Invertebrate Drift in a Central Wisconsin Brook Trout Stream
File(s)
Date
1974Author
Braatz, David A.
Publisher
University of Wisconsin-Stevens Point
Metadata
Show full item recordAbstract
As part of a study evaluating the effects of removal of woody
streamside vegetation on trout streams, monthly drift samples were
collected in the Little Plover River during 1972 to determine taxa,
density, and seasonal changes in numbers of invertebrates in an upstream
meadow and two downstream brushy areas. Results of this drift
investigation favorably support the proposal of brush removal as a
technique for managing small trout streams.
Differences in drift between the meadow and successive downstream
brushy stations were: mean annual density of drifting organisms decreased
from 614 to 273 to 130 organisms/100 m3; drift biomass was
highest in August and decreased downstream from 4.00 to 1.34 to 0.07
g/100 m3 (wet weight); and the mean annual density of drifting detritus
decreased from 34.2 to 20.4 to 13.7 g/100 m3 (dry weight). Monthly
mean density of detritus was positively correlated with monthly mean
density of invertebrates, with r = 0.824.