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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4.1 Quadrat Size and Shape . ... Quadrat counts have been used extensively on
plants, which rarely run away while being counted, but they are also suitable for
kangaroos or caribou if the person counting is swift of vision or has a camera.
To calculate confidence limits on estimates of abundance from quadrat data, you
need to know the spatial pattern of the individuals. If organisms are spread
randomly in space, counts from quadrats will fit a Poisson frequency distribution
A second index proposed by Perry (1995a) is based on a similar approach, but
instead of reassigning the individuals at random to quadrats, you reassign the
counts to different quadrats. This approach tests the spatial arrangement of the ...