Bird Ecology and Conservation A Handbook of Techniques

that simple survey approaches would be sufficiently good in some cases for monitoring. They would certainly be an improvement on ...

The relationship between relative and absolute counts may not be linear, so the fact that one number is twice the size of anothe ...

might be one of several predefined habitat types, patch sizes, management histories, or whatever is the target of study. Sample ...

A target list of likely species can help to remind you of what might be found but is still missing, and this can double as a sta ...

requires a high level of experience and care and effort to visit nets frequently. In pure bird survey terms, the return is poor ...

Pomeroy (1992) developed a rather more elaborate 1-h procedure in which birds are listed according to which of the six 10-min di ...

available to count as new. This is replicated several times. Target list lengths might be as small as 10 species in poor habitat ...

The simplest atlases have two weaknesses. First, they provide no measure of abundance. A rare species that is found to breed onc ...

is labor intensive. The largest atlases so far attempted have covered Australia, 6 countries of Southern Africa and Western Euro ...

marginal to the regular avifauna. The same thing happens in a smaller study area where there is a risk that later additions to a ...

and problems is considerable. On the other hand, the literature on bird numbers, habitats, distribution, and trends is increasin ...

Methods need to suit both purpose and available resources (money, manpower, and skill levels). To improve the rate of data gener ...

Data handling is a considerable cost in large bird surveys, such as atlases. This applies both to individual recorders and to th ...

Colwell, R.K. and Coddington, J.A. (1994). Estimating terrestrial biodiversity through extrapolation.Phil. Trans. R. Soc. Lond. ...

This page intentionally left blank ...

2. Bird census and survey techniques Richard D. Gregory, David W. Gibbons, and Paul F. Donald 2.1 Introduction In Chapter 1, we ...

associated with greater risk of extinction locally, regionally, or globally. Such information is collected by undertaking survey ...

demographic parameters, considered in Chapters 3 and 5, can also yield clues about the underlying demographic mechanisms, for ex ...

(1998, 2000), and Bennun and Howell (2002). In addition, Gilbert et al. (1998) and Steinkamp et al. (2003) outline species-speci ...

2.1.5 Population size or index? If the aim of our survey is to determine accurately the population size(
total numbers) of a spe ...