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#sampling methods

2 public questions tagged with this topic.

Density Dispersion Meta pop

Which sampling method assumes closed population?

The simplest two-sample Lincoln–Petersen mark–recapture model assumes demographic and geographic closure between sampling occasions. No births, deaths, immigration, or emigration should change the population or alter the proportion of marked individuals. Under closure, the marked fraction after thorough mixing remains interpretable, allowing M/N ≈ R/C and N ≈ MC/R. Quadrat and transect methods sample spatial units and do not inherently require a closed population in the same formal sense, although movement during counting can still create error. Satellite methods track individuals and may expl

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 9

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Which estimate method uses nested grids for sampling immobile species?

Quadrat sampling estimates abundance or density by placing frames or grid cells of known area and counting organisms within them. It is especially appropriate for immobile or slow-moving species such as plants, corals, barnacles, and many soil organisms because individuals remain associated with a sampling unit during observation. Nested quadrats place progressively larger frames around the same point or subdivide a larger grid, allowing investigators to examine species–area relationships, choose an efficient quadrat size, or measure pattern at multiple scales. A line transect records organism

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 9

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