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A multimetric benthic macroinvertebrate index for the assessment of stream biotic integrity in Korea.

Authors
  • Jun, Yung-Chul1
  • Won, Doo-Hee
  • Lee, Soo-Hyung
  • Kong, Dong-Soo
  • Hwang, Soon-Jin
  • 1 Department of Environmental Science, Konkuk University, Seoul 143-701, Korea. [email protected] , (North Korea)
Type
Published Article
Journal
International Journal of Environmental Research and Public Health
Publisher
MDPI AG
Publication Date
Oct 15, 2012
Volume
9
Issue
10
Pages
3599–3628
Identifiers
DOI: 10.3390/ijerph9103599
PMID: 23202765
Source
Medline
Language
English
License
Unknown

Abstract

At a time when anthropogenic activities are increasingly disturbing the overall ecological integrity of freshwater ecosystems, monitoring of biological communities is central to assessing the health and function of streams. This study aimed to use a large nation-wide database to develop a multimetric index (the Korean Benthic macroinvertebrate Index of Biological Integrity—KB-IBI) applicable to the biological assessment of Korean streams. Reference and impaired conditions were determined based on watershed, chemical and physical criteria. Eight of an initial 34 candidate metrics were selected using a stepwise procedure that evaluated metric variability, redundancy, sensitivity and responsiveness to environmental gradients. The selected metrics were number of taxa, percent Ephemeroptera-Plecoptera-Trichoptera (EPT) individuals, percent of a dominant taxon, percent taxa abundance without Chironomidae, Shannon’s diversity index, percent gatherer individuals, ratio of filterers and scrapers, and the Korean saprobic index. Our multimetric index successfully distinguished reference from impaired conditions. A scoring system was established for each core metric using its quartile range and response to anthropogenic disturbances. The multimetric index was classified by aggregating the individual metric ..scores and the value range was quadrisected to provide a narrative criterion (Poor, Fair, Good and Excellent) to describe the biological integrity of the streams in the study. A validation procedure showed that the index is an effective method for evaluating stream conditions, and thus is appropriate for use in future studies measuring the long-term status of streams, and the effectiveness of restoration methods.

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