Distribution and population genetic structure of the critically endangered skink Nangura spinosa, and the implications for management
Journal Publication ResearchOnline@JCUAbstract
Many threatened species occur as small, isolated populations. Understanding the extent and genetic distinctiveness of these populations is essential for management. Nangura spinosa is a critically endangered skink known from two small populations in dry rainforest in south-east Queensland. We conducted targeted surveys between 2001 and 2010 at the two known N. spinosa sites (Nangur National Park, Oakview National Park area) and in 22 nearby forest blocks with potentially suitable habitat. N. spinosa was found only at the two previously known sites, which are similar to 36 km apart. The skink appears to be declining at Nangur NP, to an estimated extent of occurrence of 7.4 ha and potentially no more than 35 adults. In contrast, we increase the extent of occurrence at Oakview to 360 ha, where the population is at least in the hundreds. Sequencing of two mtDNA genes revealed considerable genetic divergence between the two populations (3.8% for ND4; 1.2% for 16S), suggesting an extended period of separation. Population fragmentation is therefore not the result of recent land clearing, but of long-term isolation by unsuitable habitat. Each population should be considered a distinct management unit. More data are required on population size and trends, recruitment and threats, particularly for the Nangur population.
Journal
Australian Journal of Zoology
Publication Name
Australian Journal of Zoology
Volume
58
ISBN/ISSN
1446-5698
Edition
N/A
Issue
6
Pages Count
7
Location
N/A
Publisher
CSIRO Publishing
Publisher Url
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Publisher Location
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Publish Date
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Url
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Date
N/A
EISSN
N/A
DOI
10.1071/ZO10070