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# Estimating Population Parameters from Catches Large Relative to the Population

G. A. F. Seber and E. D. Le Cren
Journal of Animal Ecology
Vol. 36, No. 3 (Oct., 1967), pp. 631-643
DOI: 10.2307/2818
Stable URL: http://www.jstor.org/stable/2818
Page Count: 13
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## Abstract

Where two successive catches, c1 and c2 are taken with the same effort from a population, an estimate of the size of the population, ñ, is given by $\tilde{n}=c_{1}{}^{2}/(c_{1}-c_{2})$, with a variance ${\rm var}\ [\tilde{n}]=[c_{1}{}^{2}c_{2}{}^{2}(c_{1}+c_{2})]/(c_{1}-c_{2})^{4}$ Estimates from more than two successive catches, from single catches and of mortality rates are discussed and formulae given. Simple mark-recapture experiments can be combined with repeated catch experiments.

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