DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report Family Plant species Legal Status 1 Fabaceae (Mimosoideae) Acacia notabilis E1 Sapindaceae Dodonaea microzyga var. microzyga E1 Asteraceae Leptorhynchos waitzia E1 Poaceae Austrostipa wakoolica *E1 Asteraceae Senecio behrianum E4 Euphorbiaceae Bertya sp. A (Cobar-Coolabah) *V Brassicaceae Lepidium aschersonii *V Aizoaceae Glinus orygioides 3K 1 Status codes as for Table 4.2 4.2.3 Extinct species and historical records Four species now regarded as extinct in NSW (TSC Act) have been recorded from the DRP (Table 4.4). Table 4.4 Extinct plant species in New South Wales previously recorded from the DRP Family Scientific name Legal status 1 Number of records Dataset 2 Last date recorded Asteraceae Acanthocladium dockeri *E4 1 WLA 1788 Proteaceae Grevillea nematophylla E4 2 WLA (1), RBG (1) 1788 Chenopodiaceae Maireana lanosa E4 1 WLA 1800 Brassicaceae Stenopetalum velutinum E4 2 WLA (1), RBG (1) 1903 1 - Legal status codes as for Table 4.2 2 - Database sources as for Table 4.2 An additional ten listed plant species are only known from historical (pre-1970) records (Table 4.5). The current status of these species in the DRP is unknown and it is possible some may be regionally extinct. Table 4.5 Plant species of conservation concern known historically from the DRP but with no recent records Family Scientific name Legal status 1 Number of records Last date recorded Adiantaceae Cheilanthes sieberi ssp. E1 pseudovellea 2 RBG (1), NH (1) 1952 Chenopodiaceae Atriplex infrequens *V (2V) 4 WLA (1), RBG (1), NH (2) 1861 Myrtaceae Thryptomene hexandra 3RC- 2 RBG 1913 Rutaceae Zieria granulata *E1 1 RBG 1899 Fabaceae (Faboideae) Indigofera efoliata *E (2E) 1 NH 1955 Fabaceae (Faboideae) Swainsona murrayana *V (3VCi) 10 WLA (3), RBG (3), NH (4) 1955 Fabaceae Swainsona recta *E1 5 WLA (1), RBG (2), NH (2) 1911 (Faboideae) (3ECi) Eriocaulaceae Eriocaulon carsonii *E1 (3E) 2 RBG (1), NH (1) 1888 Cyperaceae Cyperus conicus E1 2 RBG (1), NH (1) 1968 Poaceae Dichanthium setosum *V 2 WLA (1), NH (1) 1892 1 - Legal status codes as for Table 4.2 2 - Database sources as for Table 4.2 Dataset 2 90
16/08/02 Darling Riverine Plains Bioregion Background Report 4.2.4 Regionally endemic species and significant populations There are no listed threatened populations of these species on the TSC Act 1995 and there has been no assessment of declining populations or regionally threatened populations. Regionally threatened populations are to be included in Regional Vegetation Management Plans and other management strategies. There has been no evaluation of regionally endemic species within the DRP. 4.3 WEED AND INTRODUCED SPECIES There are many introduced plant species in the DRP and these are often in high densities. A total of 229 exotic species have been recorded (Appendix D). Some native species also respond very favourably to change in environmental conditions, including disturbance, and become agricultural weeds. The abundance of both native and weed species will vary from season to season depending on rainfall. Some of the most abundant ‘weeds’ include: blackberry Rubus fruticosus species complex prickly pear Opuntia stricta Paterson’s curse Echium plantagineum African boxthorn Lycium ferocissimum lippia Phyla canescens *galvanised burr Sclerolaena birchii variegated thistle Silybum marianum mimosa bush Acacia farnesiana water hyacinth Eichhornia crassipes tiger pear Opuntia aurantiaca * = native species which are not endemic to the DRP 4.4 SUMMARY AND PROPOSED FURTHER WORK 4.4.1 Summary Floristic surveys of the DRP have been very patchy with large areas having never been systematically surveyed, especially in the western half of the bioregion. The lower portion of the Darling River (south from Bourke to just north of Menindee) has few records in the NPWS Wildlife Atlas (Map 26), with most 1:100 000 scale mapsheets having only one to ten records. This area should be a priority for flora survey. The most detailed systematic floristic surveys have been conducted in the eastern and northern portions of the bioregion, such as the northern floodplains (Dick 1993), Moree (Hunter 1999) and the wheatbelt (Sivertsen & Metcalfe 1995). Thirty-one species of conservation concern (TSC Act, EBPC Act, ROTAP) have been recorded from the DRP, another ten are predicted to occur in the bioregion, four are considered extinct and ten have not been recorded since 1970. Very little is known about the distribution and abundance of these species or the processes threatening their survival. Targeted searches for these species are needed if they are to be managed effectively and if recovery plans are to be prepared. No threatened plant species listed under the TSC Act 91
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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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ainfall (mm) 900 800 700 600 500 40
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1500 1000 500 0 -500 -1000 -1500 -2
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Appendix A: Mean Monthly Rainfall a
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80 70 60 50 40 30 20 10 0 25 20 15
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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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DARLING RIVERINE PLAINS BIOREGION Background Report

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