The effect of riparian condition on invertebrate drift in mountain streams

The effect of stream riparian condition on invertebrate drift was examined in headwater streams of the Torpy River in north-central British Columbia, Canada. Forest harvesting provided the opportunity to examine drift within control streams (i.e., within intact forest), streams with 10 m foliated re...

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Bibliographic Details
Published in:	Aquatic sciences Vol. 69; no. 4; pp. 544 - 553
Main Authors:	HOOVER, Shelley E. R, SHANNON, Leanne G. W, ACKERMAN, Josef Daniel
Format:	Journal Article
Language:	English
Published:	Heidelberg Springer 01-12-2007 Springer Nature B.V
Subjects:	Animal and plant ecology Animal, plant and microbial ecology Aquatic drift Aquatic organisms Biological and medical sciences Clearcutting Creeks & streams Downstream Forestry Fresh water ecosystems Freshwater Fundamental and applied biological sciences. Psychology General aspects Invertebrata Invertebrates Stream banks Streams Synecology Trophic relationships Upstream Canada, British Columbia., Torpy R Canada, British Columbia Buffer zone Aquatic environment Riparian Forestry Mountain stream streams Stream Drift Aquatic invertebrates riparian zone Invertebrata riparian buffer
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Summary:	The effect of stream riparian condition on invertebrate drift was examined in headwater streams of the Torpy River in north-central British Columbia, Canada. Forest harvesting provided the opportunity to examine drift within control streams (i.e., within intact forest), streams with 10 m foliated reserve strips, streams with 10 m defoliated riparian reserve strips, and streams without riparian reserve strips (i.e., clear cut to the stream bank). The density (concentration) of aquatic invertebrates (individuals m^sup -3^) in the drift was significantly lower in streams with 10 m riparian reserves compared to control streams (P < 0.002), and this effect was stronger when the data were expressed in terms of flux (i.e., individuals m^sup -2^ s^sup -1^; P < 0.001). Terrestrial invertebrate drift density tended to be higher in treatment streams compared to control streams and the magnitude and variation of this pattern correlated with the 'openness' of forestry canopy (e.g., clear cut streams > 10 m defoliated > 10 m foliated). There was significantly more aquatic drift in downstream vs. upstream locations of control streams, but this pattern was reversed for harvested streams (P = 0.51) leading to a significant interaction term in the analysis (P = 0.046; which indicates that the upstream-downstream comparison differed significantly between control and treatment streams in this double-control design). These types of changes in the drift of aquatic and terrestrial invertebrates are known to affect stream ecosystems through trophic interactions among periphyton, benthic grazers, and fish. Consequently, both the quantity and quality of riparian reserve strips must be considered for the effective mitigation of forestry practices.[PUBLICATION ABSTRACT]
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1015-1621 1420-9055
DOI:	10.1007/s00027-007-0909-y