Comparative efficacy of benthic biotic indices in assessing the Ecological Quality Status (EcoQS) of the stressed Ulhas estuary, India.

Abstract:

:Ecostatus of Ulhas estuary, one of the most polluted estuaries along the industrialized and urbanized northwest coast of India, was evaluated by six widely accepted benthic indices viz. H'(log2), AMBI, M-AMBI, BENTIX, BOPA and BO2A to test their efficiency in a tropical setting. The mesohaline zone, which presented eutrophic conditions, was classified as 'bad' by all indices due to the azoic status. Despite significant correlations obtained between indices, there were discrepancies in the accurate level of EcoQS assigned to each station. AMBI was observed to be most efficient in indicating a clear spatial variability from a 'poor' to 'bad' ecological quality status in the middle and upstream zones to an improved status in the downstream region. Limitations of all indices are discussed in light of their suitability for assessing the estuarine environmental condition. The present results could provide a fillip to environmental improvement initiatives currently being undertaken in the estuary.

journal_name

Mar Pollut Bull

authors

Mulik J,Sukumaran S,Srinivas T,Vijapure T

doi

10.1016/j.marpolbul.2017.05.014

subject

Has Abstract

pub_date

2017-07-15 00:00:00

pages

192-202

issue

1-2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(17)30400-9

journal_volume

120

pub_type

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