MEPS 154:303-306 (1997)  -  doi:10.3354/meps154303

A further examination of two new taxonomic distinctness measures

Somerfield PJ, Olsgard F, Carr MR

In a previous note, Warwick & Clarke (1995; Mar Ecol Prog Ser 129:301-305) used 2 indices, Delta and Delta*, to demonstrate a continuous decrease in taxonomic distinctness of marine macrofaunal assemblages along a gradient of increasing environmental contamination, in a situation where species diversity remained constant, in the vicinity of 1 oilfield in the Norwegian sector of the North Sea. These indices are tested here using species abundance data from 3 other oilfields in the Norwegian sector, each sampled on 3 different occasions. No consistent pattern of decreasing taxonomic distinctness with increasing environmental contamination is evident.


Taxonomic distinctness · Macrobenthos · Norway · Offshore · Oilfields · Biodiversity


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