| 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 ... | 2012 | 22197660 |
| batrachochytrium dendrobatidis infection dynamics vary seasonally in upstate new york, usa. | the amphibian disease chytridiomycosis, caused by the fungus batrachochytrium dendrobatidis (bd), is a major cause of worldwide amphibian declines and extinctions. although several studies indicate that bd prevalence and infection intensity vary seasonally, temporal variation of bd at high-latitude sites, such as the northeastern usa, is still poorly characterized. we screened amphibians for bd monthly at 2 study sites in new york state from april to october 2011 and used quantitative polymerase ... | 2014 | 25144117 |