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Ord Victoria Plain Bioregion

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Ord Victoria Plain Bioregion Ord Victoria Plain bioregion Description Figure 2 Western Australian Rangeland Monitoring System (WA) and Area: 125 410 km2 Tier 1 (NT) monitoring sites The Ord Victoria Plain bioregion is found in northern shown on the pastoral tenure Western Australia (WA) and the Northern Territory of both jurisdictions (NT) and includes ridges, plateaus and undulating plains, with scattered mesas and buttes. Vegetation bioregion boundary NT pastoral tenure comprises mainly eucalypt woodlands over spinifex WARMS monitoring site and annual grasslands. Extensive cattle grazing is the Tier 1 monitoring site main industry. Other land uses include Aboriginal land, nature reserves and tourism. Major population centres are Kalkarinji, Daguragu and Yarralin. WA Location The Ord Victoria Plain bioregion is located in northern WA (44% of bioregion area) and the NT (56% of WARMS (WA) and Tier 1 (NT) monitoring sites shown on the pastoral tenure of both jurisdictions area; see Figures 1 and 2). Data sources available Figure 1 Location of the Ord Victoria Data sources include: Plain bioregion n Western Australian Rangeland Monitoring System (WARMS), which provides moderate reliability for reporting change, with a moderate number of reasonably well-distributed sites, quantitative data, and a focus on perennial plant species (which helps to filter short-term seasonal variability) n NT Tier 1, which provides moderate reliability, with a large number of reasonably well-distributed sites, estimated data, and a focus on perennial pasture species n domestic stocking density, which provides moderate reliability n fire extent, intensity and frequency, which provides high reliability Location of Ord Victoria Plain bioregion n dust n distance from water Ord Victoria Plain bioregion 1 n distribution and relative abundance of invasive Number No animals and weeds of site- change: by-year Decline: 0.90 ≤ Increase: n land use Seasonal combi- frequency frequency frequency n conservation estate quality nations < 0.90 < 1.10 ≥ 1.10 Above n land values. average 186 7% 66% 27% Average 29 17% 52% 31% Climate Below average 16 19% 56% 25% The Ord Victoria Plain bioregion is semiarid with a dry, warm monsoonal climate. Spatially averaged Northern Territory median (1890–2005) rainfall is 504 mm (April to March rainfall year; see Figure 3). Tier 1, index based on composition (by biomass) and cover of perennial herbage species Figure 3 Decile rainfall for the period 1991–1992 to 2004–2005 When seasonal quality was above average, 12% of sites showed a decline in the index of landscape 10 9 function. It is not possible to report change following 8 7 below-average seasonal quality. 6 median 5 Percentage of reassessed 4 sites showing: 3 Number Rainfall decile 2 of site- Decline: Increase: 1 by-year > 3 de- > 3 in- 0 1991-92 1993-94 1995-96 1997-98 1999-00 2001-02 2003-04 Seasonal combi- crease in No crease in quality nations index change index Rainfall year Above Annual rainfall is for the 12‑month period 1 April average 154 12% 66% 22% to 31 March. Average 70 0% 81% 19% Below Seasonal quality based on decile rainfall was generally average 5 n/a n/a n/a above average. It improved from a particularly poor year in 1991–1992 to experience some of the wettest years since records began (10 of the 14 years had Sustainable management decile rainfall ≥ 7). Note that regional averaging of rainfall conceals spatial Critical stock forage variability. Some parts of the Ord Victoria Plain Western Australia bioregion may have experienced better seasonal quality and others worse during the 1992–2005 period. WARMS, frequency of decreaser perennial grass species Landscape function When seasonal quality was above average, 26% of sites showed a decline in the frequency of decreaser Western Australia perennial grass species, while 38% of sites showed an increase when seasonal quality was below average. WARMS, perennial grass frequency When seasonal quality was above average, 7% of sites showed a decline in perennial grass frequency, while 25% of sites showed an increase when seasonal quality was below average. 2 Rangelands 2008 — Taking the Pulse No Number change: 1.10 1.10 0.90 of site- Decline: 0.80 ≤ Increase: by-year richness richness richness Seasonal combi- index index < index quality nations < 0.80 1.20 ≥ 1.20 Seasonal Species frequency < Above quality group Number of site-by- year combinations Decline: frequency < No change:0.90 ≤ Increase: frequency ≥ average 187 12% 55% 33% Above Decreaser 178 26% 44% 30% Average 29 14% 48% 38% average Intermediate 96 27% 15% 57% Below Increaser 116 48% 15% 37% average 16 13% 50% 38% Average Decreaser 28 18% 43% 39% Intermediate 12 75% 8% 17% Increaser n/a n/a n/a n/a Change in woody cover Below Decreaser 16 25% 38% 38% Western Australia average Intermediate n/a n/a n/a n/a Increaser 14 36% 36% 29% Crown cover of woody species increased by 18% on average, and remained the same or increased on 62% Northern Territory of WARMS sites. On 10% of sites, cover dropped below 50% of the initially recorded value. Tier 1, composition (by biomass) of palatable perennial herbage species Northern Territory When seasonal quality was above average, 15% of There is negligible forest cover in the NT part of the sites showed a decline in the composition of palatable Ord Victoria Plain bioregion based on the Australian perennial (2P) herbage species. It is not possible to Greenhouse Office definition and mapping of forest report change following below-average seasonal quality. extent (approximately 0.8% of NT bioregion area in 1991 and 2004).1 There was only partial coverage of Percentage of reassessed Landsat data before 1991 (approximately 33% sites showing: of bioregion was covered, with complete coverage Number Decline: Increase: in 2004). of site- > 20% > 20% by-year decrease increase Seasonal combi- in 2P No in 2P Distance from stock water quality nations grasses change grasses The percentage of sub-Interim Biogeographic Above Regionalisation for Australia (IBRA) average 171 15% 57% 28% area within three kilometres of permanent and semipermanent Average 75 11% 69% 20% sources of stock water is summarised in the following Below average 5 n/a n/a n/a table. Note that for WA, the locations of stock waterpoints were sourced from state mapping of lease infrastructure, and watered area is reported as the Plant species richness percentage of pastoral tenure within each sub-IBRA. Plant species richness data relate to the WA part of Data for the NT were obtained from Geoscience the bioregion only. When seasonal quality was above Australia’s GEODATA TOPO 250K vector product average, 12% of WARMS sites showed a decline in (Series 3, June 2006), and watered area is the species richness of native perennial plants, while 38% percentage of sub-IBRA area. These differences of sites showed an increase when seasonal quality mean that the percentage watered area reported was below average. by each data type is not directly comparable. 1 See http://www.greenhouse.gov.au/ncas/reports/tech09.html Ord Victoria Plain bioregion 3 Western Northern Components of total Australia Territory grazing pressure % sub- % sub- IBRA % sub- IBRA % sub- within IBRA within IBRA Domestic stocking density 3 km of area 3 km of area The data for domestic stocking density report for Sub-IBRA water analysed water analysed pastoral tenure of both WA and the NT. Approximately Ord Victoria Plain P1 (OVP1) 13.3 74.9 5.4 100 82% of the Ord Victoria Plain bioregion area is grazed. South Kimber- Data from the Australian Bureau of Statistics showed ley Interzone that domestic stocking density remained between (OVP2) 17.5 97.6 14.5 100 84 and 96% of the 1983–1991 average throughout Ord Victoria (ie 1992–2004). The highest stocking density occurred Plain P3 (OVP3) 2.6 100 between 2000 and 2002 (approximately 95% of the Ord Victoria 1983–1991 baseline). This period of more moderate Plain P4 (OVP4) 15.6 100 stocking occurred during above-average seasonal quality IBRA = Interim Biogeographic Regionalisation for Australia; (see Figure 3, above), probably as part of improving OVP = Ord Victoria Plain herd quality to meet live export requirements. Note that this analysis does not include the locations Improved herd control under the national Brucellosis of natural waters, which in this bioregion can provide and Tuberculosis Eradication Campaign probably additional sources of water for stock, particularly contributed to destocking in the early part of the in the early dry season. It is not possible to report 1992–2005 reporting period. Additionally, approximately change in watered area for the 1992–2005 period 25% of pastoral leases in the WA part of the bioregion for either jurisdiction. are under Indigenous ownership and many are either destocked, or running low numbers of cattle. Mistake Weeds Creek is the largest Aboriginal-owned pastoral lease in the NT part of the bioregion and in the past 10 Weeds known to occur in the Ord Victoria Plain years has invested heavily in infrastructure development bioregion include: and continuing to build herd numbers. Common name Scientific name Note that spatial averaging conceals likely variation Parkinsonia Parkinsonia aculeata in stocking density trends across the bioregion. Calotrope Calotropis procera Sida spp. Sida spp. Kangaroos Hyptis Hyptis suaveolens There are no suitable data for reporting change Sicklepod Senna obtusifolia in kangaroo populations. Noogoora burr Xanthium occidentale Bellyache bush Jatropha gossypifolia Mesquite Prosopis spp. Chinee apple Ziziyphus mauritiana Salvinia molesta Salvinia molesta Grader grass Themeda quadrivalvis Athel pine Tamarix aphylla Prickly acacia Acacia nilotica subsp. indica Rubber vine Cryptostegia grandiflora Mission grass Pennisetum polystachion See www.anra.gov.au for distribution maps 4 Rangelands 2008 — Taking the Pulse Invasive animals Biodiversity Invasive animal species known to occur in the A case study (see Habitat condition affects biodiversity Ord Victoria Plain bioregion include: in Chapter 3) has looked at how habitat condition affects biodiversity (Biodiversity Working Group Common name Scientific name indicator: Habitat condition; see Section 7 of Feral pig Sus scrofa Chapter 3 of Rangelands 2008 — Taking the Pulse).
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