14016: Revegetation of the islands at Mary Carroll Lake

    Mary Carroll Park is a seasonal wetland on the Swan Coastal Plain. It is heavily impacted as a result of past and present land uses, and it it is widely recognised for its biodiversity value. This is reflected in the site being recognised as both a Conservation Category Wetland and a Bush Forever Site.

    Revegetation work is carried out at the site by the Friends of Mary Carroll Wetland and the City of Gosnells. Previous State NRM Program funding has allowed revegetation works to focus on the islands which form important habitat. The project has seen the installation of over 8000 local native seedlings (with another 4000 to be planted over winter 2014), chemical and manual weed control, and the construction of a fence along a portion of the lake to limit illegal vehicle access. The results of this project to date have been excellent, with planted areas establishing very well.

    Revegetation of the islands at Mary Carroll Lake aims to consolidate the good work achieved by the earlier grant. This project will continue revegetation efforts on the original five islands and include an additional two islands as well as the Causeway area and any other general infill required. Chemical weed control will be carried out by a certified contractor across the whole site, with the City of Gosnells contributing half of the funding to the work. Manual weed control is carried out continuously by the Friends of Mary Carroll Wetlands.

    A key threatening process to the site is weed invasion. Areas of good condition vegetation are at risk from weed invasion from highly degraded and weed infested areas of the lake and surrounding properties. This process had led to a domination of weed species throughout the Park, with resulting declines in native fauna and flora diversity. However with past restoration works, we have established a thriving ecosystem and anecdotal evidence shows increases in bird life particularly.

    Mary Carroll Park is recognised as a regionally important habitat for birds with over 39 water bird species and 44 species of song birds using the lakes for feeding and/or breeding each year. Invasive pest species such as foxes are a threat to these species and the other native fauna that live at Mary Carroll Lake. Fox control is undertaken at the Park by the City of Gosnells as part of a coordinated fox control program. Similar issues occur with cats, so this island project in particular is a useful strategy for establishing sanctuaries against feral predation.

    Illegal use of vehicles on the lake and dumping of rubbish are ongoing issues for the site. Fencing has been successful in greatly reducing the impact of vehicles, and dumping of rubbish is regularly reported by the Friends of Mary Carroll Lake, who also conduct rubbish collection during weekly work days.

    This project will continue with weed removal and planting (including infill) works into the island and causeway areas as well as some identified degraded areas on the lake's periphery. The following works will be conducted:

    • 4000 local native seedlings will be planted during winter 2015 by FMCW and local school groups.
    • Invasive herbaceous weed control throughout year - chemical and manual.

    Woody weed will be removed throughout year.  As space opens up, these areas will be in-filled with native plantings.

    Investment: $ 11 000
    In-kind contribution: $ 17 100
    Delivery organisation: Friends of Mary Carroll Wetland
    Project duration: January 2015 - June 2016
    Location: Gosnells; Perth region

    Project partners

    City of Gosnells, Gosnells Primary School, Armadale-Gosnells Landcare Group

    More information

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