lecture note 16 for BGYB50

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Biological Sciences
Herbert Kronzucker

LECTURE 16: - An analysis of the age distribution of natural populations is key to understanding whether a population is in decline (possibly towards extinction, or successional replacement), or is growing (possibly to pest dimensions), or whether it is oscillating in abundance (e.g. Canadian lynx and snowshoe hare) - An example of a declining population includes the cottonwoods of the Rio Grande riverbanks, which show only very few individuals in the youngest age classes (each age class is known as a cohort); other species are in the process of displacing the cottonwoods: secondary succession is eliminating the cottonwoods! - An example of an expanding population includes the oak forests of southern Illinois, where the largest fraction of individuals of the population was found in the youngest cohort, i.e. natural regeneration of the oaks was excellent - Age distributions are used heavil
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