Download Bird Census Techniques by Colin J. Bibby, Neil D. Burgess, David A. Hill, Simon Mustoe PDF

By Colin J. Bibby, Neil D. Burgess, David A. Hill, Simon Mustoe

During this booklet there are whole chapters dedicated to the main frequent chicken counting strategies, and makes an attempt to amalgamate different counting methodologies into significant teams have been made. Examples of using equipment are supplied anyplace attainable and the relative price of varied methods for answering particular questions is additionally addressed.

  • A newly revised variation of the immensely winning Bird Census Techniques
  • An solely new bankruptcy protecting the census equipment suggested for tropical habitats
  • Provides a concise consultant to varied census options and their possibilities and pitfalls

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Example text

Are the plots big enough to encompass any scarcer species of particular interest? 1). It is important that birds are mapped accurately and, at this scale, symbols can be positioned to within about 10-20 m which is probably comparable to the error to be expected in m a p reading. Other scales between 1:5000 and 1:1250 may be preferred depending on the density of birds on the plot. It may be useful to reproduce copies from a traced and simplified outline if the m a p is too cluttered. In open or uniform areas, it is essential to mark selected stones or trees, or other features on the ground and on the m a p so that any bird can be located accurately.

Fowler and Cohen (1986) provide an introduction with examples drawn from the bird world. If the variation in density from one small plot to another is little to do with the census method, then it is a property of the circumstances being studied. Nothing can be done to alter this fact apart from making the plots bigger, which is equivalent to taking more samples and averaging them. T h e correct response is not to put all the effort into one huge plot and get a single answer but to count several smaller plots.

Equally obviously, it is most improbable that all the birds breeding in the plot will be singing simultaneously. T h u s , unless birds from elsewhere or non-breeders are also coming in and being recorded, the count will not exceed the true number present but will inevitably tend to fall short of it. T h e results of this study would be said to be biased or inaccurate. They will on average fall below the true value but unfortunately we do not know to what extent this will be so. Bias is inevitable in almost any realistic bird census method and in general we know neither how large it is nor in what direction it lies.

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