Assessing estuarine benthic quality conditions in Chesapeake Bay: A comparison of three indices
作者： A. Borja , D.M. Dauer , R. Díaz , R.J. Llansó , I. Muxika
DOI: 10.1016/J.ECOLIND.2007.05.003
关键词:
摘要: Abstract Legislation in US and Europe has been adopted to determine the ecological integrity of estuarine coastal waters, including, as one most relevant elements, benthic macroinvertebrate communities. It recommended that greater emphasis should be placed on evaluating suitability existing indices prior developing new ones. This study compares two widely used measures integrity, Benthic Index Biotic Integrity (B-IBI) developed USA European AZTI's Marine (AMBI) its multivariate extension, M-AMBI. Specific objectives were identify frequency, magnitude, nature differences assessment Chesapeake Bay sites ‘degraded’ or ‘undegraded’ by indices. A dataset 275 subtidal samples taken 2003 from this comparison. Linear regression B-IBI AMBI, accounted for 24% variability; however, when evaluated salinity regimes, explained variability increased polyhaline (38%), high mesohaline low (35%) habitats, remained similar tidal freshwater (25%), decreased oligohaline areas (17%). Using M-AMBI, 43% linear regression, 54% logarithmic regression. By regime, highest was found (53–63%), while lowest (6–17%). The total disagreement between methods, terms degraded-undegraded classifications, 28%, with spatial levels agreement. Our suggests different methodologies assessing quality can provide results even though these methods have within geographical areas.
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