| redescription of the frog bladder fluke gorgoderina attenuata from the northern leopard frog, rana pipiens. | morphological characters used to differentiate north american bladder flukes, gorgoderina spp., are problematic and different authors use different morphological characteristics for distinguishing species. more importantly, no type specimens exist for 4 of the 12 north american species infecting anuran and caudatan hosts. a redescription of gorgoderina attenuata (stafford, 1902) stafford, 1905 is based on new collections from 6 species of anurans from arkansas, nebraska, new york, and wisconsin. ... | 2009 | 19642808 |
| alternative life cycle strategies and colonization of young anurans by gorgoderina attenuata in nebraska. | studies on life cycles and epizootiology of north american frog bladder flukes indicate that adult frogs become infected predominantly by ingesting tadpoles or other frogs that serve as second intermediate hosts for gorgoderid metacercariae. other studies have indicated that newly metamorphosed frogs are rarely infected with these parasites because they are gape-limited predators that cannot feed on large intermediate hosts such as tadpoles and other frogs. we examined the role of potential inte ... | 2009 | 19071953 |
| small frogs get their worms first: the role of nonodonate arthropods in the recruitment of haematoloechus coloradensis and haematoloechus complexus in newly metamorphosed northern leopard frogs, rana pipiens, and woodhouse's toads, bufo woodhousii. | studies on the life cycles and epizootiology of north american frog lung flukes indicate that most species utilize odonates as second intermediate hosts; adult frogs become infected by ingesting odonate intermediate hosts. newly metamorphosed frogs are rarely infected with these parasites, predominantly because they are gape-limited predators that cannot feed on large intermediate hosts such as dragonflies. we examined the role of the frog diet and potential intermediate hosts in the recruitment ... | 2007 | 17539412 |
| cytonuclear discordance across a leopard frog contact zone. | we conducted a genetic analysis of the extent of hybridization within and outside a contact zone between two north american leopard frogs, rana blairi and rana pipiens by comparing distribution patterns of mitochondrial and nuclear haplotypes. the contact zone, located between south dakota, nebraska, and iowa, usa, was previously examined using morphological data in the 1970s, leading to the conclusion that hybridization was rare between r. pipiens and r. blairi. our genetic analysis of 51 popul ... | 2007 | 17689987 |
| gonadal abnormalities in frogs (lithobates spp.) collected from managed wetlands in an agricultural region of nebraska, usa. | nebraska's rainwater basin (rwb) provides important wetland habitat for north american migratory birds. concern exists that pesticide and nutrient runoff from surrounding row-crops enters wetlands degrading water quality and adversely affecting birds and wildlife. frogs may be especially vulnerable. plains leopard (lithobates blairi) metamorphs from rwb wetlands with varying concentrations of pesticides were evaluated for a suite of biomarkers of exposure to endocrine active chemicals. froglets ... | 2013 | 22982548 |
| the spring runoff in nebraska's (usa) elkhorn river watershed and its impact on two sentinel organisms. | the objectives of the present study were to determine 1) if temporal variability influenced the toxicity of elkhorn river, nebraska, usa, water, and 2) if the toxic effect was consistent between 2 sentinel organisms, the fathead minnow (pimephales promelas) and the northern leopard frog (rana pipiens). during spring 2012, atrazine indicator strips were used to document the occurrence of agrichemical pulses in the elkhorn river. polar organic chemical integrative samplers (pocis) were deployed fo ... | 2013 | 23504772 |
| co-occurrence of haematoloechus complexus and rhabdias joaquinensis in the plains leopard frog from nebraska. | species of haematoloechus and rhabdias both are ubiquitous lung parasites of frogs, yet surprisingly little research has been conducted on the interactions between these worms. in a small nebraska stream, 256 rhabdias joaquinensis and 225 haematoloechus complexus were found in the lungs of lithobates (=rana) blairi. thirty-six of the 44 (82%) frogs were co-infected with h. complexus and r. joaquinensis whereas 5 (11%) frogs were infected with only 1 species and 3 (7%) frogs were uninfected. test ... | 2013 | 23116463 |
| helminth community structure in tadpoles of northern leopard frogs (rana pipiens) and woodhouse's toads (bufo woodhousii) from nebraska. | currently, little information is available on helminth community structure in tadpoles, the ephemeral, feeding, non-reproductive larva stages of anurans. we examined the helminth community structure in tadpoles of northern leopard frogs, rana pipiens, and woodhouse's toads, bufo woodhousii, from a first-order stream in western nebraska. specifically, we were interested in how species-specific difference in size, time to metamorphosis, and habitat partitioning among larval anurans affect their he ... | 2015 | 26346456 |