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Appendix 4 Riparian Vegetation Communities and Flora Species Recorded During Field Investigation

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APPENDIX 4 RIPARIAN VEGETATION COMMUNITIES AND FLORA SPECIES RECORDED DURING FIELD INVESTIGATION Table 8.14 Riparian Vegetation communities located within the study area, description, threats and conservation status (Source: DECCW 2009) Vegetation Community Description Threats Values Beach Spinifex This vegetation community is composed of an open cover of - Intense recreational pressures in the Grassland grass and herbs. It fringes the sandy beaches of the coastline Sydney area, including sand removal, and sandy inlets and is often temporary in nature due to growing trampling and rubbish aggregation on mobile sand deposits including beach foredunes and dune - This community is rarely retained on blowouts. Dominant species include the grass, Hairy Spinifex heavily used beaches and or modified (Spinifex sericeus ) and succulent herb such as Pigface dunal landscapes (Carpobrotus glaucescens ). The species in this community are - Found in all coastal national well adapted to disturbance and their stout rhizomes stabilise the parks and reserves sand against wind and storm erosion. Location within study area (see Figures 8.6a – 8.6g) This vegetation community is found in association with Coastal Foredune Wattle Scrub. It is distributed within the study area from Carters Island to near the mouth of the Cooks River. It is located within Towra Point Nature Reserve. - Representative Endangered Castlereagh Ironbark This vegetation community has a varied structure, ranging from a - Clearing in the past, including for Ecological Community (EEC): Forest moderately tall open eucalypt forest or woodland to a low dense urban development Cooks River/Castlereagh thicket of paperbarks with low emergent eucalypts. The most - Weed invasion, rubbish dumping, Ironbark Forest commonly recorded eucalypt is Broad-leaved Ironbark inappropriate mowing and high - Remnants are small isolated (Eucalyptus fibrosa ), with a regular associate with this frequency fires patches surrounded by urban community being Woollybutt ( Eucalyptus longifolia ). However areas sites are often comprised of a diverse canopy due to the subtle grades between substrates. The small tree layer includes Melaleuca decora , with a dense shrub cover below, including Melaleuca nodosa , Blackthorn ( Bursaria spinos a) and Peach Heath ( Lissanthe strigosa ). The ground cover includes a sparse layer of grasses and herbs, which can be minimal where dense shrub layers reduce light penetration. Location within study area (see Figures 8.6a – 8.6g) This vegetation community is distributed upstream of Salt Pan Vegetation Community Description Threats Values Creek. - On the Cumberland Plain the Castlereagh Scribbly Found on poorly consolidated sand deposits on hinterland plains - Clearing for urban development and Voyager Point and Holsworthy Gum Woodland and valleys of the Sydney Basin region. In the Sydney sand mining, resulting in disjunct and area represent one of two Metropolitan Catchment Management Authority (SMCMA) area it isolated remnants large remnants remaining occurs on old stream deposits including at Holsworthy and - Current threats: - Naturally rare Voyager Point. Frequent fire - In the SMCMA area it is not Illegal trail riding The woodland structure is open, with low growing eucalypts represented in the formal Rubbish dumping dominated by Hard-leaved Scribbly gum ( Eucalyptus reserve system Weed invasion sclerophylla ), Narrow-leaved Apple ( Angophora bakeri ) and - Recreational and associated urban Drooping Red Gum (Eucalyptus parramattensis subsp. pressures currently due to being parramattensis ). Often there is a sparse cover of Tall Paperbark surrounded by urban development (Melaleuca decora). The shrub layer is well developed and composed of banksias, hakeas, wattles, tea trees and paperbarks with a diverse groundcover underneath, typically with good cover provided by grasses and sedges. Location within study area (see Figures 8.6a – 8.6g) Williams Creek and along Georges River downstream of Kelso Creek - Representative EEC: Shale Castlereagh Shale- The low soil fertility and relatively low mean annual rainfall have - Clearing in the past, including for Gravel Transition Forest in the Gravel Transition Forest resulted in a community that is an open eucalypt forest with a urban development Sydney Basin Bioregion variable understorey, ranging from dense shrubs to a low sparse - Weed invasion, rubbish dumping, - Remnants are small isolated shrub cover with an abundant ground layer of grasses. The inappropriate mowing and high patches surrounded by urban dominant eucalypt species is Broad-leaved Ironbark ( Eucalyptus frequency fires areas fibrosa ), accompanied by a variety of other eucalypts influenced by the location of the community. The small tree layer is composed of Melaleuca decora with a shrub layer underneath including Blackthorn ( Bursaria spinosa ) and Gorse Bitter Pea (Daviesia ulicifolia ). The ground layer includes a mix of grasses, sedges and herbs. Location within study area (see Figures 8.6a – 8.6g) This vegetation community is distributed on the southern side of Williams Creek near the confluence with the Georges River and at Voyager Point. - Representative EEC: River Coastal Alluvial - Coastal development This community is found on low-lying alluvial deposits associated Flat Eucalypt Forest on Vegetation Community Description Threats Values Bangalay Forest with stream banks and inlets along the coastal zone, formed by - Predicted sea level r ise arising from Coastal Floodplains sandy loams washed down from eroding sandstone ridges and climate change (long-term) gullies above. It occurs on elevations less than 15 metres above - Water pollution, alterations to drainage sea level and where rainfall exceeds 1200mm per annum. The and water flow patterns and frequent sclerophyll forest is most often dominated by a single species, fire. Bangalay ( Eucalyptus botryoides ). A sparse lower layer of - Invasive weeds including Lantana casuarinas is usually present with Swamp Oak found adjacent to (Lantana camara ) the water and Forest Oak ( Allocasuarina torulosa ) on drier, elevated parts of the flat. The understorey is generally open with conspicuous isolated trees or clumps of Cabbage Tree Palm (Livistona australis ) found alongside a number of other mesic species and paperbarks. The ground layer is characterized by a high cover of ferns amongst a diverse range of grasses, herbs and sedges. Location within study area (see Figures 8.6a – 8.6g) This vegetation community is located in Carina Bay. - Representative EEC: Littoral Coastal Dune Littoral This vegetation community, found on recent sand deposits, - Invasive weeds including Lantana Rainforest Rainforest forms a low closed canopy of rainforest trees dominated by (Lantana camara ) and Bitou Bush - The small isolated remnants Tuckeroo (Cupaniopsis anacardioides ). Occasionally there is an (Chrysanthemoides monilifera subsp. of this community remaining emergent eucalypt, casuarinas, banksias or paperbark. monilifera ) are prolific in disturbed in the SMCMA occur on the Rainforest tree species also include Lilly Pilly ( Acmena smithii ) areas that adjoin remnants Kurnell Peninsula. This and Cheese Tree ( Glochidion ferdinandi ). The small tree layer in includes areas within the the Sydney region includes the threatened species the Magenta study area at Towra Point Lilly Pilly ( Syzygium paniculatum ). Nature Reserve. These Location within study area (see Figures 8.6a – 8.6g) remnants are threatened by This vegetation community is found with Towra Point Nature encroaching lantana. Reserve. Coastal Enriched This tall open forest has a distinctive mesic shrub and small tree - Weed infestation, in particular from - In the region the SMCMA Sandstone Moist Forest layer. The dominate species in the canopy varies with different lantana ( Lantana camara ) encompasses the majority of combination of eucalypt species, usually with Smooth-barked - Frequent fire may present localised this communities distribution Apple ( Angophora costata ). Under this canopy layer there is impacts - Found in Lane Cove, Royal often a tall stand of forest oak ( Allocasuarina torulosa ) with taller - Impacts due to clearing are minimal and Sydney Harbour National small trees below composed predominantly of rainforest species due to the unsuitable nature of the Parks such as Coachwood ( Ceratopetalum apetalum ), Blueberry Ash environment, where this community is (Elaeocarpus reticulatus ) and occasionally Cabbage Palms found, for urban development or (Livistona australis ). The ground layer varies from a sparse to agriculture Vegetation Community Description Threats Values dense cover of ferns and twiners. Location within study area (see Figures 8.6a – 8.6g) This vegetation community has a limited distribution throughout the study area, found from Salt Pan Creek downstream to Shipwrights Bay Reserve. This patchy distribution is similar to its distribution within the SMCMA, where it is found in sandstone gullies and sheltered slopes enriched by clay material (DECCW 2009a), Coastal Enriched This vegetation community is most commonly found along steep - Clearing for urban development (low Sandstone Sheltered sheltered slopes, however it does also occur at a variety of threat where community occurs in Forest topographic locations. This tall open eucalypt forest has an rugged infertile environments) understorey of dry sclerophyll shrubs with ferns and forbs - Localised weed infestation occurs in amongst the ground cover. The common eucalypts are
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