Round hickorynut mussel limited by local bedrock chemistry
The , a federally threatened freshwater mussel listed under the Endangered Species Act, has its range in the Ohio River basin where this ecosystem lies.1, 2 The species prefers sand and gravel substrates in moderate-flow streams, but the bedrock here is primarily Pennsylvanian shale lacking significant limestone, which limits the dissolved calcium these mussels need to build shells.2
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