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Titolo:
REDUCING FLOWS IN THE NECHAKO RIVER (BRITISH-COLUMBIA, CANADA) - POTENTIAL RESPONSE OF THE MACROPHYTE COMMUNITY
Autore:
FRENCH TD; CHAMBERS PA;
Indirizzi:
UNIV ALBERTA,DEPT BIOL SCI EDMONTON AB T6G 2E9 CANADA NATL HYDROL RES INST SASKATOON SK S7N 3H5 CANADA
Titolo Testata:
Canadian journal of fisheries and aquatic sciences
fascicolo: 10, volume: 54, anno: 1997,
pagine: 2247 - 2254
SICI:
0706-652X(1997)54:10<2247:RFITNR>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
STREAM; DOWNSTREAM; DAMS; IMPOUNDMENTS; VEGETATION; RESERVOIR; SECTIONS; TEES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
T.D. French e P.A. Chambers, "REDUCING FLOWS IN THE NECHAKO RIVER (BRITISH-COLUMBIA, CANADA) - POTENTIAL RESPONSE OF THE MACROPHYTE COMMUNITY", Canadian journal of fisheries and aquatic sciences, 54(10), 1997, pp. 2247-2254

Abstract

Approximately 50% of the Nechako River's flow was permanently diverted into another watershed in the early 1950s. Up to 50% of the remaining flow may be diverted in the future. To give insight as to how futureand past flow reductions will/have affect(ed) macrophyte abundance, we first developed equations relating average summer channel speed to cross-sectional biomass and bottom cover from data collected at 26 sites. The average summer channel speed at each site was then estimated assuming flows (at Fort Fraser) of 408 m(3).s(-1) (natural), 165 m(3).s(-1) (1952-1990 average), and two future scenarios: 120 and 60 m(3).s(-1). We then used these estimates in our equations to compute abundanceunder the various flow regimes. Our models suggest that flow has Little influence on macrophyte abundance in two fast-flowing reaches, which together account for 50% of the river's length. In contrast, the diversion was predicted to have increased biomass and cover by, on average, 66 g.m(-2) and 15%, respectively, in a slow-flowing reach accounting for 20% of the river's length. Biomass and cover in this reach couldincrease by an additional 65 g.m(-2) (or 240 g.m(-2)) and 9% (or 29%)if flows are reduced to 120 m(3).s(-1) (or 60 m(3).s(-1)).

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Documento generato il 19/09/20 alle ore 09:18:55