Abstract
AbstractHyla squirella was not known to occur on Delmarva until an established population was discovered at the southernmost tip of the peninsula in the Eastern Shore of Virginia Natural Wildlife Refuge in 2005. Male vocalizations were heard periodically throughout the refuge during daytime and evening hours from 27 May to 7 September 2006. Large choruses of males were heard 27 May and 9 and 27 June 2006. A large breeding event was observed on 9 June in a temporary pond. The smallest mature male was 27 mm SVL and weighed 1.1 g and the smallest mature female was 31 mm SVL, 1.7 g, and gravid. Mean adult male SVL was significantly smaller than the mean for adult females. Metamorphs found on 19 October averaged 13.0 ± 0.21 mm SVL and weighed 0.164 ± 0.009 g. Ecological and life history parameters of the introduced population of H. squirella on Delmarva do not appear to differ from those of populations in the natural portion of its range. This established population offers opportunities to elucidate a variety of questions about northward range expansion, genetics, and tolerance limits.
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