ch53 - Outline What is population and population ecology?...

Info iconThis preview shows pages 1–17. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Outline What is population and population ecology? Density and dispersion How to calculate density Quadrant sampling mark and recapture Different types of dispersion: uniform, clumped and random Demography: life tables ,survivorship curves Exponential and logistic growth Population Ecology What are some of the questions studied by population ecologist? is the study of how and why the number of individuals in a population changes over time. Galapagos Population ecology Definitions in population ecology A population is a group of individuals from the same species that live in the same area at the same time. Members of a population rely on the same resources These members are influenced by similar environmental factors. There is a high likelihood of interacting and breeding with one another. elephant seal Three fundamental characteristics of individuals in any population are Density: is the number of individuals per unit area Dispersion: is the pattern of spacing among individuals within the boundaries of the population. Demographics: study of vital statistics of population and how it changes. Density Density is the number of individuals per unit area or volume The number of oak tress per squares kilometers in Santa Clara county. Density Factors that affect density . Density of a population is affected by Birth (Mortality) Death is the influx of new individuals from other areas is the movement of individuals out of a population Immigration Emigration Births Deaths Deaths and emigration remove individuals from a population. Emigration Births and immigration add individuals to a population. Immigration Closed Vs Open population Closed populations Open populations --those populations that do not change in size at all due to births, deaths, immigration,or emigration when you are studying the population. are those that can fluctuate in size and composition. Especially for animals that are mobile (emigration and immigration ). How to calculate population density? Measuring density of populations is a difficult task. 1. It is almost always impractical to count all the individuals in a population. Ecologists can count individuals, but they usually estimate population numbers. variety of sampling techniques to estimate densities and total population sizes are used. 2. 3. A Methods of calculating populations Quadrant Sampling Mark and recapture method Census Number of nests Burrows Tracks Fecal droppings. Quadrant sampling Quadrant sampling: is used for Open population 1. Count the number of individuals in randomly located plots. 2. Calculate the average density in the samples. Quadrant sampling works well when many sample plots are used and when the habitat is fairly homogenous....
View Full Document

This note was uploaded on 01/18/2010 for the course BIO SCI 104 taught by Professor Lin during the Spring '09 term at UC Davis.

Page1 / 134

ch53 - Outline What is population and population ecology?...

This preview shows document pages 1 - 17. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online