Benjamin/Cummings, 1999 - Science - 620 pages
This coherent text translates the methods of statisticians into "ecological English" so that students may readily apply these methods to the real world. Ecological Methodology, Second Edition provides a balance of material on animal and plant populations. It teaches students of ecology how to design the most efficient tests in order to obtain maximum precision with minimal work. The first part of the text focuses on biological and technical issues in statistical methodology. Students learn about advances that have been made in designing better sampling devices, along with the techniques and equipment used for sampling. The second part deals with creating solid statistical design, and presents all methods that are well-known to statisticians in a language and context that students will easily understand.
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The simplest methods add a boundary strip around the trapping area to estimate
the effective size of area trapped. Figure 3.7 illustrates the principle of a boundary
strip. The width of the boundary strip can be estimated in several ways ...
Each nested grid will have a larger and larger area of boundary strip as grid size
increases (Figure 3.9), and we can use the change in observed density to
estimate the width of the boundary strip for the population being studied.
The Clark and Evans test (equation (6.4]) is unbiased only when a boundary strip
is included in the study, but ecologists often do not use boundary strips because
they wish to maximize sample size (e.g., Figure 6.1). If the Clark and Evans test ...