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The flashcards below were created by user
alyssau12
on FreezingBlue Flashcards.
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Why would you use complete count?
- species on an open range
- species congregate in a certain area
- small study area
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What is a population abundance?
number of individual animals
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What is population density?
number of individuals per unit area
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What is a census?
complete count of all animals in a population
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What is a population estimate?
approximation of the true population size based on sampling method
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What is a measure of how close a population estimate can be repeated?
precision
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What is a measure of how close a population estimate is to the true population size?
accuracy
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What is the difference between expected value and actual population size?
bias
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What are drives?
observers walk a line and count
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Why would you use territorial mapping?
- birds/mammals that defend a territory
- usually count males only
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What is an open population?
individuals may move in and out of the population via births, deaths, emigration, or immigration
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What is a closed population?
demographic and geographic closure; no births or deaths, emigration or immigration between sampling periods
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What is a population index?
measures population compared to other measures of population in the same area
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What is the confidence interval?
- CI
- reliability of a population estimate
- expressed as percentage
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How can you census animals?
- complete counts
- drives
- territorial mapping
- aerial surveys
- remote sensing
- ground transects
- call counts
- pellet-group counts
- mark-recapture
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Why would you use an aerial survey?
- rough or inaccessible terrain
- common for elk, pronghorn, mule deer, bighorn sheep
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What is remote sensing?
- use infrared sensors and cameras
- used in certain situations
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What is a call count?
- auditory index of population trends
- used for birds
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