Gulf Plains Bioregion

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Gulf Plains Bioregion Gulf Plains bioregion Description Figure 2 Monitoring data coverage Area: 121 100 km2 The Gulf Plains bioregion is characterised by extensive NT alluvial plains and coastal areas. The tropical savanna vegetation comprises mainly eucalypt and tea-tree open woodlands. The regional economy is mainly based on cattle grazing with some prawn fishing, QLD mining and tourism. Tenure is pastoral lease, Aboriginal land and nature reserves. Major population centres are Burketown, Normanton, Karumba and Doomadgee Aboriginal Community. bioregion and sub-IBRA boundary RMDC AussieGRASS data Location The Gulf Plains bioregion is located in the Gulf of Data sourcesMoni availabletoring data coverage Carpentaria in northern Queensland, with a small Data sources include: area (0.7% of bioregion area) in the Northern Territory (NT; see Figures 1 and 2). n Rapid Mobile Data Collection (RMDC) supported by AussieGRASS simulation (of pasture growth Figure 1 Location of the Gulf Plains and utilisation) and remote sensing (Multiple bioregion Regression Bare Ground Index, version bi1); these provide moderate reliability for reporting change (RMDC — road traverses and visual estimates; AussieGRASS — entire rangelands, simulated results with some ground validation) n domestic stocking density, which provides moderate reliability n fire extent, intensity and frequency, which provides high reliability n dust n distance from water n distribution and relative abundance of invasive animals and weeds Location of Gulf Plains bioregion n land use n land values. Gulf Plains bioregion 1 Climate Sustainable management The Gulf Plains bioregion has a monsoonal climate Critical stock forage with a winter dry season and a summer wet season. Spatially averaged median (1890–2005) rainfall is AussieGRASS, levels of simulated pasture 737 mm (April to March rainfall year; see Figure 3). utilisation and change Figure 3 Decile rainfall for the period The Donors Plateau sub-IBRA had space- and time- 1991–1992 to 2004–2005 averaged pasture utilisation for the 1991–2005 period 10 considerably above that considered a level of safe 9 utilisation for the Gulf Plains bioregion. Eight of the 8 7 remaining nine sub-IBRAs were rated marginal for 6 median sustainability (ie simulated utilisation was close to, and 5 4 more likely just above, the safe level). The Wellesley 3 Islands was the one exception where simulated Rainfall decile 2 1 utilisation was well below the threshold. 0 1991-92 1993-94 1995-96 1997-98 1999-00 2001-02 2003-04 Utilisation decreased by 2–4% in absolute terms Rainfall year between 1976–1990 and 1991–2005 on three Annual rainfall is for the 12-month period 1 April sub-IBRAs (Donors Plateau, Armraynald Plains and to 31 March. Woondoola Plains). This was an encouraging sign for pasture sustainability. There was little change in Decile rainfall was variable throughout the reporting utilisation elsewhere. period. The year 1991–1992 was very dry while 1998–1999 to 2000–2001 and 2003–2004 were Plant species richness notably wet periods. There are no suitable data for reporting change The intense nature of monsoonal and cyclonic in plant species richness. rainfall probably means that the spatially averaged rainfall reported here conceals local variability in Change in woody cover yearly rainfall across the Gulf Plains bioregion. Statewide Landcover and Trees Study (SLATS) reporting Landscape function Six of the ten sub-IBRAs have substantial woody cover (greater than 70%). In comparison, the Woondoola RMDC, change in visually assessed Plains, Armraynald Plains and Kurumba Plains sub- IBRAs are relatively ‘open’, with 2003 woody cover vegetation and soil attributes levels of 11.15% to 25.30%. There was very little contributing to landscape change in woody cover for any sub-IBRA between function score 1991 and 2003. There is high reliability for reporting Four sub-Interim Biogeographic Regionalisation for change in woody cover. Australia (IBRA) regions showed either some loss or significant loss of function (significant loss for the Distance from stock water Armraynald Plains and Doomadgee Plains, some loss Based on the locations of stock waterpoints sourced for the Donors Plateau and Mitchell Gilbert Fans). The from Geoscience Australia’s GEODATA TOPO 250K Woondoola Plains sub-IBRA was considered stable. vector product (Series 3, June 2006), the percentage RMDC data were insufficient to report for five other area within three kilometres of permanent and semi- IBRAs (Claraville Plains, Gilberton Plateau, Holroyd permanent sources of stock water for each sub-IBRA is: Plain — Red Plateau, Karumba Plains and Wellesley Islands). AussieGRASS simulation suggested these areas had stable landscape function. 2 Rangelands 2008 — Taking the Pulse Karumba Plains (GUP1) 7.1% Components of total Armraynald Plains (GUP2) 42.5% grazing pressure Woondoola Plains (GUP3) 38.8% Mitchell — Gilbert Fans (GUP4) 7.5% Domestic stocking density Claraville Plains (GUP5) 22.7% Most (93%) of the Gulf Plains bioregion is grazed. Holroyd Plain — Red Plateau (GUP6) 9.3% Data from the Australian Bureau of Statistics (ABS) Doomadgee Plains (GUP7) 6.8% showed that stocking density gradually increased Donors Plateau (GUP8) 37.0% from 7% below the 1983–1991 average in 1992 Gilberton Plateau (GUP9) 10.5% to equal the average in 1998. Stocking density then Wellesley Islands (GUP10) 5.9% decreased to 89% of this base in 1999 and increased GUP = Gulf Plains to 19% above the base in 2000. It then fluctuated at Note: complete sub-IBRA area analysed 10–20% above the base until 2003 and increased to Note that this analysis does not include the locations 27% above the 1983–1991 average in 2004. The increase of natural waters, which provide additional sources from 1999 onwards was probably facilitated by some of water for stock, particularly during and following wetter years. However, it is also likely that the growing the wet season. It is not possible to report change live export trade into Southeast Asia boosted the in watered area for the 1992–2005 period. expansion of cattle numbers in the Gulf Plains bioregion in the latter years of reporting. Note that spatial Weeds averaging conceals likely variation in stocking density trends across the bioregion. There is also reduced Weeds known to occur in the Gulf Plains bioregion reliability in ABS surveys of stock numbers in years include: between their full census (1997 and 2001). This is Common name Scientific name also likely to contribute to variability in stock African boxthorn Lycium ferocissimum numbers over time. Athel pine Tamarix aphylla Bellyache bush Jatropha gossypifolia Kangaroos Calotrope Calotropis procera There are no suitable data for reporting change Chinee apple Ziziyphus mauritiana in kangaroo populations. Giant rats tail grass Sporobolus natalensis and S. pyramidalis Invasive animals Hyptis Hyptis suaveolens Mesquite Prosopis spp. Invasive animal species known to occur in the Gulf Parkinsonia Parkinsonia aculeata Plains bioregion include: Parthenium weed Parthenium hysterophorus Common name Scientific name Prickly acacia Acacia nilotica subsp. Feral pig Sus scrofa indica Fox Vulpes vulpes Rubber vine Cryptostegia grandiflora Rabbit Oryctolagus cuniculus Salvinia molesta Salvinia molesta Wild dog Canis spp. Sicklepod Senna obtusifolia and Feral cat Felis cattus S. tora Cane toad Bufo marinus Sida spp. Sida spp. Starling Sturnus vulgaris Water hyacinth Eichhornia crassipes See www.anra.gov.au for distribution maps See www.anra.gov.au for distribution maps Gulf Plains bioregion 3 Products that support reporting Working Group indicator: Threatened communities; of landscape function and see Section 7 of Chapter 3 of Rangelands 2008 — Taking the Pulse). sustainable management In this bioregion, there are (Biodiversity Working Fire Group indicator: Threatened species): Moderate proportions (greater than 15%) of the n 6 threatened plant species bioregion were burnt in 1997, 2001 and 2004. The n 2 threatened mammal species annual area burnt in the late dry season (August to n 8 threatened bird species (including one extinct December) far exceeded the area burnt earlier in species, the paradise parrot) the year in all years between 1997 and 2005. Late dry-season fires are presumed to be more intense. n 3 threatened reptile species n no threatened amphibian or fish species. Year 1997 1998 1999 2000 2001 2002 2003 2004 2005 There are areas of dense rubber vine in the Gulf Plains % area bioregion (Biodiversity Working Group indicator: burnt 15.5 4.6 14.5 9.7 29.3 11.7 12.1 24.9 3.9 Transformer species). The frequency of fire between 1997 and 2005 was moderate to high compared with all rangeland Socioeconomic characteristics bioregions, with a mean frequency (log10 transformed) of 0.30. Land use and value Most (93%) of the Gulf Plains bioregion is grazed. Dust This area has not changed appreciably over the The mean Dust Storm Index value (1992–2005) was 1992–2005 reporting period. 0.76, which was a low value among all rangeland For Queensland, unimproved rangeland values as bioregions. Dust levels were slightly higher in the at June 2006 were, on average, $2876 ± $392/km2 central east and western parts. (values expressed in 2005 dollars). There was a large range in average unimproved value across sub-IBRAs Biodiversity ($38 to $12 610/km2). It is not possible to report change in land values. In Queensland, regional ecosystems are defined by Sattler and Williams (1999) as vegetation communities in a bioregion that are consistently associated with a Key management issues particular combination of geology, landform and soil. and features Descriptions of regional ecosystems can be sourced from the Regional Ecosystem Description Database.1 Key features and issues of the Gulf Plains bioregion are: There are 84 regional ecosystems described for the n Pasture utilisation is increasing in some areas. Gulf Plains bioregion, one of which is listed as endangered n There is a low fire frequency relative to similar and 17 of which are listed as ‘of concern’ under the areas in the NT and WA which may alter Queensland Vegetation Management Act 1999.
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