New Zealand Journal of Zoology abstracts
The problems of analysis of pilot-reported bird-strikes as an index for actual
bird-strikes at airports
JENNIFER BROWN
Biomathematics Research Centre
University of Canterbury
Private Bag 4800
Christchurch, New Zealand
GRAHAM HICKLING
Ecology and Entomology Group
P.O. Box 84
Lincoln University
Canterbury, New Zealand
(The following is the first paragraph of the article, not the abstract) When it is not easy to make direct counts of animals, indirect methods such as index counts are often used (Seber 1982: 54). There are many examples of such indices; for example, in New Zealand changes in the catch rate of leg hold traps is a common method to monitor the size of possum populations. Other indices can be based on reported observations. For example, the oldest and largest wildlife survey in the world, the Christmas Bird Count sponsored by the Audubon Society, involves over 40 000 participants observing birds in localities throughout the United States and Canada (Butcher 1990).
Z99001
Received 23 January 1999; accepted 25 August 1999
PDF file of entire paper: medium quality (194K); (scanned from paper original: notes about this process)
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