Resolving distribution and population fragmentation in two leaf-tailed gecko species of north-east Australia: key steps in the conservation of microendemic species
Lorenzo V. Bertola
A , Megan Higgie A and Conrad J. Hoskin A B
+ Author Affiliations
- Author Affiliations
A College of Science and Engineering, James Cook University, Townsville, Qld 4811, Australia.
B Corresponding author. Email: conrad.hoskin@jcu.edu.au
Australian Journal of Zoology 66(2) 152-166 https://doi.org/10.1071/ZO18036
Submitted: 21 May 2018 Accepted: 4 October 2018 Published: 2 November 2018
Abstract
North Queensland harbours many microendemic species. These species are of conservation concern due to their small and fragmented populations, coupled with threats such as fire and climate change. We aimed to resolve the distribution and population genetic structure in two localised Phyllurus leaf-tailed geckos: P. gulbaru and P. amnicola. We conducted field surveys to better resolve distributions, used Species Distribution Models (SDMs) to assess the potential distribution, and then used the SDMs to target further surveys. We also sequenced all populations for a mitochondrial gene to assess population genetic structure. Our surveys found additional small, isolated populations of both species, including significant range extensions. SDMs revealed the climatic and non-climatic variables that best predict the distribution of these species. Targeted surveys based on the SDMs found P. gulbaru at an additional two sites but failed to find either species at other sites, suggesting that we have broadly resolved their distributions. Genetic analysis revealed population genetic structuring in both species, including deeply divergent mitochondrial lineages. Current and potential threats are overlain on these results to determine conservation listings and identify management actions. More broadly, this study highlights how targeted surveys, SDMs, and genetic data can rapidly increase our knowledge of microendemic species, and direct management.
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