| association of anurans with pathogenic fungi. | in a study of 450 amazonian anurans, we isolated yeasts and yeast-like fungi from 54 animals (bufo granulosus, b. marinus, dendrophrynyscus sp., hyla geographica, h. lanciformes, ololygon rubra, adenomera hylaedactyla, eleutherodactylus fenestratus, leptodactylus fuscus, l. ocellatus, l. pentadactylus). the internal organs of these animals did not show any macroscopic anomaly nor histopathology. we recovered 105 fungal isolates from the anuran liver, lung, kidney, spleen, heart and gonad. the is ... | 1985 | 4069190 |
| development of hepatozoon caimani (carini, 1909) pess a, de biasi & de souza, 1972 in the caiman caiman c. crocodilus, the frog rana catesbeiana and the mosquito culex fatigans. | the sporogony of hepatozoon caimani has been studied, by light microscopy, in the mosquito culex fatigans fed on specimens of the caiman caiman c. crocodilus showing gametocytes in their peripheral blood. sporonts iniciate development in the space between the epithelium of the insect gut and the elastic membrane covering the haemocoele surface of the stomach. sporulating oocysts are clustered on the gut, still invested by the gut surface membrane. fully mature oocysts were first seen 21 days aft ... | 2003 | 12700868 |
| first record of trypanosoma chattoni in brazil and occurrence of other trypanosoma species in brazilian frogs (anura, leptodactylidae). | the present study provides the first record of trypanosoma chattoni mathis and leger, 1911, in a new host, leptodactylus fuscus schneider, 1799 (anura, leptodactylidae), and the occurrence of trypanosoma rotatorium-like species in leptodactylus chaquensis cei, 1950. the anurans were captured in the state of mato grosso, brazil. blood samples were obtained by cardiac puncture, and blood smears were examined for the presence of hemoparasites. the trypanosoma rotatorium-like species in this study r ... | 2008 | 18372634 |
| frog skin cultures secrete anti-yellow fever compounds. | there is an urgent need to develop novel antimicrobial substances. antimicrobial peptides (amps) are considered as promising candidates for future therapeutic use. because of the re-emergence of the flavivirus infection, and particularly the yellow fever virus (yfv), we have compared the antiviral activities from skin secretions of seven different frog species against yfv (strain 17d). secretions from sphaenorhynchus lacteus, cryptobatrachus boulongeri and leptodactylus fuscus displayed the more ... | 2016 | 27049440 |
| anuran helminth communities from contrasting nature reserve and pasture sites in the pantanal wetland, brazil. | studies of amphibian macroparasites are relevant for the investigation of parasite community ecology and disease dynamics. here, the parasite communities of five anuran species (hypsiboas raniceps, phyllomeduza azurea, pseudis paradoxa, leptodactylus fuscus and leptodactylus podicipinus) are described from two habitats with different levels of preservation (pasture versus nature reserve). specifically, we used mixed-effect models to test whether helminth species richness, prevalence and abundanc ... | 2017 | 26907856 |
| the role of phytophysiognomies and seasonality on the structure of ground-dwelling anuran (amphibia) in the pampa biome, southern brazil. | considering that habitat use by amphibians is related both with climate and environmental features, we tested the hypothesis that anuran assemblages found in different phytophysiognomies and in different seasons vary in structure. additionally, we searched for species which can be indicators of habitat and seasons. the study was conducted in the pampa biome, southern brazil. sampling was done through pitfall traps placed in three phytophysiognomies: grassland, ecotone grassland/forest; and fores ... | 2013 | 23903564 |
| monitoring the morphological integrity of neotropical anurans. | amphibians are considered to be excellent bioindicators to their morphophysiological characteristics and life cycle. in this context, the present study investigated the morphological integrity of anuran larvae collected in preserved environments in the emas national park, in the municipality of mineiros (goiás state, brazil), and in environments representative of the agricultural matrix of the rio verde region, also in goiás, where there is a long history of the use of agricultural pesticides. s ... | 2019 | 30474816 |
| acoustic niche partitioning in an anuran community from the municipality of floriano, piauí, brazil. | vocalizations are an important trait for the identification of cryptic and/or closely related amphibian species. different vocalizations also contribute to partitioning of the acoustic space by sympatric species. this study aimed to describe the advertisement calls of anurans in a pond of the municipality of floriano, state of piauí, brazil, and infer the acoustic niche partitioning of amphibians. euclidean distance was used in a cluster analysis approach to infer the acoustic similarities among ... | 2019 | 30365635 |
| idiosyncratic liver pigment alterations of five frog species in response to contrasting land use patterns in the brazilian cerrado. | changes in land use trigger environmental changes that can lead to decreased biodiversity and species loss. the liver is an essential detoxification organ that reflects systemic physiological responses to environmental changes. here, we tested whether contrasting land use patterns influence the amount of substances from the hepatic cellular catabolism and melanomacrophages (mms) of five anuran species in the brazilian cerrado. | 2020 | 32913675 |
| atlantic amphibians: a data set of amphibian communities from the atlantic forests of south america. | amphibians are among the most threatened vertebrates in the world and this is also true for those inhabiting the atlantic forest hotspot, living in ecosystems that are highly degraded and threatened by anthropogenic activities. we present a data set containing information about amphibian communities sampled throughout the atlantic forest biome in south america. the data were extracted from 389 bibliographic references (articles, books, theses, and dissertations) representing inventories of amphi ... | 2018 | 29953585 |
| biological drivers of individual-based anuran-parasite networks under contrasting environmental conditions. | understanding the mechanisms driving host-parasite interactions has important ecological and epidemiological implications. traditionally, most studies dealing with host-parasite interaction networks have focused on species relationship patterns, and intra-population variation in such networks has been widely overlooked. in this study, we tested whether the composition of parasite communities of five anuran species (leptodactylus chaquensis, leptodactylus fuscus, leptodactylus podicipinus, pseudi ... | 2020 | 32578526 |
| effects of 2,4-d-based herbicide (dma® 806) on sensitivity, respiration rates, energy reserves and behavior of tadpoles. | increased use of sugarcane pesticides and their destination to non-target environments in brazil has generated concerns related to the conservation of more vulnerable groups, such as amphibians. besides the high skin permeability, tadpoles are constantly restricted to small and ephemeral ponds, where exposure to high concentrations of pesticides in agricultural areas is inevitable. this study evaluated chronic effects caused by sub-lethal concentrations of 2,4-dichlorophenoxyacetic acid herbicid ... | 2019 | 31323523 |
| a new frog of the leptodactylus fuscus species group (anura: leptodactylidae), endemic from the south american gran chaco. | a new species of leptodactylus frog (anura: leptodactylidae) from the south american gran chaco, morphologically similar and previously confused with the widespread leptodactylus mystacinus, is described through the use of multiple sources of evidence (molecular, external morphology, coloration, osteology, bioacoustics, and behavior). the phylogenetic analysis with partial sequences of mitochondrial rdna genes (12s and 16s) recovered the new species within the l. fuscus group, being highly diver ... | 2019 | 31616603 |
| effects of benzo[a]pyrene on the blood and liver of physalaemus cuvieri and leptodactylus fuscus (anura: leptodactylidae). | benzo[a]pyrene (bap) is a bio-accumulative toxic compound found in the atmosphere, water, and soil that may affect the life cycle of amphibians. in this study, a few contamination biomarkers, such as hepatic melanomacrophages (mms), mast cells, erythrocyte micronuclei (mn) and white blood cells were used to determine how bap acts in these cells in the anurans physalaemus cuvieri and leptodactylus fuscus. animals of both species were divided into three treatment groups: 1 day, 7 days and 13 days, ... | 2018 | 29477119 |
| contrasting life-histories in two syntopic amphibians of the leptodactylus fuscus group (heyer 1978). | we used skeletochronology to compare age, size, reproductive parameters and growth patterns of two related, anuran amphibians from northern argentina: leptodactylus bufonius (n=69) and l. latinasus (n=56), in order to better understand their coexistence in syntopy. previous studies showed that the two species overlap in their dietary requirements and utilize the same habitats for feeding and breeding. we found that their life-history patterns are significantly different, l. bufonius being larger ... | 2019 | 31365650 |
| effect of hydric stress on locomotion and morphology of tadpoles from temporary ponds. | many frog species reproduce in temporary ponds maintained exclusively by rainfall, thereby being exposed to drought and possibly mortality of eggs and tadpoles. some tadpoles, however, can survive for up to 5 days out of water but few data are available regarding the effects of dehydration on their development. the aim of this study was to evaluate whether hydric stress affects the locomotor capacity and the morphology in tadpoles of two leptodactylid frog species showing different reproductive ... | 2019 | 30592162 |
| larval cement gland of frogs: comparative development and morphology. | the cement gland (cg) is a transient mucus-secreting organ, found in most anuran embryos and early larvae and located normally on the anteroventral side of the head. its sticky secretion allows newly hatched larvae to attach to the egg jelly or to another support and remain hidden and stationary until feeding starts. analysis of cg morphology in 20 anuran species from six families using scanning electron microscopy revealed five distinct patterns of development, which partly related to families. ... | 2005 | 15672393 |
| does advertisement call variation coincide with genetic variation in the genetically diverse frog taxon currently known as leptodactylus fuscus (amphibia: leptodactylidae)? | the frog leptodactylus fuscus is found throughout much of south america in open and disturbed habitats. previous study of genetic differentiation in l. fuscus demonstrated that there was lack of genetic exchange among population units consistent with multiple species, rather than a single species. we examine advertisement vocalizations of l. fuscus to determine whether call variation coincides with genetic differentiation. calls were analyzed for 32 individual frogs from 25 localities throughout ... | 2003 | 12715049 |
| [changes in body fluids of the frog leptodactylus fuscus during estivation (anura, leptodactylidae)]. | the frog, l. fuscus, becomes dormant during the dry season in southeastern brazil. plasma and urine were obtained and analyzed for k+, na+, and osmotic concentrations in active and estivating frogs. soil water potential from the estivation sites was compared with the osmotic concentrations of the frog. plasma and urine osmotic concentrations (286.2 +/- 13.8 and 242.3 +/- 17.2 mosm1(-1), respectively) were higher in the estivating than in active frogs (240.3 +/- 12.8 and 112.7 +/- 15.6 mosm1(-1); ... | 1990 | 2089487 |