29.12.2012 Views

WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...

WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...

WEST KIMBERLEY PLACE REPORT - Department of Sustainability ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

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 />

85

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!