| upstream effects of a reservoir on fish assemblages 45 years following impoundment. | fish assemblage structure, rarefied species richness, species diversity and evenness of assemblages upstream of a reservoir in oklahoma, u.s.a., were compared pre and post-impoundment as well as in contemporary collections from streams above and below the reservoir. there were significant shifts in assemblage structure between historical and contemporary collections above the reservoir but not between contemporary assemblages above and below the impoundment. indicator species analysis revealed t ... | 2013 | 23639160 |