Lincoln espoused the flyways concept of avian migration and introduced the Lincoln index method for estimating bird abundance from recaptures.
2.
If S = 0 ( that is, if there is no overlap ), then the Lincoln Index is undefined and no estimate is justified.
3.
He proposed a means to estimate the continent-wide population size of a bird species, using reports from hunters and counting " returns " ( birds killed that are wearing bands ); this metric became known as the Lincoln index.
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