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Elderslie Banksia Scrub Forest of the Sydney Basin Bioregion Ecological

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Elderslie Banksia Scrub Forest of the Sydney Basin Bioregion Ecological 1 ELDERSLIE BANKSIA SCRUB FOREST OF THE SYDNEY BASIN BIOREGION: DRAFT 2 DESCRIPTION 3 4 1. DESCRIPTION OF THE ECOLOGICAL COMMUNITY 5 Elderslie Banksia Scrub Forest of the Sydney Basin Bioregion (hereafter Elderslie Banksia 6 Scrub Forest or the ecological community) is a scrub-forest or woodland occurring on sand 7 deposits in the Camden area of south-western Sydney. The canopy is dominated by Banksia 8 integrifolia subsp. integrifolia (coast banksia). The understorey is typically shrubby with 9 scattered herbs, sedges and ferns (Tozer et al., 2010). 10 1.1 Name of the ecological community 11 The name of the ecological community is Elderslie Banksia Scrub Forest of the Sydney Basin 12 Bioregion. The ecological community was nominated and placed on the 2011 Finalised Priority 13 Assessment List as part of a broader ecological community ‘Hinterland Sand Flats Forest and 14 Woodland of the Sydney Basin Bioregion’. Elderslie Banksia Scrub Forest is one component of 15 that nomination which is being assessed separately due to its unique nature. 16 The name of the ecological community reflects its structure and location. It also aligns with a 17 listing by the New South Wales (NSW) Scientific Committee under the Threatened Species 18 Conservation Act 1995 (TSC Act) of the same name. Information regarding the NSW listed 19 ecological community can be found at: 20 http://www.environment.nsw.gov.au/determinations/ElderslieBanksiaScrubForestCommunityE 21 ndComListing.htm 22 1.2 Location and physical environment 23 The Elderslie Banksia Scrub Forest ecological community is located in the Sydney Basin 24 Bioregion as defined by version 7 of the Interim Biogeographic Regionalisation of Australia 25 (IBRA v 7). 26 It occurs almost exclusively in the Camden local government area (LGA) south of the township 27 of Camden and in proximity to the Nepean River (NSW NPWS, n.d.). The area is within the 28 jurisdiction of Greater Sydney Local Land Services. 29 Geology 30 The ecological community occurs on sandy substrates on high-level Tertiary alluvium (NSW 31 Scientific Committee, 1999; Tozer et al., 2010). 32 The soil is likely to be fairly low in nutrients, unlike more recent alluvial deposits (Keith, 33 2004), and may be well-drained or poorly drained (NSW Scientific Committee, 1999). The 34 substrate is considered to have influenced the types of plant species that occur in the ecological 35 community, many of which correspond to more coastal dune flora (Keith, 2004). 36 Altitude and Climate 37 The ecological community occurs at low elevations of around 50 m above sea level (ASL). It 38 is found on flat terrain on the valley floor in an area that receives around 750 mm rainfall 39 annually (Tozer et al., 2010). 40 1.3 Vegetation 41 The Elderslie Banksia Scrub Forest is a low woodland or scrub-forest dominated by Banksia 42 integrifolia subsp. integrifolia, approximately 10-15 m tall (Tozer et al., 2010). Wetter areas 43 may be characterised by Eucalyptus botryoides (bangalay) (NSW Scientific Committee, 1999). 44 The ecological community has a prominent and diverse mid layer which includes coastal and 45 dry rainforest flora and a patchy or scattered ground layer of ferns, sedges and herbs (Tozer et 46 al., 2010). 1 Canopy 2 The canopy is dominated by Banksia integrifolia subsp. integrifolia (coast banksia), or 3 Eucalyptus botryoides (bangalay) in some wetter areas, and may contain Angophora 4 subvelutina (rough-barked apple), E. baueriana (blue box) and/or Melaleuca decora (Tozer et 5 al., 2010; NSW Scientific Committee, 2012). 6 Mid layer (low to medium shrubs) 7 Characteristic mid layer species include: Acacia decurrens (black wattle, green wattle, Sydney 8 green wattle, Boo'kerrikin (D'harawal)), A. implexa (hickory wattle, weetjellan (D'harawal)), A. 9 ulicifolia (prickly Moses), Aotus ericoides (common aotus), Brachyloma daphnoides (daphne 10 heath), Breynia oblongifolia (coffee bush), Clerodendrum tomentosum (hairy clerodendrum), 11 Dillwynia glaberrima (smooth-leaved dillwynia), Duboisia myoporoides (corkwood), Kunzea 12 ambigua (tick bush), Persoonia linearis (narrow-leaved geebung), Pimelea linifolia subsp. 13 linifolia (slender rice-flower), Platysace lanceolata (shrubby platysace) and Ricinocarpos 14 pinifolius (wedding bush) (NSW Scientific Committee, 1999, 2012; Tozer et al., 2010). 15 Ground layer (ferns, sedges and herbs) 16 The ground layer often includes Dianella caerulea, Dianella revoluta, Gahnia clarkei (tall saw- 17 sedge), Hibbertia diffusa (wedge guinea flower), Gleichenia dicarpa (pouched coral fern, 18 tangle fern), Lomandra spp. and Pteridium esculentum (common bracken) (NSW Scientific 19 Committee, 1999, 2012; Tozer et al., 2010). 20 1.4 Fauna 21 The following fauna have been recorded within the ecological community or similar native 22 vegetation in the Camden LGA: Pygopus lepidopodus (common scaly-foot), Pogona barbata 23 (bearded dragon), Ctenotus robustus (striped skink), Lampropholis guichenoti (garden skink), 24 Pseudechis porphyriacus (red-bellied black snake), Tachyglossus aculeatus (short-beaked 25 echidna), Petaurus breviceps (sugar glider), Trichosurus vulpecula (common brushtail 26 possum), Pseudocheirus peregrines (common ringtail possum), Pteropus poliocephalus (grey- 27 headed flying-fox), Rattus fuscipes (bush rat), Limnodynastes dumerilii (eastern banjo frog), L. 28 peronii (brown-striped frog), L. tasmaniensis (spotted marsh frog), Litoria verreauxii 29 (Verreaux's tree frog) and Crinia signifera (common eastern froglet) (Jones et al., 1997). 30 Avifauna recorded within or in proximity to the ecological include Acanthiza pusilla (brown 31 thornbill), Artamus cyanopterus (dusky woodswallow), Colluricincla harmonica (grey shrike- 32 thrush), Malurus cyaneus (superb fairy-wren), M. lamberti (variegated fairy-wren), 33 Pachycephala pectoralis (golden whistler), Eopsaltria australis (eastern yellow robin), 34 Petroica rosea (rose robin), Lichenostomus chrysops (yellow-faced honeyeater), Ninox 35 novaeseelandiae (southern boobook owl), Melanodryas cucullata (hooded robin), Pardalotus 36 striatus and P. punctatus (striated and spotted pardalote), Rhipidura albiscapa (grey fantail), 37 Sericornis frontalis (white-browed scrubwren) (Jones et al., 1997). 38 The nationally threatened Lathamus discolor (swift parrot) is a migratory species that may 39 utilise the area over winter (Jones et al., 1997). 40 A number of threatened fauna are known to occur in or adjacent to the ecological community 41 (NSW Scientific Committee, 2014), these are listed at Table 1. 42 Table 1. Threatened fauna found in or near Elderslie Banksia Scrub Forest EPBC Scientific name Common name Act TSC Act Chalinolobus dwyeri large-eared pied bat v v Lathamus discolor swift parrot e e Meridolum corneovirens Cumberland land snail - e Miniopterus schreibersii oceanensis eastern bentwing bat - v Mormopterus norfolkensis eastern free-tail bat - v Pteropus poliocephalus grey-headed flying fox v v Scoteanax rueppellii greater broad-nosed bat - v 1 2 1.5 Key diagnostic characteristics and condition thresholds 3 National listing focuses legal protection on remaining patches of the ecological community that 4 are most functional, relatively natural (as described by the ‘Description’) and in relatively good 5 condition. Key diagnostic characteristics and condition thresholds assist in identifying a patch 6 of the threatened ecological community, determine when the Environment Protection and 7 Biodiversity Conservation Act 1999 (EPBC Act) is likely to apply to the ecological community 8 and to distinguish between patches of different quality. The ecological community may exhibit 9 various degrees of disturbance and degradation. This degree of degradation has been taken into 10 account in developing the condition thresholds. 11 1.5.1 Key diagnostic characteristics 12 The key diagnostic characteristics presented here summarise the main features of the ecological 13 community. These are intended to aid the identification of the ecological community, noting 14 that a broader description is given in the other sections. Key diagnostic characteristics for 15 describing the Elderslie Banksia Scrub Forest ecological community are that it: 16 Occurs solely within the Sydney Basin Bioregion. 17 Occurs on typically flat terrain near the Nepean River. 18 Occurs at low altitude around 50 m ASL 19 Occurs typically on sandy soil, on deposits of tertiary alluvium 20 The vegetation structure is typically low woodland (also described as scrub and 21 scrub/forest), less than 15 m tall with a prominent mid shrub layer. 22 The canopy is usually dominated by Banksia integrifolia subsp. integrifolia, but Eucalyptus 23 botryoides may dominate in the wettest areas. Other typical canopy species may include: 24 Angophora subvelutina, Eucalyptus baueriana and Melaleuca decora. 25 1.5.2 Condition thresholds 26 Condition classes and thresholds provide guidance for when a patch of a threatened ecological 27 community retains sufficient conservation values to be considered as a Matter of National 28 Environmental Significance, as defined under the EPBC Act. This means that the referral, 29 assessment and compliance provisions of the EPBC Act are focussed on the most valuable 30 elements of the ecological community. Very degraded patches that do not meet the condition 31 thresholds will be largely excluded from national protection. 32 Although very degraded/modified patches are not protected as the ecological community listed 33 under the EPBC Act, it is recognised that
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