Showing papers on "Diversity index published in 1978"
TL;DR: In this paper, the effects of six factors on the value of Shannon's diversity index were examined using data collected from the River Cynon, a polluted river in South Wales, and it was recommended that these be taken into consideration when interpreting and comparing index values.
90 citations
TL;DR: In this article, an interpretation of the community response of benthic macroinvertebrates to pollution in the Millers River, Massachusetts is developed from species presence-absence and abundance data in conjunction with published information on the species' environmental tolerances as compared to chemical water quality data.
Abstract: The assumption that water pollution causes a depression in the diversity of benthic macroinvertebrates as measured by the Shannon index and similar diversity indices is questioned. An interpretation of the community response of benthic macroinvertebrates to pollution in the Millers River, Massachusetts is developed from species presence-absence and abundance data in conjunction with published information on the species' environmental tolerances as compared to chemical water quality data. This interpretation is compared with one derived solely from diversity index values. The interpretations are quite different; the differences may be attributed to other environmental factors such as impoundments and flow reductions which influence the fauna and thus the diversity index value, but which are not related to pollution. In addition, several intrinsic features of the diversity indices increase their bias.
60 citations
TL;DR: In this paper, the authors analyzed core top and grab samples from the western North Atlantic to determine what aspects of planktonic foraminiferal abundance and diversity are most closely related to ocean circulation.
13 citations