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Why would you use complete count?
- species on an open range
- species congregate in a certain area
- small study area
What is a population abundance?
number of individual animals
What is population density?
number of individuals per unit area
What is a census?
complete count of all animals in a population
What is a population estimate?
approximation of the true population size based on sampling method
What is a measure of how close a population estimate can be repeated?
What is a measure of how close a population estimate is to the true population size?
What is the difference between expected value and actual population size?
What are drives?
observers walk a line and count
Why would you use territorial mapping?
- birds/mammals that defend a territory
- usually count males only
What is an open population?
individuals may move in and out of the population via births, deaths, emigration, or immigration
What is a closed population?
demographic and geographic closure; no births or deaths, emigration or immigration between sampling periods
What is a population index?
measures population compared to other measures of population in the same area
What is the confidence interval?
- reliability of a population estimate
- expressed as percentage
How can you census animals?
- complete counts
- territorial mapping
- aerial surveys
- remote sensing
- ground transects
- call counts
- pellet-group counts
Why would you use an aerial survey?
- rough or inaccessible terrain
- common for elk, pronghorn, mule deer, bighorn sheep
What is remote sensing?
- use infrared sensors and cameras
- used in certain situations
What is a call count?
- auditory index of population trends
- used for birds