Are alien fish a reliable indicator of river health

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Null model of biotic homogenization: a test with the European freshwater fish fauna (2007, background): “…and propagule pressure (e.g. Blackburn & Duncan, 2001); (ii) dispersal abilities and environmental tolerances of the introduced species (e.g. Kennard et al., 2005); and (iii) the environmental and biological attributes of the recipient region (i.e. climate, human-modified habitats…”
Assessment of an index of biological integrity (IBI) to quantify the quality of two tributaries of river Chenab, Sialkot, Pakistan (2009, background): “Kennard et al. (2005) and Habit et al. (2006) also recorded intolerant species from reference sites which gradually disappear from the sites with high level of contamination.”
Grass-dominated stream sites exhibit low fish species diversity and dominance by guppies: an assessment of two tropical pasture river basins (2009, background): “In fact, guppies’ dominance is indicative of possible anthropogenic environmental impacts (Kennard et al., 2005; Cunico et al., 2006).”
Climate change and its implications for Australia's freshwater fish (2011, background): “…will benefit from warmer temperatures, habitat degradation and increased modification of natural flow regimes (Bunn and Arthington 2002; Koehn 2004; Kennard et al. 2005), whereas others will be detrimentally affected by increases in flow ephemerality, disturbance and the surpassing of…”