boulder, or mix) riparian communities dominated by shrubs, herbs, and grasses. They differ from sandbars and gravel bars in being highly physically stable over long periods of time, meaning they don’t shift or disappear frequently. Due to their stability and the fact that they are kept open by periodic flash floods, they often support relictual associations of species that are often rare or disjunct from other regions. Those in the Eastern Deciduous Forest region of the southeastern US are particularly interesting because by their very nature they are island-like in distribution, both within a given stream system and obviously between two separate streams. Most southeastern cobble bars are entrenched in deep gorges in mountainous regions and are sandwiched between large tracts of dense forests and boulder-strewn rivers. Read more...
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