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Title: Wildlife Management - Counting Animals
Description: These notes cover the considerations wildlife managers need to make when counting animals - using population surveys or census techniques - and some of the limitations of these techniques. These notes were for American Public University's Wildlife Management Class.
Description: These notes cover the considerations wildlife managers need to make when counting animals - using population surveys or census techniques - and some of the limitations of these techniques. These notes were for American Public University's Wildlife Management Class.
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Census is the total enumeration of the animals in an area
index is a number that has a proportional size to the population size – provide measures of
relative density and are only used in comparisons
total counts have two serious drawbacks
o inaccurate
o expensive
o tend to still be used for animals that are clumped, but the clumps are far apart (e
...
,
elephants, African buffalo)
two important considerations for sample counts
o selection of a random, unbiased sample
o choosing an appropriate experimental control
sampling is the technique of drawing a subset of sampling units from the whole and then
making deductions about the whole from the part
Precision is a measure of sampling error (ability to repeat measurements); Accuracy is a
measure of bias error (how close measurements are to the true value)
Important – is bias constant across sampling periods – then you need precise measurements
...
Precision is most often needed and gained by using efficient sampling, rigidly standardized
methods, and a large sample size
Bias errors derive from systematic distortion in the counting technique, the observer’s abilty to
detect animals, or the behavior of the animals
...
Can occur from
sampling schemes that do not sample all habitats
...
It is also convenient to sample with replacement when an area
is traversed repeatedly by aerial-survey transects
Transects or quadrats
Transects should go across the grain of the country, cross rivers rather than parallel, go up
slope rather than huge the contour
Title: Wildlife Management - Counting Animals
Description: These notes cover the considerations wildlife managers need to make when counting animals - using population surveys or census techniques - and some of the limitations of these techniques. These notes were for American Public University's Wildlife Management Class.
Description: These notes cover the considerations wildlife managers need to make when counting animals - using population surveys or census techniques - and some of the limitations of these techniques. These notes were for American Public University's Wildlife Management Class.