There are a number of studies which show little or no effect on invertebrate communities, but these may have been affected by the absence of source populations and dispersal-limitation (e.g. Sundermann et al. 2011 Ecol Apps), or potentially, spatial and temporal legacy effects. I'm interested to hear about studies that showed positive effects on stream invertebrate communities (e.g. increased abundances of EPT) through habitat augmentation and rehabilitation.