a new species of hysterothylacium (nematoda: anisakidae) from the stomach of the red-spotted newt, notophthalmus viridescens, from pennsylvania fishless ponds.species of hysterothylacium ward & magath, 1917 (nematoda: anisakidae) have previously been reported only from marine and freshwater fishes. here, we describe a new species that infects red-spotted newts (notophthalmus viridescens), a north american amphibian species with fully aquatic adults. aside from the unique characteristic of infecting an amphibian host, the new species differs from congeners by the presence of lateral alae, the length of intestinal cecum (0.54–0.73 mm, 39.67–49.09% of es ...200919473051
variability of tetrodotoxin and of its analogues in the red-spotted newt, notophthalmus viridescens (amphibia: urodela: salamandridae).efts and adult specimens (n = 142) of the red-spotted newt notophthalmus viridescens from various locations in canada and usa were analyzed for the presence of tetrodotoxin (ttx) and of its analogues 6-epitetrodotoxin and 11-oxotetrodotoxin. considerable individual variations in toxin levels were found within and among populations from new hampshire, new york, pennsylvania, and virginia ranging from non-detectable to 69 μg ttx per g newt. ttx and its analogues were absent in efts and adults from ...201222197660
preliminary amphibian health survey in the delaware water gap national recreation detect aquatic animal diseases of national concern, 111 individual amphibians, including wood frogs rana sylvatica (28), spring peepers pseudacris crucifer (35), red-spotted newts notophthalmus viridescens (41), and gray tree frogs hyla versicolor (7), were sampled at seven different sites in the delaware water gap national recreation area (dgnra), pennsylvania, from june 14 to july 19, 2007. these samples were screened for batrachochytrium dendrobatidis and viral pathogens at the u.s. fish a ...201020848885
what drives chytrid infections in newt populations? associations with substrate, temperature, and shade.the pathogenic chytrid fungus batrachochytrium dendrobatidis (bd) is considered responsible for the population declines and extinctions of hundreds of amphibian species worldwide. the panzootic was likely triggered by human-assisted spread, but once the pathogen becomes established in a given region, its distribution is probably determined by local drivers. to assess the relative importance of potential drivers of infection in red-spotted newts (notophthalmus viridescens), we measured bd levels ...201021125308
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