Biogeography, ecoregions, and geomorphology affect fish species composition in streams of eastern Oklahoma, USA

摘要: Stream fish assemblages are structured by biogeographical, physical and biological factors acting on different spatial scales. We determined how factors, geomorphology stream habitat, influenced species composition (presence–absence) in eastern Oklahoma, USA relative to the ecoregion biogeographic effects previously reported. sampled surveyed habitat at 107 sites Boston Mountains, Ouachita Ozark Highlands ecoregions Oklahoma. Partial canonical correspondence analyses (pCCAs) variance partitioning showed that patterns of endemism related drainage basins explained important variation all streams, but size local channel morphology more overall. were most explaining variability both northeastern southeastern Oklahoma streams. Local substrate characteristics secondarily important. Variables typically considered as (aquatic vegetation, etc.) had little effect composition.