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Bioregion in New South Wales, Australia From Wikipedia, the free encyclopedia
The South Western Slopes, also known as the South West Slopes, is a region predominantly in New South Wales, Australia. It covers the lower inland slopes of the Great Dividing Range, extending from north of Dunedoo through central NSW and into north-east Victoria, meeting its south-western end around Beechworth. More than 90% of the region is in the state of New South Wales and it occupies about 10% of that state – more than 80,000 km2.[1][2]
| South Western Slopes New South Wales | |||||||||||||||
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 The interim Australian bioregions, with South Western Slopes in red | |||||||||||||||
| Area | 86,811.26 km2 (33,518.0 sq mi) | ||||||||||||||
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| State electorate(s) | |||||||||||||||
| Federal division(s) | Eden-Monaro | ||||||||||||||
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The bioregion includes parts of the Murray, Murrumbidgee, Lachlan and Macquarie River catchments.[3]
The bioregion is divided into three sub-regions: [4]
Mean annual temperatures in the region range from very cool to warm; from just 8 °C (46 °F) up to 17 °C (63 °F) depending on altitude and latitude. The range in annual rainfall is likewise great; from just 400 millimetres (16 in) on the far western plain around Griffith, to as much as 1,700 millimetres (67 in) on the western face of the Snowy Mountains at Cabramurra.[5]
Depending on latitude, rainfall peaks in either winter or spring; the more southern and mountainous areas show a distinct winter peak, as opposed to one of springtime. High summer to mid autumn is usually the driest period and is prone to severe drought.
Snow is common on the higher slopes above an altitude of approximately 600 metres (2,000 ft) in the southernmost boundary of the region; and above 1,000 metres (3,300 ft) in the northernmost boundary, but may occur as low as 300 metres (980 ft) or less. Snow has been recorded on several occasions to fall and settle as low as Albury and Wagga Wagga, 165 metres (541 ft) and 180 metres (590 ft) respectively; and on three occasions even as low as Narrandera to the north-west, 145 metres (476 ft).[6] Sleet is a regular occurrence throughout the higher parts of the region, and occurs even in the lowland areas – especially in the south.
This region features the greatest seasonal range of maximum temperatures than any other in Australia, with some places ranging as much as 20 °C in maximum temperatures between January and July. This is due to being windward of the Great Dividing Range, with the prevailing westerly airmasses and accompanying cloud cover bringing low maximum temperatures in winter; and the far inland location, prolonging heatwaves in summer. These areas have a climate that is more similar to that of Adelaide and Perth, than the proximate cities like Sydney and Wollongong, with their wet winters and relatively dry summers.
The South West Slopes forecast area used by the Bureau of Meteorology includes only a region stretching approximately between Young and Tumbarumba from north to south. The area is much smaller than that defined as a bioregion by the NSW National Parks & Wildlife Service, as the Bureau of Meteorology has split this bioregion into three additional forecast districts: the Central West Slopes & Plains, constituting the northern parts of the bioregion; as well as North East (Victoria) and Riverina, which constitute the remaining south and west of the bioregion.[7]
Most of the site is modified wheat-growing and sheep-grazing country with only vestiges of its original vegetation. Remnant patches of woodland and scattered large trees, especially of mugga ironbark, apple box, grey box, white box, yellow box, red box, yellow gum, river red gum and Blakely's red gum, still provide habitat for the parrots. Protected areas within the site include several nature reserves and state forests, as well as the Livingstone and Weddin Mountains National Parks, and Tarcutta Hills Reserve.
An area of 25,653 square kilometres (9,905 sq mi), largely coincident with the bioregion, has been identified by BirdLife International as the South-west Slopes of NSW Important Bird Area (IBA) because it supports a significant wintering population of endangered swift parrots and most of the largest population of vulnerable superb parrots, as well as populations of painted honeyeaters and diamond firetails.[8]
The South Western Slopes of NSW are some of the most highly cleared and altered lands in the state. Native vegetation remains generally only in small, isolated patches. Substantial clearing continues. Less than 2% of the bioregion is protected as reserves. Conservation efforts are focussing on landholder stewardship agreements.[9][10]
The South Western Slopes were occupied by the Wiradjuri people, the largest Aboriginal language group in NSW.[11]
Notable towns and cities within the bioregion, from Beechworth in the south-west to Dunedoo in the north-east, include Wodonga, Albury, Corryong, Tumbarumba, Batlow, Narrandera, Wagga Wagga, Junee, Tumut, Gundagai, Cootamundra, Temora, West Wyalong, Grenfell, Young, Cowra, Forbes, Parkes, Wellington and Mudgee. Griffith, Leeton and Condobolin lay just outside the western boundary; while Orange, Crookwell and Yass lay just outside the eastern boundary of the bioregion.[1] The highland regions nearer the Great Divide can also be considered a part of the South Eastern Highlands bioregion.
Local government areas included in the bioregion:
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