seasonal weather-related hydrologic events (Perkins and Jones, 1994; Figueroa-Nieves ...... able data checking and summaries. Bob Black assisted with piece-.
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION AMERICAN WATER RESOURCES ASSOCIATION
INFLUENCE OF ENVIRONMENTAL FACTORS ON BIOTIC RESPONSES
TO NUTRIENT ENRICHMENT IN AGRICULTURAL STREAMS1
Terry R. Maret, Christopher P. Konrad, and Andrew W. Tranmer2
ABSTRACT: The influence of environmental factors on biotic responses to nutrients was examined in three diverse agricultural regions of the United States. Seventy wadeable sites were selected along an agricultural land use gradient while minimizing natural variation within each region. Nutrients, habitat, algae, macroinver tebrates, and macrophyte cover were sampled during a single summer low-flow period in 2006 or 2007. Continu ous stream stage and water temperature were collected at each site for 30 days prior to sampling. Wide ranges of concentrations were found for total nitrogen (TN) (0.07-9.61 mg ⁄ l) and total phosphorus (TP) (
