| a new species of glossiphoniid leech from rana pretiosa (amphibia: ranidae) in oregon. | a new species of ectoparasitic glossiphoniid leech was found feeding on frogs in the nature center pond and elsewhere in deschutes county, oregon. the new species of placobdella resembles the southern alligator leech, placobdella multilineata moore, 1953, notwithstanding their vast geographic separation in north america. the new species is readily distinguished by possessing subdivided annuli, by its papillation and pigmentation patterns as well as by the arrangement of ovarian tissues. there is ... | 2006 | 16995404 |
| evaluation of the skin peptide defenses of the oregon spotted frog rana pretiosa against infection by the chytrid fungus batrachochytrium dendrobatidis. | population declines due to amphibian chytridiomycosis among selected species of ranid frogs from western north america have been severe, but there is evidence that the oregon spotted frog, rana pretiosa baird and girard, 1853, displays resistance to the disease. norepinephrine-stimulated skin secretions were collected from a non-declining population of r. pretiosa that had been exposed to the causative agent batrachochytrium dendrobatidis. peptidomic analysis led to identification and isolation, ... | 2013 | 23653106 |
| effects of the herbicide imazapyr on juvenile oregon spotted frogs. | conflict between native amphibians and aquatic weed management in the pacific northwest is rarely recognized because most native stillwater-breeding amphibian species move upland during summer, when herbicide application to control weeds in aquatic habitats typically occurs. however, aquatic weed management may pose a risk for aquatic species present in wetlands through the summer, such as the oregon spotted frog (osf, rana pretiosa), a state endangered species in washington. acute toxicity of h ... | 2013 | 23147474 |
| first report of hepatozoon sp. in the oregon spotted frog, rana pretiosa. | from 2005 through 2008, we screened 650 oregon spotted frogs (rana pretiosa) from three populations in central oregon, usa, for hemoparasites. a hepatozoon sp., not previously reported in r. pretiosa, was found in one population of frogs, mostly as intracellular gamonts at a prevalence of 10.5% with parasitemias ranging from 0.02% to greater than 42% of erythrocytes within individual frogs. intra-and extracellular merozoites were present, but rare. a potential vector, the mosquito culex boharti, ... | 2010 | 20688705 |
| widespread occurrence of the chytrid fungus batrachochytrium dendrobatidis on oregon spotted frogs (rana pretiosa). | the pathogen batrachochytrium dendrobatidis (bd) has been associated with amphibian declines in multiple continents, including western north america. we investigated bd prevalence in oregon spotted frog (rana pretiosa), a species that has declined across its range in the pacific northwest. polymerase chain reaction analysis of skin swabs indicated that bd was prevalent within populations (420 of 617 juvenile and adults) and widespread among populations (36 of 36 sites) where we sampled r. pretio ... | 2009 | 19526269 |
| hemoparasites in oregon spotted frogs (rana pretiosa) from central oregon, usa. | between 2001 and 2003, we screened blood smears of 156 oregon spotted frogs (rana pretiosa) from three populations in central oregon for blood parasites. a lankesterella sp. and a trypanosoma sp. were detected in 31% and 35% of the frogs, respectively. parasite loads were generally light, with lankesterella sporozoites in 1-2% of erythrocytes, and extracellular trypanosomes were seen at rates of about one parasite per 200 fields of view at 1,000x. little work has been published on hemoparasites ... | 2008 | 18436681 |