Publications

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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. ...200919642808
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 ...200717539412
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 ...200919071953
distribution and reproductive strategies of gyrinicola batrachiensis (oxyuroidea: pharyngodonidae) in larvae of eight species of amphibians from nebraska.abstract a total of 462 tadpoles and salamander larvae of 8 species was examined for the presence of gyrinicola batrachiensis from 5 locations in nebraska. infection by g. batrachiensis occurred in tadpoles of rana blairi, r. catesbeiana, r. pipiens, and bufo woodhousii. tadpoles of hyla chrysoscelis, spea bombifrons, and pseudacris maculata and larvae of ambystoma mavortium were not infected with g. batrachiensis. population structure, defined as prevalence, mean abundance, and mean intensity o ...201121506837
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 ...200717689987
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 ...201323504772
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 ...201526346456
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