Methods of Measuring Absolute Density. Total counts - count all the organisms present in a population Transect or quadrat sampling - counts along a known distance or in a known unit area (small). Represents a subsample of the population.
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x = age interval (days, months, years)
nx = the number of survivors at age interval x
dx = number of organisms dying from the beginning of x to the beginning of age x + 1
lx = proportion of organisms surviving to beginning of age interval x
qx = rate of mortality between the beginning of age interval x and the beginning of age x + 1
Lx = average number alive from age interval x to x + 1
Tx = “units of individuals times time units”
ex = mean life expectancy at the start of age x