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Measures of the Amount of Ecologic Association Between Species

Measures of the Amount of Ecologic Association Between Species MEASURES OF THE AMOUNT OF ECOLOGIC ASSOCIATION BETWEEN SPECIES LEER. DICE University of Michigan In many ecologic studies there is need occur, and by n the total number of sam­ to express in a quantitative manner the pies examined. The chance of species degree to which two different species are A occurring in any particular sample in associated in nature. Nevertheless, no the series is therefore a/n. Similarly, the such measure has up to the present time chance of species B occurringin any sam­ by ecologists. pie is b/n. The chance that species A come into general use Of the measures of association between and B will both occur in any given sam­ species previously proposed, the "coeffi- pie is a/n X b/n. The number of sam­ cient of association" of Forbes ('07) is pies in the series in which species A and useful, though no estimate of its statisti- B would be expected to occur together is cal reliability has in the past been em- therefore a/n X b/n X n or ab/n. To ployed. The "coefficient of association" obtain the coefficient we now divide the of Michael ('20) is too complicated for number of samples (h) in http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Wiley

Measures of the Amount of Ecologic Association Between Species

Ecology , Volume 26 (3) – Jul 1, 1945

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References (8)

Publisher
Wiley
Copyright
© Society for Community Research and Action
ISSN
0012-9658
eISSN
1939-9170
DOI
10.2307/1932409
Publisher site
See Article on Publisher Site

Abstract

MEASURES OF THE AMOUNT OF ECOLOGIC ASSOCIATION BETWEEN SPECIES LEER. DICE University of Michigan In many ecologic studies there is need occur, and by n the total number of sam­ to express in a quantitative manner the pies examined. The chance of species degree to which two different species are A occurring in any particular sample in associated in nature. Nevertheless, no the series is therefore a/n. Similarly, the such measure has up to the present time chance of species B occurringin any sam­ by ecologists. pie is b/n. The chance that species A come into general use Of the measures of association between and B will both occur in any given sam­ species previously proposed, the "coeffi- pie is a/n X b/n. The number of sam­ cient of association" of Forbes ('07) is pies in the series in which species A and useful, though no estimate of its statisti- B would be expected to occur together is cal reliability has in the past been em- therefore a/n X b/n X n or ab/n. To ployed. The "coefficient of association" obtain the coefficient we now divide the of Michael ('20) is too complicated for number of samples (h) in

Journal

EcologyWiley

Published: Jul 1, 1945

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