title: The circular definition of populations and its implications for biological sampling.
authors.affiliation: Centre for Environmental Policy, Imperial College London, Silwood Park, Ascot, Berkshire SL57PY, UK.
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Harwood
mesh_terms: D000818:Animals; D017143:Fuzzy Logic; D006801:Humans; D008954:Models, Biological; D011157:Population Dynamics; D012494:Sampling Studies; D013045:Species Specificity; D013997:Time Factors