A Multimetric Macroinvertebrate Index for the Implementation of the European Water Framework Directive in French Guiana, East Amazonia

摘要: Neotropical, overseas regions of Europe are subjected to the same water policy objectives as continental ones but were overlooked during recent developments bioindicators that fulfil Water Framework Directive guidelines. We designed a macroinvertebrate-based multimetric index [Indice Biotique Macroinvertebres de Guyane (IBMG)] assess ecological health in remote headwater-small streams French Guiana, Europe’s only region South America. Invertebrates sampled at 95 sites including reference and impacted river reaches, following standardized protocol. Among 102 biological metrics calculated from site-specific data, we selected exhibiting best trade-off between high discrimination efficiency, low specificity, redundancy stability under conditions. The IBMG is composed two taxonomic richness-based metrics, abundance-based one trait-related metric diversity (Shannon’s entropy). Each was weighted by its efficiency. Using test data set, found sensitive range disturbances Guiana. Finally, comparing with other indices developed neotropical countries reveals that, for several reasons, neotropics may perform well context sets used generate them would certainly fail be robust when elsewhere. Copyright © 2015 John Wiley & Sons, Ltd.