An evaluation of deviation from the lognormal distribution among species as a pollution indicator in marine benthic communities
Identifieur interne : 002D68 ( Istex/Curation ); précédent : 002D67; suivant : 002D69An evaluation of deviation from the lognormal distribution among species as a pollution indicator in marine benthic communities
Auteurs : Walter G. Nelson [États-Unis]Source :
- Journal of Experimental Marine Biology and Ecology [ 0022-0981 ] ; 1987.
Abstract
A graphical probability-plot method for detection of pollution in marine communities based on deviations from the lognormal distribution of abundance among species has been proposed (Gray & Mirza, 1979). An extensive group of marine benthic studies was used to empirically define the conditions under which the probability-plot methodology may apply by determining inherent levels of deviation from the lognormal distribution in marine benthic systems. Levels of deviation from the lognormal in unpolluted marine-benthic communities determined with the probability-plot method were on the order of 6% for replicate samples within a station, 29% based on temporal variation at a single station, and 23% based on spatial differences in location of stations, suggesting that a high inherent level of variability may make application of the probability-plot method generally difficult. The probability-plot method appears inappropriate for use in intertidal situations or with field or laboratory experimental manipulations of benthic communities. Physical disturbance failed to generate the predicted deviations from the lognormal in some cases. Four proposed indices of disturbance or pollution were not suitable as such. No association of either the log series or lognormal distributions with pollution or disturbance status of samples was seen. Extreme caution in the use and interpretation of results based on the probability-plot method is strongly recommended.
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DOI: 10.1016/0022-0981(87)90164-X
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