This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Population Ecology : I. Introduction: a. Deals extensively with numerical issues. i. Population size: 1. Birth and death rates. a. Birth Rate: the number of organisms born divided by the number of females divided by time. b. Death rate: the rate at which stuff dies. ii. Arrangements of organisms: 1. Clumped: all/most organisms collect in one area. 2. Random 3. Uniform: organisms are spread out, more so than one would think in a random assortment. iii. Range of organism: 1. If an organisms range is small, it may be endangered. 2. Humans have changed the ranges of many organisms. iv. Population growth: 1. Modeled by logistic growth curve. v. Population regulating factors: 1. Density-dependent effects: a. Factors that change in intensity based on population density. 2. Density-independent effects: a. Factors that do not change in intensity based on population density. I I. Demography: a. The science of statistics of populations. b. Developed for humans around 1900 because of interests of insurance companies. i. The science has since been expanded to plants and animals. c. Life table: i. A table that maps what happens to a population over a sequence of age intervals. ii. Cohort: the initial population. iii. Proportion of organisms who survive: l x 1. This, as a function of age, is logarithmic. 2. 3 types of organisms: a. Type I: most organisms live through life, and the majority of death occurs late in life....
View Full Document