Stream Characteristics Associated with Site Occupancy by the Eastern Hellbender, Cryptobranchus alleganiensis alleganiensis, in Southern West Virginia

Abstract Cryptobranchus alleganiensis alleganiensis (Eastern Hellbender) is an environmentally sensitive species that has experienced range-wide population declines. Diurnal rock-turning surveys were conducted in southern WV during the summer and fall of 2006 to assess the species' population status in this area and to examine the relationship between stream physico-chemical characteristics and site occupancy. Survey results suggest that Eastern Hellbender populations are rare in southern WV, with Eastern Hellbender present at only ≈15% of all sites surveyed and only ≈20% of sites where they have been documented historically. Logistic regression models showed that presence of increased gravel substrate and specific conductivity reduced the probability of site occupancy by Eastern Hellbenders. It is not clear why a higher proportion of gravel substrate negatively affected site occupancy, because gravel should benefit Eastern Hellbender populations by providing larval habitat and habitat for prey species. T...