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Titolo:
Effect of river management on colonially-nesting waterbirds in the Barmah-Millewa forest, south-eastern Australia
Autore:
Leslie, DJ;
Indirizzi:
State Forests New S Wales, Deniliquin, NSW 2710, Australia State Forests New S Wales Deniliquin NSW Australia 2710 W 2710, Australia
Titolo Testata:
REGULATED RIVERS-RESEARCH & MANAGEMENT
fascicolo: 1, volume: 17, anno: 2001,
pagine: 21 - 36
SICI:
0886-9375(200101/02)17:1<21:EORMOC>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARP CYPRINUS-CARPIO; EXPERIMENTAL MANIPULATIONS; WATERFOWL HABITAT; MURRAY; BILLABONGS; LESSONS; BIOMASS; IMPACTS; WALES;
Keywords:
environmental flows; landscape ecology; macrophytes; Murray-Darling Basin; wetlands;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Leslie, DJ State Forests New S Wales, POB 610, Deniliquin, NSW 2710, Australia State Forests New S Wales POB 610 Deniliquin NSW Australia 2710
Citazione:
D.J. Leslie, "Effect of river management on colonially-nesting waterbirds in the Barmah-Millewa forest, south-eastern Australia", REGUL RIVER, 17(1), 2001, pp. 21-36

Abstract

River management has affected the ability of colonially-nesting waterbirdsto reproduce in the Barmah-Millewa forest, south-eastern Australia. Relationships between reproductive performance and flow variability were quantified in order to establish the significance of the impact. The method of investigation involved: developing a conceptual framework describing four breeding-flow relationships (excellent, poor, abandoned and nil); obtaining measures for each relationship using annual breeding records (19 years; 1979-1997), habitat data (two traditional nest sites, one foraging area) and flow data (Murray River at Yarrawonga); and testing their predictive power at a landscape level. The effect of river management on the reproductive performance of colonially-nesting waterbirds was then assessed. Annual pulse dimensions in two runs produced by the monthly simulation model (natural and current flow; 1891-1992) were compared with the breeding-flow measures to obtain computer generated breeding level predictions. A major impact of river management was an 80% reduction in the frequency of successful breeding episodes compared to the natural precedent. The interval between breeding episodes during extended drought periods was identified as the most critical factor likely to affect the long-term stability or persistence of waterbird breeding in the forest. A literature review provided evidence of declining abundance and diversity of colonially-nesting waterbirds, and gave insight tothe timing and factors contributing to the decline of many species. The principal conclusion is that three river flow objectives need to be addressedto ensure the long-term stability or persistence of breeding populations in the forest. Copyright (C) 2001 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 02:20:29