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Chapter 9 Population Distribution and Abundance

Chapter 9 Population Distribution and Abundance - Chapter 9...

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Chapter 9 Population Distribution and Abundance Population- is a group of individuals of a single species inhabiting a specific area. -The distribution of a population includes the size, shape, and location of the area it occupies. Density of a population is the number of them per unit area. The physical environment limits the geographical distribution of species. Distribution of Barnacles along an intertidal gradient- organisms have evolved different degrees of resistance to drying, as well as interspecific competition On Small Scales, individuals within populations are distributed in patterns that may be random, regular, or clumped; on larger scales, individuals within a population are clumped. 3 Basic patters- Random, Regular, and Clumped distribution patterns In General, population density declines with increasing organism size Aquatic invertebrates tend to have higher population densities than terrestrial invertebrates of similar size -As well as mammals tend to have higher population densities than birds of similar size. Rarity is influences by geographic range, habitat tolerance, and population size; rare species are vulnerable to extinction. When a species has small geographic range, narrow habitat tolerance, and low population density it is rare. As just one of these factors is not met, the animal becomes more and more rare.
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