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Relationships among Nutrients, Chlorophyll-a, and Dissolved Oxygen in Agricultural Streams in Illinois

^a Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, 1102 S. Goodwin Ave, Urbana, IL 61801
^b School of Public and Environmental Affairs, Indiana University, 1315 E. Tenth St., Bloomington, IN 47405

View larger version (12K): [in a new window]   Fig. 1. Box plot of sestonic chl-a concentrations from March through November 2004 in three open-canopy (n = 75) and two shaded (n = 51) east-central Illinois agricultural streams.

View larger version (16K): [in a new window]   Fig. 2. Correlations between sestonic chl-a and (upper) total P and (lower) DRP (dissolved reactive P) from March through November 2004 in agricultural streams, excluding Site SFV.

View larger version (30K): [in a new window]   Fig. 3. Estimated discharge and mean periphytic chl-a (±1 SE) patterns for two open-canopy agricultural streams. Note difference in scale for discharge.

View larger version (13K): [in a new window]   Fig. 4. Correlations between periphytic chlorophyll-a and (upper) DRP and (lower) stream depth for two open-canopy agricultural streams (sites EMU and BLS) from March through November 2004.

View larger version (25K): [in a new window]   Fig. 5. Mean (±1 SE) abundance of filamentous algae as (upper) biomass and (lower) streambed coverage in two open-canopy agricultural streams.

View larger version (38K): [in a new window]   Fig. 6. Dissolved O2 patterns during (upper) late May and (lower) early November 2004 in two open-canopy and two shaded agricultural streams. Daily solar radiation values were measured at Site BLS (open canopy) and do not reflect available light at the water surface for the shaded sites.

View larger version (17K): [in a new window]   Fig. 7. Relationship between the diel range in dissolved O2 saturation and the biomass of (upper) filamentous algae or (lower) periphytic chlorophyll-a in two open-canopy agricultural streams during March through November 2004.

View larger version (26K): [in a new window]   Fig. 8. Continuous dissolved O2 concentration in an open-canopy agricultural stream (Site BLS) from late April through early December 2004. Horizontal line indicates the 5 mg L–1 Illinois dissolved O2 standard at the time of the study.