| quantitative measurement of batrachochytrium dendrobatidis in amphibian skin. | the ability to quantify infections provides a tool with which to perform comparative pathological research. the need exists for a simplistic standard method to compare infection levels of batrachochytrium dendrobatidis, a major cause of global amphibian declines. through examination of skin sloughs of the cape river frog afrana fuscigula, we present an accessible method that not only provides quantitative measurements of b. dendrobatidis, but also provides information that increases the confiden ... | 2006 | 17140138 |
| assessing the threat of amphibian chytrid fungus in the albertine rift: past, present and future. | batrachochytrium dendrobatidis (bd), the cause of chytridiomycosis, is a pathogenic fungus that is found worldwide and is a major contributor to amphibian declines and extinctions. we report results of a comprehensive effort to assess the distribution and threat of bd in one of the earth's most important biodiversity hotspots, the albertine rift in central africa. in herpetological surveys conducted between 2010 and 2014, 1018 skin swabs from 17 amphibian genera in 39 sites across the albertine ... | 2015 | 26710251 |
| description of advanced third-stage larvae of gnathostoma lamothei bertoni-ruiz et al. 2005 (nematoda: gnathostomatidae) from experimental hosts and contributions to its life cycle. | the advanced third-stage larvae (advl(3)) of gnathostoma lamothei was obtained from experimental hosts. frogs lithobates heckscheri and snakes nerodia fasciata pictiventris were compatible hosts allowing optimal larval development. advl(3) are 4,487.94 μm long, have two lateral cervical papillae between rows 10 and 16 and an excretory pore at row 23. the average counts of the cephalic bulb hooklets from the four rows are 39.3, 43.3, 44.2, and 47.3. larvae show an esophagus that represents 40 % o ... | 2013 | 23007726 |
| comparative landscape genetics of two river frog species occurring at different elevations on mount kilimanjaro. | estimating population connectivity and species' abilities to disperse across the landscape is crucial for understanding the long-term persistence of species in changing environments. surprisingly, few landscape genetic studies focused on tropical regions despite the alarming extinction rates within these ecosystems. here, we compared the influence of landscape features on the distribution of genetic variation of an afromontane frog, amietia wittei, with that of its more broadly distributed lowla ... | 2014 | 25230017 |
| treatment of argulus sp. infestation of river frogs. | ten river frog tadpoles (rana hecksheri) were collected from pointsett state park in south carolina in april 1995. they were housed together in a tank at the north carolina zoological park. although no skin lesions were evident at collection, skin scrapings performed 4 weeks later revealed numerous immature and adult argulus sp. on the tails and dorsal trunks of many of the tadpoles. the adult parasites were removed manually, and the tadpoles were treated with lufenuron (15 mg/l; program, novart ... | 2001 | 11703056 |
| the maluti mystery revisited: taxonomy of african river frogs (pyxicephalidae, amietia) on the drakensberg mountains in southern africa. | the taxonomy of two similar frogs from the top of the drakensberg escarpment, the maluti river frog and the phofung river frog is not settled. i examine the relevant types and type descriptions, and discover a number of errors in the literature. some of the recent taxonomic changes were found to be unsupported. the maluti river frog is assigned to amietia vertebralis (hewitt, 1927), and the phofung river frog to amietia hymenopus (boulenger, 1920). | 2015 | 25781744 |
| expanded geographical range, new host accounts, and observations of the nematode gyrinicola batrachiensis (oxyuroidea: pharyngodonidae) in tadpoles. | we describe the first account of the nematode gyrinicola batrachiensis in the gastrointestinal tracts of tadpoles of bufo terrestris, gastrophryne carolinensis, hyla femoralis, h. squirella, rana heckscheri, and r. utricularia. infection by g. batrachiensis was also noted in tadpoles of r. catesbeiana and r. clamitans, species previously described as harboring these nematodes. these observations represent a major expansion of the known geographical range of g. batrachiensis to include the southe ... | 2004 | 15040693 |
| peptidomic analysis of skin secretions from rana heckscheri and rana okaloosae provides insight into phylogenetic relationships among frogs of the aquarana species group. | the members of the aquarana (or rana catesbeiana species group) form a monophyletic group comprising seven species: r. catesbeiana, rana clamitans, rana grylio, rana virgatipes, rana septentrionalis, rana heckscheri and rana okaloosae. previous work has led to structural characterization of the antimicrobial peptides present in electrically-stimulated skin secretions from the first five species listed and this study presents the primary structures of orthologs from the river frog r. heckscheri a ... | 2007 | 17005262 |
| amphibiophilus mooiensis n. sp. (nematoda: amphibiophilidae), a parasite of amietia delalandii (duméril & bibron) (amphibia: pyxicephalidae) from south africa. | four species of the genus amphibiophilus skrjabin, 1916 from pyxycephalid frogs in southern and central africa are currently recognised as valid. several specimens of amphibiophilus were found in material from the common river frog, amietia delalandii (duméril & bibron) (amphibia: pyxicephalidae), collected in potchefstroom (north-west province, south africa). these specimens clearly differ from all previously known species by the shape of the distal end of the spicule, the shape of the gubernac ... | 0 | 29210016 |
| ultrastructural comparison of hepatozoon ixoxo and hepatozoon theileri (adeleorina: hepatozoidae), parasitising south african anurans. | to date, only two haemogregarine parasite species have been described from south african anurans: hepatozoon ixoxo, infecting toads of the genus sclerophrys (syn. amietophrynus); and hepatozoon theileri, parasitising the common river frog, amietia quecketti. both species have been characterised using limited morphology, and molecular data from pcr amplified fragments of the 18s rrna gene. however, no ultrastructural work has been performed thus far. the aim of this study was to add descriptive i ... | 2017 | 27480595 |
| evolutionary history of the river frog genus amietia (anura: pyxicephalidae) reveals extensive diversification in central african highlands. | the african river frog genus amietia is found near rivers and other lentic water sources throughout central, eastern, and southern africa. because the genus includes multiple morphologically conservative species, taxonomic studies of river frogs have been relatively limited. we sampled 79 individuals of amietia from multiple localities in and near the albertine rift (ar) of burundi, democratic republic of the congo, and uganda. we utilized single-gene (16s) and concatenated (12s, 16s, cyt b and ... | 2016 | 27026115 |
| effect of mercuric chloride on fertilization and larval development in the river frog, rana heckscheri (wright) (anura: ranidae). | | 1993 | 8400661 |
| ovarian effects of a sublethal concentration of mercuric chloride in the river frog, rana heckscheri (anura: ranidae). | | 1993 | 8428117 |
| molecular and morphological characterisation of rhabdias picardiae junker, lhermitte-vallarino et bain, 2010 (nematoda: rhabdiasidae) from delaland's river frog, amietia delalandii (duméril et bibron, 1841) (amphibia: pyxicephalidae) in south africa. | rhabdias picardiae previously known from the guttural toad, sclerophrys gutturalis (bufonidae) is described from a new host, delaland's river frog, amietia delalandii (pyxicephalidae). the species identification is confirmed by analysis of the coi gene sequence and morphological comparison with the original description. morphological details of apical structures in adult parasitic r. picardiae, namely, the shape and position of lips, the number and position of external labial papillae, and the b ... | 2018 | 29351077 |
| new records of amphibiophilus spp. (nematoda: amphibiophilidae) parasitic in strongylopus grayii (smith) and amietia delalandii (duméril & bibron) (amphibia: anura: pyxicephalidae) in south africa, with a description of amphibiophilus bialatus n. sp. | nematodes of the genus amphibiophilus skrjabin, 1916 are a small group of parasites restricted to pyxicephalid frogs in southern africa. in the present study, the new species a. bialatus parasitising the clicking stream frog strongylopus grayii (smith) as well as two forms parasitising the common river frog amietia delalandii (duméril & bibron) from two distant localities are described. amphibiophilus bialatus n. sp. clearly differs from the remaining species of the genus by having wide cervical ... | 2020 | 33145657 |
| the role of ambient temperature and body mass on body temperature, standard metabolic rate and evaporative water loss in southern african anurans of different habitat specialisation. | temperature and water availability are two of the most important variables affecting all aspects of an anuran's key physiological processes such as body temperature (tb), evaporative water loss (ewl) and standard metabolic rate (smr). since anurans display pronounced sexual dimorphism, evidence suggests that these processes are further influenced by other factors such as vapour pressure deficit (vpd), sex and body mass (mb). however, a limited number of studies have tested the generality of thes ... | 2019 | 31660269 |