Population Ecology

# Population Ecology - P opulation Ecology I Int roduction a...

This preview shows pages 1–3. Sign up to view the full content.

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 organism’s 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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
II. 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.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern