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Publication Title:   Canopy removal and sediment accumulation perturbation in Northwest streams [Abstract]

Year:  1981     Status:  Published     Publication Type:  Abstract

H. J. Andrews Publication Number:  1866

Citation:  Hawkins, Charles. 1981. Canopy removal and sediment accumulation perturbation in Northwest streams [Abstract]. Bulletin of the Ecological Society of America. 62(2): 74-75.

Online PDF:  http://andrewsforest.oregonstate.edu/pubs/pdf/pub1866.pdf

Abstract:  Modification of riparian canopies and accumulation of fine sediment in streams are two man-inducedperturbations that are ubiquitous in watersheds of the Pacific Northwest. Results from a two-year fieldstudy show that both sediment concentration and degree of shading affect structure, functional characterand abundance of invertebrate communities and production of vertebrate populations. Although inver-tebrate community structure was not always clearly correlated with presence or absence of a canopy,functional character was. Production and abundance of the vertebrate fauna were related to shifts in functional organization and abundance of the invertebrate community: open sites consistently had moreinvertebrate herbivores and greater biomass of vertebrates than shaded sites. Among shaded streams,both invertebrate and vertebrate abundances were negatively correlated with percent fine sediment (<1mm). Among streams with no canopy, significant correlations between sediment and abundance werefound for some vertebrate species but not for total invertebrates or total vertebrates.

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Hawkins ,  Charles   P.

Aquatic invertebrates
Biomass (invertebrates)
Biomass (vertebrates)
Canopy communities
Community structure
Forest canopy
Functional groups
Riparian vegetation
Stream communities

Pacific Northwest