Outcomes of the workshop: refining aerial surveys of kangaroos

Grigg, G. C.; Pople, Anthony

doi:10.7882/az.1999.034

Cited by 6 publications

(7 citation statements)

References 13 publications

(9 reference statements)

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“…Olsen and Low (2006) doubtless influenced the 2007-2011 plan, but there is no reference to that report in the list of references in the back of the plan, a plan which covered more background than its predecessor. In the circular to the draft of the 2002-2006 plan, and prominent within the 2007-2011 plan, is the reference to Pople and Grigg (1999). The significance here is that the Pople and Grigg (1999) document is on an official Commonwealth web site.…”

Section: Tracking Down the Records Of Kangaroo Management In Nswmentioning

confidence: 99%

“…In the circular to the draft of the 2002-2006 plan, and prominent within the 2007-2011 plan, is the reference to Pople and Grigg (1999). The significance here is that the Pople and Grigg (1999) document is on an official Commonwealth web site. That conveys authority, and it is a matter of importance in a world where plans of management for kangaroos have become subject to scrutiny in legal actions.…”

Section: Tracking Down the Records Of Kangaroo Management In Nswmentioning

confidence: 99%

“…The Commonwealth Government sought the views of Pople 12 and Grigg (1999) on the Commercial harvesting of Kangaroos in Australia, with the caveat that "the views expressed in the document are the views of the authors and may not represent the views of the State and Commonwealth Governments." The document is available on the web and one hopes that it does not become lost in time because it is a landmark review that influenced both state and federal policy on this matter.…”

Section: A Turning Point 1998mentioning

confidence: 99%

“…In chapter 8, entitled Sustainable use of wildlife for conservation, Pople and Grigg (1999) stated that, "Whereas kangaroo harvesting has in the past been approved primarily for damage mitigation, there is an increasing recognition of additional potential benefits to be had from focussing more directly on kangaroos as a sustainable, renewable resource ." "The contrasts between the two motivations for approving a harvest of kangaroos and between the consequent management actions are stark; if the aim is pest control, then quotas should be set high in order to bring numbers down.…”

Section: A Turning Point 1998mentioning

confidence: 99%

“…reducing pests, is a major wildlife management activity and one that is likely to attract attention. At the end of that workshop, Grigg and Pople (1999) concluded with the comment: "the need for regular, direct monitoring is also political. Being one of the largest harvests of terrestrial wildlife in the world and with a growing export trade, much attention is directed at the industry.…”

mentioning

confidence: 99%

See 4 more Smart Citations

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹

Lunney¹

2010

Australian Zoologist

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Section: Tracking Down the Records Of Kangaroo Management In Nswmentioning

confidence: 99%

Section: Tracking Down the Records Of Kangaroo Management In Nswmentioning

confidence: 99%

Section: A Turning Point 1998mentioning

confidence: 99%

Section: A Turning Point 1998mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹

Lunney¹

2010

Australian Zoologist

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How many are there? The use and misuse of continental-scale wildlife abundance estimates

Hone

Buckmaster

2014

Wildl. Res.

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The number of individuals in a wildlife population is often estimated and the estimates used for wildlife management. The scientific basis of published continental-scale estimates of individuals in Australia of feral cats and feral pigs is reviewed and contrasted with estimation of red kangaroo abundance and the usage of the estimates. We reviewed all papers on feral cats, feral pigs and red kangaroos found in a Web of Science search and in Australian Wildlife Research and Wildlife Research, and related Australian and overseas scientific and ‘grey’ literature. The estimated number of feral cats in Australia has often been repeated without rigorous evaluation of the origin of the estimate. We propose an origin. The number of feral pigs in Australia was estimated and since then has sometimes been quoted correctly and sometimes misquoted. In contrast, red kangaroo numbers in Australia have been estimated by more rigorous methods and the relevant literature demonstrates active refining and reviewing of estimation procedures and management usage. We propose four criteria for acceptable use of wildlife abundance estimates in wildlife management. The criteria are: use of appropriate statistical or mathematical analysis; precision estimated; original source cited; and age (current or out-of-date) of an estimate evaluated. The criteria are then used here to assess the strength of evidence of the abundance estimates and each has at least one deficiency (being out-of-date). We do know feral cats, feral pigs and red kangaroos occur in Australia but we do not know currently how many feral cats or feral pigs are in Australia. Our knowledge of red kangaroo abundance is stronger at the state than the continental scale, and is also out-of-date at the continental scale. We recommend greater consideration be given to whether abundance estimates at the continental scale are needed and to their use, and not misuse, in wildlife management.

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Estimating kangaroo density by aerial survey: a comparison of thermal cameras with human observers

2019

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ContextAerial surveys provide valuable information about the population status and distribution of many native and pest vertebrate species. They are vital for evidence-based monitoring, budget planning and setting management targets. Despite aircraft running costs, they remain one of the most cost-effective ways to capture distribution and abundance data over a broad area. In Australia, annual surveys of large macropods are undertaken in several states to inform management, and in some jurisdictions, to help set commercial kangaroo harvest quotas. Improvements in the cost efficiencies of these surveys are continually sought. Aerial thermal imaging techniques are increasingly being tested for wildlife surveys, but to date no studies have directly compared population data derived from thermal imaging with data collected by human observers during the same flight. AimsDuring an aerial survey of western grey kangaroos (Macropus fuliginosus), eastern grey kangaroos (M. giganteus) and red kangaroos (Osphranter rufus) across the state of Victoria, Australia, the objective was to conduct a direct comparison of the effectiveness of thermal camera technology and human observers for estimating kangaroo populations from aerial surveys. MethodsA thermal camera was mounted alongside an aerial observer on one side of the aircraft for a total of 1360km of transect lines. All thermal footage was reviewed manually. Population density estimates and distance sampling models were compared with human observer counts. Key resultsOverall, the kangaroo density estimates obtained from the thermal camera data were around 30% higher than estimates derived from aerial observer counts. This difference was greater in wooded habitats. Conversely, human-derived counts were greater in open habitats, possibly due to interference from sunlight and flushing. It was not possible to distinguish between species of macropod in the thermal imagery. ConclusionsThermal survey techniques require refining, but the results of the present study suggest that with careful selection of time of day for surveys, more accurate population estimates may be possible than with conventional aerial surveys. ImplicationsConventional aerial surveys may be underestimating animal populations in some habitats. Further studies that directly compare the performance of aerial observers and thermal imaging are required across a range of species and habitats.

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Outcomes of the workshop: refining aerial surveys of kangaroos

Cited by 6 publications

References 13 publications

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹

How many are there? The use and misuse of continental-scale wildlife abundance estimates

Estimating kangaroo density by aerial survey: a comparison of thermal cameras with human observers

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Outcomes of the workshop: refining aerial surveys of kangaroos

Cited by 6 publications

References 13 publications

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg1

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg1

How many are there? The use and misuse of continental-scale wildlife abundance estimates

Estimating kangaroo density by aerial survey: a comparison of thermal cameras with human observers

Contact Info

Product

Resources

About

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹

A history of the debate (1948-2009) on the commercial harvesting of kangaroos, with particular reference to New South Wales and the role of Gordon Grigg¹