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agricultural algae algal biomass algal growth ash free dry average Bank Stability Index benthic Bobs Creek Brightbill canopy cover Chesapeake Bay Chesapeake Bay Program chlorophyll a concentrations CHLOROPHYLL a FREESTONE CHLOROPHYLL a LIMESTONE CHLOROPHYLL a NUMBER concentrations in freestone concentrations in limestone concentrations increased Concentrations of chlorophyll depositional areas dissolved oxygen East Mahantango Creek ecoregion environmental characteristics EXPLANATION FREESTONE RIFFLE free dry mass freestone and limestone FREESTONE DEPOSITIONAL CHLOROPHYLL FREESTONE RIFFLE CHLOROPHYLL freestone streams habitat increased fig Kishacoquillas Creek land LIMESTONE DEPOSITIONAL CHLOROPHYLL LIMESTONE RIFFLE CHLOROPHYLL limestone streams decreased Lower Susquehanna River mg/L milligrams NAWQA protocols nitrogen non-tidal NUMBER NEAR SYMBOL NWQL percent percentage of omnivorous periphyton Piedmont Relation of Algal Riffle and depositional River Basin study scraper invertebrates seven sites seven streams specific conductance Stevenson stream order streamflow streams in relation Susquehanna River Basin SYMBOL INDICATES SAMPLING TABLE U.S. Geological Survey width-to-depth ratio Wolman pebble