Affiliation:
1. Oregon State University, Department of Fisheries and Wildlife, 104 Nash Hall, Corvallis OR 97331, USA.
2. Oregon State University, Department of Forest Ecosystems and Society, Corvallis OR 97331, USA.
Abstract
Recovery from timber harvest is widespread across North America, but few studies have evaluated long-term stream responses to riparian harvest. We revisited five stream reach pairs where in 1976, periphyton chlorophyll a, predatory invertebrate biomass, and cutthroat trout (Oncorhynchus clarkii clarkii) biomass were elevated in reaches where canopies were more open following timber harvest. After four decades of riparian regeneration, mean canopy openness, chlorophyll a, predatory invertebrate biomass, and cutthroat trout biomass declined in harvested reaches relative to paired old-growth reference reaches. In one reach pair, the harvested reach remained more open than the control reach. In accordance with the hypothesis that light exerts strong controls on predator biomass via bottom-up processes in these forested headwaters, trout biomass was also greater in the harvested reach in this pair in 2014. Changes in large wood and pool area over this time interval do not account for chlorophyll a, predatory invertebrate biomass, or cutthroat trout biomass responses. These results provide empirical support for conceptual models relating changes in riparian canopy cover to primary production and bottom-up controls on consumer populations.
Publisher
Canadian Science Publishing
Subject
Aquatic Science,Ecology, Evolution, Behavior and Systematics
Reference56 articles.
1. Periphyton response to increased light and salmon carcass introduction in northern California streams
2. Arar, E.J., and Collins, G.B. 1997. In vitro determination of chlorophyll a and pheophytin a in marine and freshwater algae by fluorescence. In US Environmental Protection Agency Method 445.0, Revision 1.2. Cincinnati, Ohio.
3. Stream acidification and mortality of brook trout (Salvelinus fontinalis) in response to timber harvest in Catskill Mountain watersheds, New York, USA
4. Beschta, R.L., Bilby, R.E., Brown, G.W., Holtby, L.B., and Hofstra, T.D. 1987. Stream temperature and aquatic habitat: fisheries and forestry interactions. In Streamside management: Forestry and fishery interactions, Vol. 57. Edited by E.O. Salo and T.W. Cundy. University of Washington, Institute of Forest Resources, Seattle, Wash. pp. 191–232.
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