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1. Populations of plants and animals typically fluctuate because of the combined effects of density‐dependent and density‐independent processes. The study of these processes is complicated by the fact that population sizes are typically not known exactly, because population counts are subject to sampling variance. Although the existence of sampling variance is broadly acknowledged, relatively few...
Chewing lice of the species Docophorulus coarctatus were extracted from museum specimens of their host, the great grey shrike Lanius excubitor, by combing feathers from 36 freshly shot birds (shot between 1962 and 1974), and samples of ten individual lice (five female, five male) were randomly collected for measurements from each bird. Female lice were bigger than males for all studied measurements...
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