Heterogeneity in macroinvertebrate sampling strategy introduces variability in community characterization and stream trait-based biomonitoring: Influence of sampling effort and habitat selection criteria

摘要: Abstract Benthic macroinvertebrate assemblages have been of major importance in the biomonitoring rivers for many decades. To more closely fit with new regulatory purposes, standardized methods field sampling changed over time both terms effort and criteria habitat type priority (e.g. according to a decreasing gradient “bottom surface coverage” versus “substratum favorability”). Such methodological heterogeneity has rendered exploitation data far complex because they are indeed not fully comparable may induce bias long term series studies. In this context, we assessed influence variation strategy on (i) taxonomical characterization benthic (297 taxon abundances, taxonomic richness diversity, EPT-related metrics), (ii) response sensitivity descriptors (ASPT, SPEAR), (iii) bio-ecological trait description (iv) resulting ecological diagnostic river reaches, based 10,074 events across France. Six strategies were compared, corresponding three levels (4, 8 12 individual samples) different substratum selection; e.g. marginal (=