Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councilsspecies (Zostera capricorni) occurring within Manly Lagoon, although a small increase in theextent of this species has been seen during the period 2004 – 2009. All Seagrass beds arelocated a minimum 500m downstream of proposed dredging works.Ecologically, seagrass beds are extremely important for the functioning of aquaticecosystems, as they provide an important habitat and source of food for many marineorganisms such as fish, crustaceans and molluscs (UTS, 2004). Seagrasses also improvewater quality by assisting in the removal of sediments and nutrients from the water bybaffling water currents, and prevent erosion by aiding in sediment stabilisation (NSWFisheries, 1999).While fragments of the kelp Ecklonia radiata are often washed in to the mouth and lowerreaches of the lagoon, no other significant foliose macroalgae have been observed withinManly Lagoon. Aggregations of filamentous brown and green algae are often seen growingon submerged debris such as leaves, tree branches and snags, but the naturally highturbidity levels within the main body of the lagoon appear to have prevented thedevelopment of significant foliose macroalgal beds.Threatened FloraA search of the National Parks and Wildlife Service (NPWS) Wildlife Atlas was undertakenon 21 July 2009, covering an area of 10km 2 surrounding the site. The search revealed thepresence of 13 species of threatened flora known to inhabit or occur within the area (recordsextend back to 1980). A similar search of the BioNet Database also undertaken on 21 July2009 identified 22 known species within the 10km 2 region, based on the NPWS and RoyalBotanic Gardens databases. Most of the species identified are terrestrial species and manyhave not been observed at the site.The search of the EPBC Database (6km 2 ) returned four flora species listed under the EPBCAct likely to occur within the area, as indicated in Table 5.6.2 July 2010 Cardno (NSW/ACT) Pty Ltd 72H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsTable 5.6: Potential Threatened Flora at Manly Lagoon (Sources: NPWS Wildlife Atlas; BioNet; EPBCDatabase)Scientific NameCommon Name2 July 2010 Cardno (NSW/ACT) Pty Ltd 73H:\Doc\2010\Reports.2010\Rep2580v4.docEPBCActTSCActRecordsSourceAcacia bynoeana Bynoe's Wattle E1 7 BioNetAcacia terminalisNPWS / BioNet /Sunshine Wattle E E1 155subsp. terminalisEPBCAllocasuarinaNielsen Park SheoakE1 9 BioNetportuensisAsterolasia buxifolia - E1 1 BioNetTessellated SpiderCaladenia tessellataVEPBCOrchidLord Howe IslandCarmichaelia exsulE1 1 BioNetBroomChamaesycepsammogetonCryptostylis hunterianaSand Spurge E1 1 NPWSLeafless TongueorchidVEPBCDendrobiummelaleucaphilumSpider orchid E1 1 BioNetDoryanthes palmeri Spear Lily V 2 BioNetEpacris purpurascensvar. purpurascens- V 1 NPWS / BioNetEucalyptus camfieldiiHeart-leavedStringybarkV 5 NPWS / BioNetEucalyptus nicholiiNarrow-leaved BlackPeppermintV 4 NPWS / BioNetGrevillea iaspiculaWee JasperGrevilleaE1 1 BioNetMacadamia tetraphyllaRough-leavedQueensland NutV 12 BioNetMicrotis angusiiAngus's OnionOrchidE1 1 NPWS / BioNetPersoonia hirsuta Hairy Geebung E1 12 NPWSPersoonia hirsutasubsp. hirsuta- E1 12 NPWSPimelea curviflora var.curviflora- V 12 NPWS / BioNetPimelea spicata Spiked Rice-flower E1 2 BioNetProstanthera askania Cut-leaf Mint-bush E1 1 BioNetProstanthera junonis Somersby Mintbush E1 2 NPWSProstanthera marifolia Seaforth Mintbush E4 14 NPWS / BioNetPultenaea parviflora - E1 1 BioNetSyzygium paniculatum Magenta Lilly Pilly V 16 BioNetTetratheca glandulosa Glandular Pink-bell V V 18NPWS / BioNet /EPBCZieria covenyi Coveny's Zieria E1 1 BioNetZieria granulata Illawarra Zieria E1 1 BioNetKEY: E1 / E2 = Endangered (TSC Act); E = Endangered (EPBC Act); E4 = Presumed Extinct (TSC Act); V =Vulnerable (TSC Act and EPBC Act).The species listed in Table 5.6 were mapped using the BioNet mapping tool (whereapplicable) and the only threatened flora species in proximity (within 1.5km) to the proposedworks site was Magenta Lilly Pilly (Syzygium paniculatum), according to the desktop study.
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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