Patterns of plant diversity in ironstone ranges in arid south western Australia |
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| Institution: | 1. Department of Plant Biology, State University of Campinas (UNICAMP), CP 6109, CEP 13083-970 Campinas, SP, Brazil;2. Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), CEP 59625-900 Mossoró, RN, Brazil;3. Araripe National Forest, Praça Joaquim Fernandes Teles s/n, Bairro do Pimenta, CEP 63100-000 Crato, CE, Brazil;1. Universitätsklinikum Ulm, Prittwitzstr 43, 89075 Ulm, Germany;2. NZOZ Magodent, Fieldorfa 40, 04-0125 Warsaw, Poland;3. Przychodnia Lekarska NZOZ KOMED, Ul Wojska Polskiego 6, 62-500 Konin, Poland;4. Wojewodzkie Centrum Onkologii, Aleja Zwyci?stwa 31, 80-219 Gdansk, Poland;5. Centrum Onkologii Ziemi Lubelskieij, Doktor Kazimierza Jaczewskiego 7, 20-090 Lublin, Poland;6. Uniwersytet Medyczny w ?odzi, Wojewodzki Szpital Specjalistyczny im. M.Kopernika, Pabianicka 62, 93-513 Lodz, Poland;7. Hämato-Onkologische Gemeinschaftspraxis, Franz-Schrank-Str 2, 80638 Munich, Germany;8. Hôpital René Huguenin/Institut Curie, 35 Rue Dailly, Saint Cloud 92210, France;9. Fundacion Arturo Lopez Perez, Rancagua 878, Providencia, Santiago 7500921 Chile;10. Novartis Pharma AG, Basel, Switzerland;11. Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA;12. Department of Clinical Therapeutics, Alexandra Hospital, University of Athens School of Medicine, V.Sophias 80, 11528 Athens, Greece;1. School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, Sydney, NSW 2052, Australia;2. Australian Centre for Astrobiology, University of New South Wales, Kensington, Sydney, NSW 2052, Australia;3. Department of Geology, University of Pretoria, Pretoria 0002, South Africa |
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| Abstract: | Patterns of plant diversity were examined across 24 ironstone ranges in arid south western Australia. The high levels of beta diversity displayed between ranges primarily resulted from high turnover of perennial species and was not influenced by the lower species richness on the more arid ranges. The variance in composition of the vegetation across the ranges was evenly distributed between the broad spatial pattern and environmental factors measuring climate gradients, local site variables and soil chemistry. In contrast broad scale spatial and climatic gradients were most important in explaining the variance in perennial species richness. Ranges along the boundary of the Arid Zone appear to have acted as refugia during the climatic cycles of the Tertiary with several hotspots of species endemism and taxa with distributions centered on these ranges. On the more arid ranges these specialist ironstone taxa are largely absent. The variation in richness of these specialists taxa was strongly influenced by patterns in soil chemistry in addition to the broad scale spatial and climate gradients. The concentration of the ironstone specialist taxa is largely coincidental with the most prospective areas for iron ore mining and this will provide considerable challenges in conserving these unique ecosystems. |
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