Journal
RIVER RESEARCH AND APPLICATIONS
Volume 27, Issue 1, Pages 99-112Publisher
WILEY
DOI: 10.1002/rra.1342
Keywords
regulated; macroinvertebrate; drift; seasonal; longitudinal; diversity; abundance
Categories
Funding
- Fisheries and Oceans Canada
- Brookfield Renewable Power Inc.
- Canadian Foundation for Innovation/Ontario Innovation Trust (in collaboration with Sault College and ULERN)
Ask authors/readers for more resources
The downstream effects of hydroelectric dam operations on the abundance and diversity of the macroinvertebrate drift community of a regulated river were compared to that of an unregulated river, longitudinally and across three seasons. The regulated river operated under minimum flow and ramping rate (rate of change of flow) restrictions resulting in a 'modified peaking' regime, which means the facility could still peak, but at a slower rate and may not reach maximum turbine flows in the short time typically required to respond to market energy demand. The unregulated river had no dams or other water control structures. There was a trend of increasing abundance and diversity with distance from the dam on the regulated river, with no discernable trend along the unregulated river. While feeding guild proportions did not vary along the unregulated river, within the regulated river feeding guild proportions changed longitudinally as scrapers and collector gatherers increased, and filterers and predators decreased with distance downstream. The regulated river had similar or higher abundance across all seasons, with lower diversity in the spring. Seasonal average discharge was found to be lowest in summer on both rivers, with the regulated river benefiting from a minimum flow to help maintain higher abundance and diversity. Overall, our examination of the drifting invertebrate community on a regulated river support that operational constraints associated with modified peaking regimes helped mitigate the typical negative effects associated with river regulation. Copyright (C) 2010 Crown in the right of Canada and John Wiley & Sons, Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available