Publications

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helminth infracommunities of the frogs rana catesbeiana and rana clamitans from turkey marsh, michigan.one hundred twenty-seven bullfrogs, rana catesbeiana, and 120 green frogs, rana clamitans, collected in july and august 1987 from turkey marsh, michigan, were examined for helminths. of the 16 helminth species found, falcaustra catesbeianae had the highest prevalence and mean intensity in bullfrogs. in green frogs, megalodiscus temperatus had the highest prevalence and haematoloechus parviplexus had the highest mean intensity. taxonomically, 1,030 (30.5%) trematodes and 2,348 (69.5%) nematodes o ...19912040950
helminth communities of green frogs rana clamitans latreille, from southwestern michigan.a total of 239 green frogs rana clamitans, collected between june 3 and august 27, 1998 from 6 locations in southwestern michigan, was examined for helminths. of the 26 helminth taxa found, the larval cestode mesocestoides sp. had the highest mean intensity, followed by the larval trematode fibricola sp. of the helminths that mature in frogs, haematoloechus varioplexus had the highest prevalence and gorgodera amplicava had the highest mean intensity. frogs from 118th pond had the highest species ...200111695416
sediment tcdd-eqs and erod and mrod activities in ranid frogs from agricultural and nonagricultural sites in michigan (usa).in vitro studies have demonstrated atrazine-mediated induction of 7-ethoxyresorufin o-deethylase (erod) activity. erod is an enzyme active in the metabolism of many compounds, including many xenobiotics. these studies have suggested that atrazine may affect reproductive function by altering steroid metabolism. the goal of this study was to determine whether relationships could be detected between measured atrazine concentrations in surface waters and the liver-somatic index (lsi) and erod and 7- ...200616788744
plasma steroid hormone concentrations, aromatase activities and gsi in ranid frogs collected from agricultural and non-agricultural sites in michigan (usa).the triazine herbicide atrazine has been hypothesized to disrupt sexual development in frogs by up-regulating aromatase activity, resulting in greater estradiol (e2) concentrations and causing feminization in males. the goal of this study was to collect native ranid frogs from atrazine-exposed ponds and determine whether relationships exist between measured atrazine concentrations and the gonadosomatic index (gsi), plasma concentrations of testosterone (t), e2 or 11-ketotestosterone (kt), or wit ...200616427146
atrazine concentrations, gonadal gross morphology and histology in ranid frogs collected in michigan agricultural areas.the triazine herbicide atrazine has been suggested to be a potential disruptor of normal sexual development in male frogs. the goals of this study were to collect native ranid frogs from sites in agricultural and non-agricultural areas and determine whether hypothesised atrazine effects on the gonads could be observed at the gross morphological and histological levels. juvenile and adult green frogs (rana clamitans), bullfrogs (r. catesbeiana) and leopard frogs (r. pipiens) were collected in the ...200616300839
the distribution of echinostome parasites in ponds and implications for larval anuran survival.parasites can influence host population dynamics, community composition and evolution. prediction of these effects, however, requires an understanding of the influence of ecological context on parasite distributions and the consequences of infection for host fitness. we address these issues with an amphibian - trematode (digenea: echinostomatidae) host-parasite system. we initially performed a field survey of trematode infection in first (snail) and second (larval green frog, rana clamitans) int ...201728073389
organochlorine insecticides, polychlorinated biphenyls, and metals in water, sediment, and green frogs from southwestern michigan.in an attempt to explain the etiology of frog deformities and population declines, many possible causative factors have been examined, including the input of synthetic chemicals into aquatic systems, where frogs spend much of their lives, including their entire developmental stages. deformities in populations of green frogs in wetlands of southwestern michigan that are influenced by agricultural, urban, or industrial inputs were assessed in this study. of the 1445 green frogs (rana clamitans) ex ...200111459136
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