Environmental Determinates of Distribution for Dragonfly Nymphs (Odonata: Anisoptera) in Urban and Non-Urban East Texas Streams, USA

We collected environmental and habitat data for nymphs of 12 dragonfly species (Odonata: Anisoptera) from 91 stream sites throughout eastern Texas, including urban non-urban locations. Understanding the relationship dragonflies to structure other variables is crucial purpose conserving these insects better using them as predictive tools water quality assessments, refining tolerance values. The objectives this study were determine key influencing diversity distribution in Texas streams, further if differences those factors could be observed between nonurban sites. samples separately benthic habitats woody snag habitats. Significantly fewer have on (mean = 1.25) compared 14.67) (t-test, p 0.001). number among streams 9.83) was not significantly different than 6.08; t-test, 0.07). Detrended correspondence analysis locations showed that most are oriented closely streams. Snag shown poorly ordinated all species. A canonical 29 determinants distributional relationships complex often described by multiple factors.