BISC 100 Lecture Notes - Lecture 14: Intraspecific Competition, Rodent
16 Mar 2020
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Document Summary
In most cases, it is impractical or impossible to count all individuals in a population. Instead, ecologists use a variety of sampling techniques to estimate population density. Population densities may also be estimated by indicators such as number of bird nests or rodent burrows rather than by actual counts of organisms. Regulating population growth: density independent factors: in many natural populations, abiotic factors such as weather may limit or reduce population size well before other limiting factors become important. A population-limiting factor whose intensity is unrelated to population density is called a density-independent factor . These factors include seasonal changes in the weather and environmental disturbances, such as fire, floods, and storms.
