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Titolo:
Exclusion experiments with backwater invertebrate communities of the GreenRiver, Utah
Autore:
Collins, KP; Shiozawa, DK;
Indirizzi:
Brigham Young Univ, Dept Zool, Provo, UT 84602 USA Brigham Young Univ Provo UT USA 84602 niv, Dept Zool, Provo, UT 84602 USA
Titolo Testata:
WESTERN NORTH AMERICAN NATURALIST
fascicolo: 2, volume: 61, anno: 2001,
pagine: 149 - 158
SICI:
1527-0904(200104)61:2<149:EEWBIC>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
FISH PREDATION; MACROINVERTEBRATE COMMUNITIES; COLORADO SQUAWFISH; PREY; STREAM; COMPLEXITY; DIVERSITY; EVENNESS;
Keywords:
predation; backwater; invertebrate communities; Green River; Colorado River drainage; cage effects;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Collins, KP Fullerton Coll, Div Nat Sci, Fullerton, CA 92832 USA FullertonColl Fullerton CA USA 92832 Fullerton, CA 92832 USA
Citazione:
K.P. Collins e D.K. Shiozawa, "Exclusion experiments with backwater invertebrate communities of the GreenRiver, Utah", WEST N AM N, 61(2), 2001, pp. 149-158

Abstract

The role of biotic interactions in structuring freshwater invertebrate communities has been extensively studied but with mixed results. For example, fish effects on invertebrates are most pronounced in pelagic and soft-sediment benthic habitats that lack structural complexity, yet appear insignificant in benthic rubble habitats. Backwaters of the Green Rivet) Utah. are shallow, structurally simple, quiet-water embayments adjacent to the river These habitats form in middle to late summer and are colonized by benthic andepibenthic invertebrates that produce standing crops significantly higher than the river Backwaters are also utilized by a large number of fish species. We used cages to determine if selective exclusion of backwater organisms could significantly change invertebrate community structure. Results showed that backwater invertebrate community components changed significantly in response to exclusion treatments. Two taxa (both predators), the chironomid genus Tanypus (Diptera: Chironomidae) and the corixid genus Trichocorixa(Hemiptera: Corixidae), increased in density in exclusion cages while cladocerans, immature copepods, the cyclopoid copepod Eucyclops speratus, and the chironomid genus Procladius all decreased in density. Diversity of adultcopepods was reduced by exclusion treatments, though density of only a single species changed significantly.

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Documento generato il 26/01/20 alle ore 10:16:01