Conservation Science W. Aust. 12 : 1 (2017) Biodiversity in the southern rangelands: variation in biota over time and space on the Black Range and Lake Mason stations, Murchison Bioregion, Western Australia MARK A COWAN 1, DAPHNE EDINGER 2 AND KEVIN COATE 3 1 Science and Conservation Division, Department of Parks and Wildlife, Locked Bag 104, Bentley Delivery Centre, WA 6983 2 Western Australian Herbarium, Locked Bag 104, Bentley Delivery Centre, WA 6983 3 11 Peak View, Canning Vale WA 6155 Corresponding author:
[email protected] ABSTRACT This biodiversity survey examined the terrestrial vertebrate fauna, avifauna and vascular flora of two adjoining, ex-pastoral stations in the Murchison Bioregion of Western Australia. A diverse native biota was identified with at least 58 reptiles, 18 terrestrial mammals, 73 birds and 385 vascular plants documented. Few rare species were recorded and most species were typical of the Eremaean Botanical Province. Assemblage structure was assessed for 24 stratified sampling sites for reptiles, mammals and vascular flora. Significant indicator species were resolved for the various assemblage groups. Species accumulation data at the site and landscape scale and for each assemblage group, gained by sampling over two years and several seasons, were used to determine sampling adequacy for reptiles and mammals. By the end of the five survey periods, between 90–95% of trappable reptile species and 97–100% of mammal species had been recorded. Analysis of assemblage groups showed that three sampling periods for reptiles and four for mammals were adequate to determine the species assemblages of these two groups across all survey sites.