Invasion of Egeria into the Hawkesbury-Nepean River, Australia

Roberts, Daniel E. and Church, A.G. and Cummins, S.P. (1999) Invasion of Egeria into the Hawkesbury-Nepean River, Australia. Journal of Aquatic Plant Management, 37, pp. 31-34.

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The Hawkesbury-Nepean River in New South Wales (NSW), Australia, is the largest river system in the Sydney metropolitan area, and it drains most of the developing areas to the west. This catchment is under increasing pressure from urban expansion and the river frequently experiences extended periods of low flows due to a combination of extensive river regulation and the Australian temperate climate. Added to this, the river and several of its tributaries receive treated sewage and stormwater from various sources. Habitats and biota within the Hawkesbury-Nepean River catchment have been altered since European settlement and many introduced species have spread throughout the terrestrial and aquatic environment (Recher et al. 1993). Submersed macrophyte assemblages within the river have undergone significant changes in their distribution and abundance due to eutrophication, habitat alteration and changes to river flows (Recher et al 1993). Anecdotal evidence and some early unpublished studies suggest that egeria (Egeria densa Planchon), introduced from South America as an aquarium plant, was present in the Hawkesbury-Nepean River prior to 1980. Sainty (1973) reported a persistent and troublesome infestation over a number of years at Wallacia in the upper Nepean River. Here, as part of a larger study on the ecology of macrophyte and invertebrate assemblages associated with anthropogenic disturbance in the Hawkesbury-Nepean River, we document the rapid spread of egeria since 1994. Significant increases in egeria biomass were also found, and we present preliminary evidence which suggest that the native ribbonweed, vallisneria (Vallisneria americana Michx.) is being displaced.

Item Type: Article
Title: Invasion of Egeria into the Hawkesbury-Nepean River, Australia
Personal Creator/Author:
Roberts, Daniel E.
Church, A.G.
Cummins, S.P.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 37
Page Range: pp. 31-34
Date: 1999
Latitude: -33.567
Longitude: 151.309
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: Hawkesbury-Nepean River, Australia; egeria; Egeria densa Planchon; New South Wales, Australia; Nepean River; ribbon weed; vallisneria; Vallisneria americana Michx;
Subjects: Biology
Item ID: 1743
Depositing User: Natalie Wiest
Date Deposited: 24 Nov 2008 21:24
Last Modified: 29 Sep 2011 20:09

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