title: The utility of two marine community indices to assess the environmental degradation of lotic systems using fish communities.
abstract: Multimetric approaches are commonly used to evaluate the ecological status of aquatic ecosystems. However, it has been recommended that the sensitivity of existing methods be improved through the investigation of the potential of new metrics to detect environmental disturbances. In this study we tested the effectiveness of two community indices (Taxonomic distinctness index (TDI) and Abundance biomass comparison (ABC) method), primarily proposed for marine ecosystems, to identify sites with different levels of environmental degradation in lotic systems using fish community data. Fish samples were collected over the period 2003-2011 at 131 sampling stations. To generate water and habitat quality classes, a self-organizing map (SOM) based on environmental data was applied. Gradients over the SOM map were investigated for the values of the TDI and ABC indices. The results of this study reveal that the values of both the TDI and ABC indices are highly correlated with water and habitat quality gradients. However, despite the observed correlation, the utility of TDI as a potential metric in bioassessment programs is rather limited, due to its lack of discriminatory power. In contrast, the ABC method could be proposed as a novel metric, but can only be applied in type-specific multimetric approaches.
authors.affiliation: Department of Biology and Ecology, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Nis, Serbia.
authors.forename: Milica
authors.initials: M
authors.lastname: Stojković Piperac
authors.affiliation: Department of Biology and Ecology, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Nis, Serbia. Electronic address: djuradj@pmf.ni.ac.rs.
authors.forename: Djuradj
authors.initials: D
authors.lastname: Milošević
authors.affiliation: Institute of Biology and Ecology, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
authors.forename: Snežana
authors.initials: S
authors.lastname: Simić
authors.affiliation: Institute of Biology and Ecology, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
authors.forename: Vladica
authors.initials: V
authors.lastname: Simić
mesh_terms: D000818:Animals; D044822:Biodiversity; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D005399:Fishes
keywords: Abundance biomass comparison (ABC) method; Bioassessment; Metric; Self-organizing map (SOM); Taxonomic distinctness index (TDI)