Counting Populations. Terminology. Census = to count a group of organisms Real census = actually count all individuals Sample census = count a portion/sample (multiply by area) Transect = a real or imaginary line off of which you do a survey/count
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Determine threatened or endangered species
Set hunting seasons and bag or creel limits
Plan for future management or evaluate existing programs
5. Furbearers – car/spotlights surveying at night
6. Fish – electroshocking
7. Whales – boat transect – spotters with binoculars
8. Turtles/Birds – Capture, tag, and release
N = T x n/t
N = number of estimated animals in
T = total captured and tagged in first trial
n = number captured in second sample
t = number of marked animals in second
Twenty Snapping Turtles were captured at the beginning, tagged, and released. One year later, 10 Snapping turtles were captured, 4 of which were tagged from before. Using the previous equation we can estimate the population size of the Snapping Turtles in the area.
N = T x n/t
N = 20 x 10/4
N = 200/4
N = 50 Snapping Turtles
If the population count was done in an area of 5 square miles then the density of the turtles would be 10/square mile.
Between two samples there is birth, death, immigration (in), and emigration (out)
Tag should not be a factor to