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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Drift responses of gammarus (amphipoda) to experimental flow fluctuation in a
Drift responses of gammarus (amphipoda) to experimental flow fluctuation in a
Flow regime is widely recognized as a significant habitat factor to aquatic species. Flow fluctuation below a dailyregulated
hydropower plants (hydro-peaking flow) can exert impacts to benthic invertebrates, including the change of
community structure and the drift rates. A series of experiments were conducted in a mountain stream to assess
Gammarus sp. drift responses to flow fluctuation. T-cock weirs and pipes were used to manipulate the flow in
experimental channels. Two flow patterns were introduced, including natural flow and pulse flow from 0.210-3 m3s-1 to
6.1510-3 m3s-1. Drift samples were collected during experiments using drift net located in pools; riffles and glides. Drift
densities were calculated. The experiment indicated that: (1) Gammarus sp. was the dominant species of drift
macroinvertebrates in Yaojikan steam, which accounted more than 50% of all collected individuals during two
experiments; (2) Macroinvertebrates drift differed during flow disturbance, more drift individuals were collected and drift
density presented a periodical fluctuation with flow fluctuation. (3) Gammarus sp. drifts varied differently among different
habitat types under fluctuating flow regime. Fewer drift Gammarus sp. were collected from pools and more drift
individuals were sampled form riffles and glide. The results indicated that Gammarus sp. drifts were determined by the
flow regime and habitat type and interactions between them. Flow regime varied with time to disturbance and can
definitely be an essential factor affecting drift of Gammarus sp. In addition to temporal consideration, the spatial
distribution of habitats is also affect drift to a large extent.
File Size : 327,088 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 17/08/2015
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