BIOLOGY 1M03 Lecture Notes - Lecture 30: Whooping Crane, Escherichia Coli, Net Reproduction Rate
27 Mar 2017
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Count estimate by aerial counts of large organisms, especially in migration or in nesting colonies. Assumes non-migrating and mixing population: capture and mark a number of individuals, release marked animals and allow them to mix, recapture a number of individuals and determine the fraction that are already marked (ex. Capture 300 of which 50 were marked: estimate population size assuming fair sampling of population m2/n2 = n1/n. Where n1 is # caught and marked in first capture. M2 is # of marked individuals caught in 2nd capture n2 is # of total individuals caught in 2nd capture. N total pop size: general growth equation. Assuming no immigration or emigration dn/dt = (b-d)*n. N = # individuals at current time: all else equal, dn/dt is proportional to n. Incr b = decr. dn/dt substitute r for b d dn/dt = rn. Under ideal conditions a population grows at the intrinsic rate of increase r(max)
