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Monitoring Kangaroo Populations in Southeastern New South Wales

1. This study was undertaken to assess the feasibility of conducting kangaroo surveys in an area encompassed by the Braidwood, Cooma, Goulburn, Gundagai and Yass Rural Lands Protection Boards (RLPBs). National Parks and State Forests comprise almost 30% of the region and were excluded from the survey area because they preclude commercial harvesting. 2. The area was visited and discussions were held with NSW National Parks and Wildlife Service (NPWS) and RLPB staff to develop some idea of the relative density distribution of kangaroos within the area. The distribution of licences for the non-commercial cull of kangaroos provided further indication of kangaroo distribution. 3. Because of the relatively high relief of the landscape and the relatively high proportion of tree cover in the area, a helicopter rather than a fixed-wing aircraft was suggested as the most suitable survey platform. Line transect sampling conducted as double counts should minimise bias and maximise repeatability of the population estimates. 4. Using information on tree cover and the relief of the landscape, the five RLPBs were stratified into probable areas of high, medium and low kangaroo density. This enabled survey effort to be allocated to each stratum to minimise the variance of the population estimate. 5. Based upon the density stratification of the area and information drawn from helicopter surveys conducted in the northern tablelands of NSW, a survey comprising 900 km of transect line is proposed to estimates kangaroo densities in the agricultural and grazing lands of the five RLPBs. 6. A risk assessment conducted to examine to combined effects of survey precision, survey frequency and harvest rate suggested an appropriate survey strategy would be to carry out triennial helicopter line transect surveys with a precision of 20%.