DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report Understorey species include: Aristida contorta Atriplex spp. Atriplex angulata Atriplex holocarpa Atriplex stipitata Brachyscome spp. Dissocarpus paradoxus Dodonaea viscosa Enchylaena tomentosa Enneapogon avenaceus Eremophila maculata Eremophila sturtii Grevillea huegelii Haloragis glauca forma glauca Ixiolaena tomentosa Lotus cruentus Lycium australe Maireana georgei Maireana pyramidata Maireana sclerolaenoides Maireana sedifolia Myoporum deserti Pimelea microcephala Plantago drummondii Ptilotus atriplicifolius Pycnosorus pleiocephalus Rhodanthe floribunda Sauropus trachyspermus Sida fibulifera Sclerolaena spp. Sclerolaena divaricata Sclerolaena obliquicuspis Sclerolaena patenticuspis Senna artemisioides Austrostipa spp. Swainsona formosa Templetonia egena Tetragonia tetragonioides Teucrium racemosum Zygophyllum simile 3.4.3 Artesian springs ecological community The artesian springs ecological community is listed as an endangered ecological community under the TSC Act. This community is restricted in New South Wales to artesian springs at the southern and western margins of the Great Artesian Basin (GAB) in the north-west of the state, in the Mulga Lands, DRP and Cobar Peneplain bioregions. The Artesian Springs Ecological Community varies between springs, as they differ in shape, water flow, topographic position and geographic location (NPWS 2001a). Typical plant species may include: Abutilon otocarpum Acacia victoriae Alternanthera denticulata Alternanthera angustifolia Atriplex spp. Boerhavia coccinea Calandrinia ptychosperma Centipeda minima Centipeda thespidioides Chamaesyce drummondii Chenopodium cristatum Chenopodium melanocarpum Chloris pectinata Cyperus bulbosus Cyperus iria Cyperus laevigatus Cyperus squarrosus Dactyloctenium radulans Diplachne fusca Dodonaea viscosa subsp. angustissima Einadia nutans subsp. nutans Eragrostis spp. Eremophila deserti Eucalyptus largiflorens Geijera parviflora Marsilea spp. Oxalis spp. Portulaca oleracea Sclerostegia spp. Sporobolus caroli Stemodia florulenta Trianthema triquetra Eremophila sturtii Eucalyptus populnea subsp. bimbil 82
16/08/02 Darling Riverine Plains Bioregion Background Report Glinus lotoides Myoporum montanum Pimelea microcephala subsp. microcephala Sclerolaena spp. Solanum esuriale Sporobolus mitchellii Swainsona spp. Mounds of salt and sediment resulting from the evaporation of artesian water as it emerges through rock, are the features on which this community depends. The community often supports unique aquatic invertebrate and vertebrate fauna, including freshwater snail and fish species that may occur at one spring only. Threats include trampling and grazing by stock and feral animals, and the alteration of flow or unsustainable extraction of artesian water leading to reduce flows at mound springs. Some mound springs have dried in the past 100 years, probably causing the extinction of undescribed aquatic invertebrates (NPWS 2001a). 3.4.4 The community of native species dependent on natural discharge of groundwater from the Great Artesian Basin. The community of native species dependent on natural discharge of groundwater from the Great Artesian Basin is listed as a threatened ecological community on the EPBC Act. This community includes natural surface discharge points within the GAB discharge area of aquifers in the Triassic, Jurassic and Cretaceous sedimentary sequence. The native species in this community depend on the discharge of groundwater for their existence and include some wide-ranging species as well as locally endemic species (restricted to one or more GAB spring). Examples of these species include: Jardinella sp. (endemic snail) Utricularia sp. (aquatic forb) Cyperus laevigatus (flora) Eucalyptus camaldulensis (flora) Myoporum desertii (flora) Chlamydogobius sp. (fish) Schoenoplectus pungens (flora) Cyperus gymnocaulos (flora) Eriocaulon carsonii (aquatic herb – endemic to mound springs of Peery Lake) Heliotropium curassavicum (flora) Sclerostegia sp. (flora) This community has become threatened through excessive extraction of groundwater from the GAB, leading to the extinction of some springs and a reduction in flow at remaining springs. Other threats include grazing and trampling by livestock and feral animals, mechanical modification such as dam construction and the introduction of exotic pasture species (Environment Australia 2001b). 3.4.5 Acacia harpophylla (brigalow dominant or co-dominant) The Acacia harpophylla community is listed as threatened under the EPBC Act and a preliminary determination has been made to list this community as an endangered ecological community under the TSC Act. It has suffered a severe decline in extent since clearance of land for agriculture. Less than 10% of its original extent remains (Environment Australia 2001a). Within NSW there are several species associations. These are Acacia harpophylla with Casuarina cristata (belah) and Geijera parviflora (wilga) or yellow wood, with wilga, with vine thickets of ooline or mixed species or softwoods, with Eucalyptus populnea subsp. bimbil (bimble box) and Eucalyptus pilligaensis (Pilliga box), with Eucalyptus coolabah (coolibah), with gidgee and other acacias and occur as regenerated brigalow (Pulsford 1984). 83
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DARLING RIVERINE PLAINS BIOREGION B
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For more information data contact t
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3.2 Vegetation Mapping and Descript
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10 APPENDICES 166 A CLIMATIC DATA B
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List of Maps Chapter 1 Map 1 Locati
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PROJECT SUMMARY This report forms p
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abbits are listed as key threatenin
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16/08/02 Darling Riverine Plains Bi
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Initial Phase Assessment Phase 16/0
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Appendix A: Mean Monthly Rainfall a
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Major Rangetype Rangetype Physiogra
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Appendix C : Native Flora Other Tha
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Family Scientific Name Common Name
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Family Scientific Name cretica Comm
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APPENDIX E: Fauna Other than Those
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Common Name Scientific Name No Reco
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Common 1983 1984 1985 1986 1987 198
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Common Name 1983 1984 1985 1986 198
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Taxa No Records Dataset Class Arach
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Taxa No Records Dataset Family Hebr
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Taxa No Records Dataset Tabanidae s
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Taxa No Records Dataset Berosus sp
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