In Chapter 1, we saw how it was possible to use simple methods to assess the species composition in an area and to give an idea of their relative abundances. Here, we consider methods that will allow us to derive estimates of population size or density or, where this is unnecessary or impossible, population indices. Armed with such information over a number of years, we can then track changes in population levels and, where appropriate, compare population levels between different sites. As described in Chapter 1, the distinction between a census and a survey is somewhat artificial, but here we use census to describe a particular type of survey that counts the total numbers in an area
CITATION STYLE
Gregory, R. D., Gibbons, D. W., & Donald, P. F. (2007). Bird census and survey techniques. In Bird Ecology and Conservation (pp. 17–56). Oxford University Press. https://doi.org/10.1093/acprof:oso/9780198520863.003.0002
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