How to count kangaroos

摘要: The fundamental reason for counting kangaroos is to ensure that harvests are demonstrably sustainable. Given this goal, it essential the survey method should be able detect broad scale trends in population size. Aerial counts will only if constant (“correction factor”) relates number of sightings actual size either remains constant, or way which changes depending on environmental conditions known. Actual counts, and not an index, harvesting policy proactive, rather than simply reacting previous It evident from other papers volume there a particular problem estimating appropriate correction factors grey kangaroos. Several contributors suggested research programme produce better factors, would then used future correct raw sighting data. A solution may use “double sampling”, well-established sampling meth...