restoration potential and effects on the neponset river
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Native and invasive mussels
Restoration potential and effects on the Neponset River
NepWRA
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Native bivalve species present
Elliptio complanata Pisidium spp.
Restoration problems 83 of 297 species extinct in North America
Most imperiled organisms (55% of species) IUCN Red listed Little funding available (2003 US$24k/sp.)
Sensitive to environment Habitat degradation
Dams, land use changes siltation, pollution Hydrologic regime
Flow, temperature Host specific dispersal Neponset-specific problems:
Toxic metals Summer low-flow conditions, high temperature Low clearance rate
Unlikely to solve eutrophication problem
Williams et al. 1993
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Comparison of clearance rates
Native Unionids: Low Density
0.006 to 2.327 mussels per m2
Filtration rate 1 to 2 l/hr/g AFDM
Total optimal clearance: ~23 l/m2/hr Invasive Dreissenids:
High Density 2.5 to 2.6x105 mussels per m2
Filtration rate ~5.8 l/hr/g AFDM
Total optimal clearance: ~5500 l/m2/hr
Future residents?D. polymorpha D. Rostriformis bugensis
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Usgs.gov
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