SQMCI: A biotic index for freshwater macroinvertebrate coded‐abundance data
作者:
JohnD. Stark,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1998)
卷期:
Volume 32,
issue 1
页码: 55-66
ISSN:0028-8330
年代: 1998
DOI:10.1080/00288330.1998.9516805
出版商: Taylor & Francis Group
关键词: benthic invertebrates;aquatic insects;sampling;biotic indices;biological monitoring
数据来源: Taylor
摘要:
A new freshwater macroinvertebrate‐based biotic index derived from the Quantitative Macroinvertebrate Community Index (QMCI) is proposed for use with coded‐abundance data collected from stony New Zealand streams using hand nets. The SQMCI (Semi‐Quantitative MCI) responds to changes in community dominance in a similar manner to the QMCI, but requires fewer replicate samples to achieve the same precision. In situations where macroinvertebrate densities are not required, the SQMCI provides a similar assessment to the QMCI with less than 40% of the effort, thus reducing the cost and/or improving the scientific defensibility of biomonitoring programmes. Variability of biotic indices must be known to enable detection of significant differences in water quality between streams, at different sites in the same stream, or between times at the same site. Best estimates of MCI and QMCI standard deviations have been updated, and newly derived for the SQMCI, for use in two statistical procedures for testing for significant differences between paired index values.
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