WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...
WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...
WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...
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The second highest endemism score in Australia for reptiles occurs in the area<br />
surrounding the Mitchell River. Rodentia (rodents) (top 0.3 per cent in the country)<br />
and Muridae (rats and mice) (top 0.3 per cent) show significant species richness<br />
scores. Rodents showing high values nationally in the Kimberley, coastal north<br />
Queensland, the MacDonnell ranges in central Australia and Kakadu/Arnhem Land.<br />
ANHAT analysis also showed strong results for endemism; nationally significant<br />
scores were found for Rodentia (rodents) (top 0.2 per cent) and Phalangeridae<br />
(possums) (top 0.3 per cent). Possums showed the second highest endemism score<br />
nationally, after the well recognised Queensland Wet Tropics hotspot. High endemism<br />
values for mammals where further supported by a comparison <strong>of</strong> IBRA bioregions,<br />
which showed the North Kimberley bioregion, which is dominated by the Kimberley<br />
Plateau, as having close to the highest index scores nationally (ANRA 2007c). Areas<br />
that contain new endemic species (i.e. species that have undergone major range<br />
contractions) are <strong>of</strong>ten important refugia for threatened species.<br />
ANHAT analysis has shown the Kimberley Plateau has a rich reptile, frog and bat<br />
fauna. Nationally significant species richness and endemism scores were found for<br />
both the Diporiphora (dragons) and Gekkonidae (geckoes). These scores largely<br />
reflect the presence <strong>of</strong> the highly restricted dragons Diporiphora convergens and D.<br />
superba, the cave geckoes Pseudothecadactylus cavaticus and P. lindneri and Oedura<br />
gracilis, a velvet gecko only found on the Kimberley Plateau. The highest national<br />
endemism score for Boidea (pythons) occurs in the Kimberley Plateau, resulting from<br />
the presence <strong>of</strong> the rough-scaled python (Morelia carinata), only known from the<br />
Kimberley Plateau. The distinct high rainfall zone <strong>of</strong> the northwest Kimberley is a<br />
centre <strong>of</strong> species richness for frogs, in fact it is the only region in Australia that<br />
contains high richness values for both <strong>of</strong> the endemic Australian frog families,<br />
Hylidae (tree frogs) and Myobatrachidae (Southern frogs). ANHAT endemism scores<br />
were found for Hylidae with the presence <strong>of</strong> Litoria splendida, L. cavernicola and<br />
Cyclorana vagita, which are restricted to the Kimberley. High Kimberley Hylidae<br />
endemism values were supported by phylogenetic analysis, which has confirmed there<br />
is a high genetic diversity among restricted species <strong>of</strong> the Kimberley Hylidae<br />
(Rosauer, D., pers. comm., June 2008). Myobatrachidae show a very high endemism<br />
score due to the presence <strong>of</strong> a number <strong>of</strong> restricted species, including Uperoleia<br />
marmorata, U. micra and Crinia fimbriata (Cogger 1992; Tyler et al. 2009).<br />
Nationally high endemism scores are also recorded for microbats <strong>of</strong> the<br />
Hipposideridae and Vespertilionidae families, reflecting the presence <strong>of</strong> restricted<br />
species such as the Yellow-lipped Cave Bat (Vespadelus douglasorum), the Northern<br />
Long-nosed Bat (Hipposideros stenotis) and the Northern Pipistrelle (Pipistrellus<br />
westralis).<br />
Despite a wide range <strong>of</strong> bird species, ANHAT analyses showed no nationally<br />
significant scores for birds for the west Kimberley region. Maluridae returned high,<br />
but not nationally high, endemism scores due to the presence <strong>of</strong> what a single<br />
restricted species, the Black Grasswren (Amytornis housei). Further bird collection<br />
and observation over time may provide a higher level <strong>of</strong> significance for bird richness<br />
and endemism. The importance <strong>of</strong> mangroves as seasonal refuges for birds is<br />
discussed below in mangrove refugia.<br />
The Kimberley Plateau is important for land snail richness and endemism. These<br />
species are typically, but not exclusively, found in the vine thickets <strong>of</strong> the Kimberley.<br />
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