Carnarvon xeric shrublands

The Carnarvon xeric shrublands is a deserts and xeric shrublands ecoregion of Western Australia. The ecoregion is coterminous with the Carnarvon Interim Biogeographic Regionalisation for Australia (IBRA) bioregion.[2][3][4]

Carnarvon xeric shrublands Carnarvon bioregion
Map of IBRA bioregions, with Carnarvon in red
Ecology
Realm	Australasian
Biome	deserts and xeric shrublands
Borders	Pilbara shrublands, Southwest Australia savanna, and Western Australian mulga shrublands
Geography
Area	83,534 km^2 (32,253 sq mi)
Country	Australia
States	Western Australia
Conservation
Conservation status	Critical/endangered
Protected	4,025 km² (5%)[1]

Location and description

The ecoregion covers an area of 90,500 square kilometers (34,900 square miles) from the bounded by the Indian Ocean to the west from the Peron Peninsula in Shark Bay up to the North West Cape. The Pilbara shrublands lie to the northeast, the Western Australian mulga shrublands to the east, and the Southwest Australia savanna to the south. The region is named for the coastal town of Carnarvon and includes a number of coastal towns and tourist resorts.

The terrain is generally low, and the vegetation varies with the underlying geology, which consists mostly of recent alluvial, aeolian, and marine sediments over cretaceous strata. This is a very dry region with less than 250mm of rainfall per year.

The ecoregion covers the on-shore portion of the Carnarvon Basin, a physiographic province of the larger West Australian Shield division.

Sub-regions

The Carnarvon bioregion has two sub-regions:

• Wooramel, which is a significant part of the Shark Bay World Heritage area[5]
• Cape Range

Flora

Low samphire and saltbush shrublands cover the saline alluvial plains, snakewood scrublands cover the clay flats, Bowgada low woodland covers sandy ridges and plains, red sand dune fields are interspersed or overlain with tree to shrub steppe over hummock grasslands, and Acacia startii/A. bivenosa shrublands cover limestone outcrops in the north. Other trees in the area include limestone wattle (Acacia sclerosperma) with an undergrowth of dead finish (Acacia tetragonophylla). The sheltered embayments and extensive tidal flats along the coast support mangroves.

Fauna

Wildlife of the area includes birds such as the thick-billed grasswren and the red-tailed black cockatoo. This is also the area where it is possible that there may be a surviving population of the lesser stick-nest rat which is thought to be extinct.

Protected areas

Protected areas in the ecoregion include Cape Range National Park, Francois Peron National Park and Kennedy Range National Park.

Further reading

• Thackway, R and I D Cresswell (1995) An interim biogeographic regionalisation for Australia : a framework for setting priorities in the National Reserves System Cooperative Program Version 4.0 Canberra : Australian Nature Conservation Agency, Reserve Systems Unit, 1995. ISBN 0-642-21371-2

References

1. Eric Dinerstein, David Olson, et al. (2017). An Ecoregion-Based Approach to Protecting Half the Terrestrial Realm, BioScience, Volume 67, Issue 6, June 2017, Pages 534–545; Supplemental material 2 table S1b.
2. "Carnarvon xeric shrublands". Terrestrial Ecoregions. World Wildlife Fund.
3. Environment Australia. "Revision of the Interim Biogeographic Regionalisation for Australia (IBRA) and Development of Version 5.1 - Summary Report". Department of the Environment and Water Resources, Australian Government. Archived from the original on 5 September 2006. Retrieved 31 January 2007. Cite journal requires |journal= (help)
4. IBRA Version 6.1 Archived September 8, 2006, at the Wayback Machine data
5. Western Australia. Dept. of Environment and Conservation. (2007)Shark Bay terrestrial reserves and proposed reserve additions : draft management plan 2007 Department of Environment and Conservation ; Conservation Commission of Western Australia. Bentley, W.A.: Dept. of Environment and Conservation. pages 37-39 section Bioregions and Figure 4: IBRA sub-regions of the Shark Bay Area (map)