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Titolo:
Aquatic food base response to the 1996 test flood below Glen Canyon Dam, Colorado River, Arizona
Autore:
Shannon, JP; Blinn, DW; McKinney, T; Benenati, EP; Wilson, KP; OBrien, C;
Indirizzi:
No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA No Arizona Univ Flagstaff AZ USA 86011 Biol Sci, Flagstaff, AZ 86011 USA Arizona Game & Fish Dept, Phoenix, AZ 85023 USA Arizona Game & Fish Dept Phoenix AZ USA 85023 Dept, Phoenix, AZ 85023 USA
Titolo Testata:
ECOLOGICAL APPLICATIONS
fascicolo: 3, volume: 11, anno: 2001,
pagine: 672 - 685
SICI:
1051-0761(200106)11:3<672:AFBRTT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
REGULATED DESERT RIVER; GEOMORPHOLOGICAL INFLUENCES; LOTIC COMMUNITIES; GRAND-CANYON; STREAM; DISTURBANCE; USA; ECOLOGY; DRIFT; CHLOROPHYLL;
Keywords:
adaptive management; aquatic food base; Cladophora; Colorado River; desert biome; discharge; disturbance; flood; Glen Canyon Dam; macroinvertebrates; organic drift; river regulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Shannon, JP No Arizona Univ, Dept Biol Sci, POB 5640, Flagstaff, AZ 86011 USA No Arizona Univ POB 5640 Flagstaff AZ USA 86011 , AZ 86011 USA
Citazione:
J.P. Shannon et al., "Aquatic food base response to the 1996 test flood below Glen Canyon Dam, Colorado River, Arizona", ECOL APPL, 11(3), 2001, pp. 672-685

Abstract

We examined the impact of the 1996 test flood released from Glen Canyon Dam (GCD) on the aquatic food base in the Colorado River through Grand CanyonNational Park, Arizona, USA, Benthic scour and entrainment of both primaryand secondary producers occurred at all study sites along the 385-km rivercorridor. The majority of the organic drift occurred within the first 48 hof the test flood with the arrival of the hydrostatic wave. Recent macrophyte colonizers (Chara, Potamogeton, and Elodea) of fine sediment in the tailwaters were scoured from the channel bottom, with recovery to pre-flood estimates within 1-7 months depending on taxa. Macroinvertebrates and filamentous algae recovered within three months depending on taxa. The test flood removed suspended particles from the water column and increased water clarity, which enhanced benthic recovery. The test-flood hydrograph was designedprimarily as an experiment in sand transport and occurred during a period of sustained high releases from GCD starting in June 1995 due to above-average inflow into Lake Powell. We discuss the implications of the hydrograph shape, pre- and post-riverine conditions, and the slow response time of biological resources for design of aquatic ecosystem experiments.

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Documento generato il 01/04/20 alle ore 20:58:41