DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report mm 50 45 40 35 30 25 20 15 10 5 0 median monthly rainfall Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec month Trangie Bourke Walgett Menindee Mungindi Moree Figure 2.7 Median monthly rainfall for weather stations across the DRP (Bureau of Meteorology 2001) days 7 6 5 4 3 2 mean monthly raindays Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec month Trangie Bourke Walgett Menindee Mungindi Moree Figure 2.8 Mean monthly rain days recorded across the DRP (Bureau of Meteorology 2001) 34
1500 1000 500 0 -500 -1000 -1500 -2000 -2500 16/08/02 Darling Riverine Plains Bioregion Background Report Long term rainfall variation Trends in available moisture resulting from the annual variation in rainfall are determined by calculating the Cusum (cumulative residual mass) curves for Menindee, Mungindi, Trangie, Walgett and Bourke. These curves (Figure 2.9) indicate that the rainfall was high throughout the 1880s and 1890s but there was a steady decrease from about 1900 until 1948 with a resultant moisture deficit throughout the bioregion. The severity and timing of this deficit varied between the five locations. Since about 1950, the moisture availability generally shows an upward trend although this was delayed until 1974 at Menindee and was not sustained at Trangie from 1960 to 1974. Cummulative Sums for Rainfall Menindee Mungindi Trangie Walgett Bourke Figure 2.9 Rainfall CuSums for five locations in the DRP The rainfall within the DRP does not have a regular annual cycle and plant growth and animal breeding patterns will be controlled by this long term pattern. This will influence the recovery rates of particular habitats and populations, with the current upward trend in the rainfall suggesting that conditions are favourable for potential re-establishment and recovery of populations. This may help explain the increased growth of the unpalatable native shrubs or ‘woody weeds’ in parts of the bioregion. 35
Page 1 and 2: DARLING RIVERINE PLAINS BIOREGION B
Page 3 and 4: For more information data contact t
Page 5 and 6: 3.2 Vegetation Mapping and Descript
Page 7 and 8: 10 APPENDICES 166 A CLIMATIC DATA B
Page 9 and 10: List of Maps Chapter 1 Map 1 Locati
Page 11 and 12: PROJECT SUMMARY This report forms p
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Initial Phase Assessment Phase 16/0
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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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