DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report Key area 5: In the Castlereagh-Barwon province near Thalaba Creek to the north west of Narrabri. The area consists of prior stream deposits and high-level floodplains of the upper alluvial fans (330 km 2 ); Corridor: A corridor along Thalaba Creek, mainly following the stock route along the Millie-Merrywinebone Road, connecting key areas 4 and 5; Key area 6: An extension from the Narran Lakes area south to the Barwon River to sample the broad and complex flood plain of the Barwon in the Castlereagh-Barwon province (300km 2 ); Key area 7: Based on the discontinuous band of State Forests on a low red rise in the south of the Castlereagh-Barwon province. Tallegar and Sandgate State Forests are the largest and least disturbed remnants and form part of a proposed corridor linking Warrie State Forest in the south-east to Narraway State Forest in the north-west (40 km 2 ); Key area 8: Includes the major land systems within the Culgoa-Bokhara province, and connects with proposed key area 11 for the Narran Lakes area (160 km 2 ); Key area 9: Contains land systems typical of the northern part of the Warrambool-Moonie province, and adjoins proposed key area 13 in the Collarenebri Interfluve province (140 km 2 ); Key area 10: Adjoins the large Narran Lakes key area, and is representative of the southern part of the Warrambool-Moonie province (410 km 2 ); Key area 11: A large and complex area within the Narran-Lightning Ridge province, including Narran Lake Nature Reserve. This would expand the Nature Reserve to include adjoining land systems and connect to key areas in adjacent provinces (1 380 km 2 ); Key area 12: In the northern section of the Narran-Lightning Ridge province and containing a wetland and sandstone ridge (150 km 2 ); Key area 13: The largest remaining example of intact natural vegetation in the Collarenebri Interfluve province, which is a restricted land unit in New South Wales (250 km 2 ); Key area 14: Spans the Darling flood plain and contains representative examples of all provincial land systems in the Louth Plains province (550 km 2 ); Key area 15: Spans the Darling flood plain and contains most of the land systems of the Wilcannia Plains province (330 km 2 ); Key area 23: Extends over the Culgoa River to include river fringing and flood plain communities typical of the Culgoa-Bokhara province, and areas of the Warrego fan natural region (360 km 2 ); Key area 40: Mostly located within the Darling Depression natural region, but contains areas representative of the overflow basins of the Wilcannia Plains province (240 km 2 ); Key area 55: Straddles the border of the Castlereagh-Barwon province and the northern sandstones natural region (mainly in the latter), and contains areas of grey clay communities (160 km 2 ); Key area 61: Extends from the Pilliga outwash natural region north west to the Namoi River, which is at the edge of the Castlereagh-Barwon province (220 km 2 ); Key area 90: Mostly located within the Cobar Peneplain natural region, but extends into the Louth Plains province on ancestral alluvials (790 km 2 ). 8.4.2 Refugia Refugia are defined by EPA (2000) as ‘areas which have escaped the great changes undergone by a region as a whole, providing conditions in which relic communities of plants and animals can survive’. The DRP contains three of the nationally significant biological refugia listed in Morton et al. (1995) for arid and semi-arid Australia. They are the Macquarie Marshes, Narran Lakes and the Darling and Talyawalka Anabranch Lakes (Figure 8.2). Morton et al. (1995) also identified the Paroo wetlands, most of which are located in the 146
16/08/02 Darling Riverine Plains Bioregion Background Report adjoining Mulga Lands bioregion, as a nationally significant biological refugium. This analysis does not include the north eastern corner of the DRP which may contain significant refugia and requires analysis. The Macquarie Marshes provide drought refuge when other wetlands, especially inland wetlands, are dry. They provide habitat for a diverse reptile fauna that are aquatic or are strongly associated with water. Narran wetlands also provide important drought refuge for waterbirds when other inland wetlands are dry and support large nesting colonies of strawnecked ibis Threskiornis spinicollis and large concentrations of ducks when water levels recede. The third refuge area, the Talyawalka Anabranch of the Darling River and its distributary Teryawynia Creek, between Wilcannia and Menindee has large areas of Eucalyptus largiflorens (black box) and when inundated provides habitat for large numbers of waterbirds. Figure 8.2. Nationally significant biological refugia within the DRP (Morton et al. 1995) 8.4.3 Centres of endemism The springs of the Great Artesian Basin contain unique and endemic biota and represent the only known centre of endemism within the DRP. This is discussed in Section 3.4. The fluvial landscape of the DRP has generally subtle biophysical changes with few unique and restricted 147
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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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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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