Carnarvon Xeric Shrublands

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The IBRA regions, with Carnarvon in red

The Carnarvon xeric shrublands is a deserts and xeric shrublands ecoregion of Western Australia, contiguous with the Carnarvon Interim Biogeographic Regionalisation for Australia (IBRA) bioregion.[1]

Location and description[edit]

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.

Flora[edit]

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 undergorwth of dead finish (Acacia tetragonophylla). The sheltered embayments and extensive tidal flats along the coast support mangroves.

Fauna[edit]

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.

References[edit]

  1. ^ "Carnarvon xeric shrublands". Terrestrial Ecoregions. World Wildlife Fund. 

Further reading[edit]

  • 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