Invertebrate Drift in a Central Wisconsin Brook Trout Stream

[摘要] As part of a study evaluating the effects of removal of woodystreamside vegetation on trout streams, monthly drift samples werecollected in the Little Plover River during 1972 to determine taxa,density, and seasonal changes in numbers of invertebrates in an upstreammeadow and two downstream brushy areas. Results of this driftinvestigation favorably support the proposal of brush removal as atechnique for managing small trout streams.Differences in drift between the meadow and successive downstreambrushy stations were: mean annual density of drifting organisms decreasedfrom 614 to 273 to 130 organisms/100 m3; drift biomass washighest in August and decreased downstream from 4.00 to 1.34 to 0.07g/100 m3 (wet weight); and the mean annual density of drifting detritusdecreased from 34.2 to 20.4 to 13.7 g/100 m3 (dry weight). Monthlymean density of detritus was positively correlated with monthly meandensity of invertebrates, with r = 0.824.

[发布机构] University of Wisconsin-Stevens Point