Running heading: Controls of invertebrate drift in a large regulated river
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Supporting Information
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Figure S1. Graph showing the relationship between drift concentration and benthic density. Red
circles represent drift measurements that occurred when discharge was greater than the mean
discharge of our individual sampling bouts (317 m3·s-1). Note that Simulium drift concentration
decreased as a function of discharge, hence black circles that depict measurements taken at lower
discharges generally fall above the red circles. Drift densities for other taxa were all positively
related to discharge, and hence the red circles generally fall above the black circles.
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Running heading: Controls of invertebrate drift in a large regulated river
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Figure S2 Graphs showing drift concentrations as a function of discharge. Red circles represent
measurements of drift concentrations that occurred when benthic densities were greater than the
mean benthic density whereas black circles represent measurements of drift concentrations that
occurred when benthic densities were less than the median benthic density. Mean benthic
densities over our 1.5 year study were: 7363·m-2 for Chironomidae, 1506·m-2 for Gammarus,
575·m-2 for Simulium, and 26,100·m-2 for Potamopyrgus. Drift concentrations for all taxa were
positively related to benthic density, hence the red circles (depicting relatively high benthic
densities) fall above the black circles.
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