| why do animals repeat displays? | both agonistic and sexual animal displays often involve more than one performance of some specific display action. since repetition is energetically costly there must be good reasons why a signaller should carry out such repetitive actions, rather than simply displaying once. we briefly review three different 'reasons' which arise from three different receiver assessment rules: when assessment is based on the average magnitude of all display actions so far, the reason for the repetition is to im ... | 1997 | 9268441 |
| effect of environmental temperatures on infection with mycobacterium marinum (balnei) of mice and a number of poikilothermic species. | clark, h fred (communicable disease center, atlanta, ga.), and charles c. shepard. effect of environmental temperatures on infection with mycobacterium marinum (balnei) of mice and a number of poikilothermic species. j. bacteriol. 86:1057-1069. 1963.-an exploration was made of the effect of environmental temperature on infections with mycobacterium marinum of mice, young opossums, and bats, and of 50 species of poikilothermic animals. in artificial medium (7h9 broth) m. marinum grew most rapidly ... | 1963 | 14080772 |
| a forty-three year museum study of northern cricket frog (acris crepitans) abnormalities in arkansas: upward trends and distributions. | the northern cricket frog (acris crepitans) is a resident of streams, rivers, and wetlands of eastern north america. we documented abnormalities in a. crepitans housed in the arkansas state university museum of zoology herpetology collection. abnormality frequency increased from 1957 to 2000 (chi 2 = 43.76, df = 3, p < 0.001). from 1957 through 1979 only 3.33% of specimens were unusual. this rate was 6.87% during the 1990s, and in 2000 it was 8.48%. high frequencies of abnormalities were identif ... | 2003 | 14567212 |
| blind location and separation of callers in a natural chorus using a microphone array. | male frogs and toads call in dense choruses to attract females. determining the vocal interactions and spatial distribution of the callers is important for understanding acoustic communication in such assemblies. it has so far proved difficult to simultaneously locate and recover the vocalizations of individual callers. here a microphone-array technique is developed for blindly locating callers using arrival-time delays at the microphones, estimating their steering-vectors, and recovering the ca ... | 2009 | 19640054 |
| wildlife toxicology: biomarkers of genotoxic exposures at a hazardous waste site. | a large number of hazardous waste sites in the united states have undergone the initial stages of remediation or containment. at many of the remaining sites, the potential for exposure to ecological receptors is a primary concern. this manuscript reports on studies to investigate the impact on ecological receptors exposed to complex mixtures at a former creosote facility. currently there are isolated areas on-site that were not addressed in the initial removal action that appear to be releasing ... | 2009 | 19533345 |
| species limits and phylogeography of north american cricket frogs (acris: hylidae). | cricket frogs are widely distributed across the eastern united states and two species, the northern cricket frog (acris crepitans) and the southern cricket frog (a. gryllus) are currently recognized. we generated a phylogenetic hypothesis for acris using fragments of nuclear and mitochondrial genes in separate and combined phylogenetic analyses. we also used distance methods and fixation indices to evaluate species limits within the genus and the validity of currently recognized subspecies of a. ... | 2008 | 18462953 |
| a new species of myxidium (myxosporea: myxidiidae), from the western chorus frog, pseudacris triseriata triseriata, and blanchard's cricket frog, acris crepitans blanchardi (hylidae), from eastern nebraska: morphology, phylogeny, and critical comments on amphibian myxidium taxonomy. | during march 2001-april 2004, 164 adult anurans of 6 species (47 rana blairi, 35 rana catesbeiana, 31 hyla chrysoscelis, 31 pseudacris triseriata triseriata, 11 bufo woodhousii, and 9 acris crepitans blanchardi) from pawnee lake, lancaster county, nebraska, were surveyed for myxozoan parasites. of these, 20 of 31 (65%) p. triseriata triseriata and 1 of 9 (11%) a. crepitans blanchardi were infected with a new species of myxidium. myxidium melleni n. sp. (myxosporea) is described from the gallblad ... | 2006 | 16884007 |
| thyroid endocrine disruption in stonerollers and cricket frogs from perchlorate-contaminated streams in east-central texas. | in october 2001 and march 2002, a field survey of central stonerollers (campostoma anomalum) from perchlorate-contaminated streams in central texas was conducted to assess thyroid endocrine disruption. a survey of adult male and female cricket frogs (acris crepitans) was performed at the same site between 2001 and 2003. perchlorate is an oxidizer primarily used in solid-fuel rockets, and many sites that processed or used perchlorate are now contaminated. histological analysis revealed that the f ... | 2006 | 16341611 |
| intersexuality and the cricket frog decline: historic and geographic trends. | exposure to anthropogenic endocrine disruptors has been listed as one of several potential causes of amphibian declines in recent years. we examined gonads of 814 cricket frogs (acris crepitans) collected in illinois and deposited in museum collections to elucidate relationships between the decline of this species in illinois and the spatial and temporal distribution of individuals with intersex gonads. compared with the preorganochlorine era studied (1852-1929), the percentage of intersex crick ... | 2005 | 15743712 |
| cricket frogs maintain body hydration and temperature near levels allowing maximum jump performance. | one goal of this study was to determine the combination of hydration and temperature in the northern cricket frog acris crepitans that allowed maximum jump distance in the laboratory. second, environmental variables in the field were measured to determine the best predictor(s) of mean body temperature and hydration and to determine whether frogs maintain levels of temperature and hydration yielding maximum jump distance. laboratory data revealed that hydration and the hydration-temperature inter ... | 2006 | 14988797 |
| forebrain arginine vasotocin correlates of alternative mating strategies in cricket frogs. | in cricket frogs, acris crepitans, sexually active males can switch between calling and noncalling (satellite) mating strategies and injections of the neuropeptide arginine vasotocin (avt) stimulate calling behavior. we report here that this behavioral variation of animals under field conditions is associated with variations in avt-immunoreactive (avt-ir) staining in distinct brain nuclei. in both calling and satellite males, one avt-ir brain region was found in a continuous string of cells betw ... | 1999 | 10433886 |
| temporal call changes and prior experience affect graded signalling in the cricket frog. | we investigated how male cricket frogs acris crepitans, alter their advertisement calls in response to broadcasts of synthetic calls that were either 'attractive' or 'aggressive'. the stimulus calls differed in temporal but not spectral characteristics. male cricket frogs produced a more aggressive call when presented with the aggressive stimulus, indicating that they perceived the temporal differences between the two call categories. the direction and degree of temporal and spectral changes dep ... | 1999 | 10196050 |
| the effects of arginine vasotocin on the calling behavior of male cricket frogs in changing social contexts. | we investigated the effects of the neurohypophysial peptide, arginine vasotocin (avt), on the calling behavior of male acris crepitans during and immediately following a simulated acoustic agonistic encounter. avt did not block the aggressive response to agonistic calls, as the changes in temporal call characteristics in response to the encounter were similar to those of saline-treated males. however, avt caused males to begin calling sooner during the agonistic encounter and to call significant ... | 1998 | 9878274 |
| forms and prevalence of intersexuality and effects of environmental contaminants on sexuality in cricket frogs (acris crepitans). | cricket frogs (acris crepitans) from several different sites in illinois were collected to assess the effects of environmental contamination on the prevalence of intersex gonads. of 341 frogs collected in 1993, 1994, and 1995, 2.7% were intersex individuals. there was no statistically significant relationship between the chemical compounds detected and cricket frog intersexuality. however, there was an association approaching significance (p = 0.07) between the detection of atrazine and intersex ... | 1998 | 9647894 |
| intraspecific variation in laryngeal and ear morphology in male cricket frogs (acris crepitans) | in a previous report, the authors found significant population variation in the calls of cricket frogs (acris crepitans) that could not be explained by geographic variation in body size alone. here we extend that work by investigating intraspecific population variation in the morphological characteristics underlying acoustic communication in male cricket frogs from several sites in texas. we measured the volumes of laryngeal and auditory components responsible for the generation or reception of ... | 1998 | 9480730 |
| correlations between call characteristics and morphology in male cricket frogs (acris crepitans). | we investigated the relationships among spectral and temporal advertisement-call characteristics and the sizes of the laryngeal and ear components thought to underlie the generation and reception of species-specific vocalizations in male cricket frogs (acris crepitans). we tested the predictions that the volumes of the structural elements necessary for acoustic communication would be correlated with various parameters of the vocalizations. the anatomy of laryngeal and ear structures was reconstr ... | 1996 | 8831143 |
| arginine vasotocin injection increases probability of calling in cricket frogs, but causes call changes characteristic of less aggressive males. | male cricket frogs, acris crepitans communicate to males and females using advertisement calls, which are arranged into call groups. calls at the middle and end, but not beginning of the call group, are modified in response to male-male aggressive interactions. we found in this field study of male cricket frogs in natural breeding choruses that the peptide hormone arginine vasotocin (avt) not only increased the probability that males called after injections, but also caused modifications in midd ... | 1995 | 8748513 |
| call patterns and basilar papilla tuning in cricket frogs. ii. intrapopulation variation and allometry. | we determined the influence of body size on the male advertisement call's dominant frequency and basilar papilla's (bp) tuning in male and female cricket frogs (acris crepitans) in two texas populations (wimberley and stengel ranch). in both populations, call and tuning characters correlated negatively with body size; females were larger than males and their bps were tuned to a lower frequency. analysis of covariance showed that neither the sex difference in tuning nor the population differences ... | 1992 | 1633555 |
| call patterns and basilar papilla tuning in cricket frogs. i. differences among populations and between sexes. | male cricket frogs (acris crepitans) produce a broad-band, high frequency advertisement call with a single spectral peak (the dominant frequency). we measured the dominant frequencies of male calls from six populations in central texas and one from indiana and compared them to the tuning of basilar papilla afferents in males and females. averaging over all populations, mean call dominant frequency was 3.69 khz, mean male basilar papilla tuning was 3.63 khz, and mean female basilar papilla tuning ... | 1992 | 1633554 |
| a comparison of energy substrates and reproductive patterns of two anurans. acris crepitans and bufo woodhousei. | the seasonal pattern of carcass, liver and ovary lipid and liver non-lipid mass was examined in the cricket frog, acris crepitans, and woodhouse's toad, bufo woodhousei. reproductive patterns were also studied. the over-winter reduction of body lipid and liver non-lipid material was attributed to metabolism in acris crepitans. male, but not female, bufo woodhousei exhibited seasonal variation in lipid stores that was attributable to metabolism. females, but not males, showed seasonal variation i ... | 1987 | 2886261 |
| parathion accumulation in cricket frogs and its effect on american kestrels. | adult cricket frogs (acris crepitans) were held individually for 96 h in static systems containing initial concentrations of either 0, 0.1, 1.0, or 10 ppm parathion in 10 ml water. mortality of cricket frogs was directly related to the parathion concentration in the water. frogs from the 1.0- and 10-ppm groups accumulated 0.08 and 4.6 ppm parathion, respectively. one of four american kestrels (falco sparverius) fed frogs from the 10-ppm group died from organophosphate poisoning less than 3 h aft ... | 1982 | 7161839 |
| latitudinal effects on metabolic rates in the cricket frog, acris crepitans: acutely measured rates in summer frogs. | | 1972 | 4637906 |
| geographic variation of lactate dehydrogenase in the cricket frog, acris crepitans. | | 1969 | 5365509 |
| sun compass orientation of the northern cricket frog, acris crepitans. | | 1967 | 6031109 |
| terrestrial exposure and effects of headline amp(®) fungicide on amphibians. | recent studies have demonstrated that a pyraclostrobin-containing fungicide (headline(®) fungicide--headline(®) fungicide and headline amp(®) fungicide are registered trademarks of basf) is toxic to amphibians at environmentally relevant concentrations. however, these studies were performed in a laboratory setting of a worst-case direct exposure in clean media. interception of spray by the crop canopy and ground cover used by animals for security cover will influence exposure. thus, risk to amph ... | 2015 | 26088505 |
| elevated temperature as a treatment for batrachochytrium dendrobatidis infection in captive frogs. | the amphibian chytrid fungus batrachochytrium dendrobatidis (bd) has been implicated in amphibian declines worldwide. in vitro laboratory studies and those done on wild populations indicate that bd grows best at cool temperatures between 17 and 25 degrees c. in the present study, we tested whether moderately elevating the ambient temperature to 30 degrees c could be an effective treatment for frogs infected with bd. we acquired 35 bullfrogs rana catesbeiana from breeding facilities and 36 northe ... | 2011 | 21790070 |
| impacts of the herbicide butachlor on the larvae of a paddy field breeding frog (fejervarya limnocharis) in subtropical taiwan. | butachlor is the most commonly used herbicide on paddy fields in taiwan and throughout southeast asia. since paddy fields provide habitat for pond breeding amphibians, we examined growth, development, time to metamorphosis, and survival of alpine cricket frog tadpoles (fejervarya limnocharis) exposed to environmentally realistic concentrations of butachlor. we documented negative impacts of butachlor on survival, development, and time to metamorphosis, but not on tadpole growth. the 96 h lc(50) ... | 2011 | 21210217 |
| malathion-induced sublethal toxicity on the hematology of cricket frog (fejervarya limnocharis). | the effect of malathion [diethyl(dimethoxythiophosphorylthio)succinate] at sublethal concentration (0.006 ppm) on hematological parameters of the cricket frog (fejervarya limnocharis) was studied for 24 hrs to 240 hrs of exposure and remarkable hematological alterations were observed. the study on hematological parameters revealed a highly significant decrease (p < 0.01) in the total erythrocytes count in malathion-exposed animals from 24 hours to 96 hrs of exposure as compared to control. signi ... | 2009 | 20183077 |
| intermediate pond sizes contain the highest density, richness, and diversity of pond-breeding amphibians. | we present data on amphibian density, species richness, and diversity from a 7140-ha area consisting of 200 ponds in the midwestern u.s. that represents most of the possible lentic aquatic breeding habitats common in this region. our study includes all possible breeding sites with natural and anthropogenic disturbance processes that can be missing from studies where sampling intensity is low, sample area is small, or partial disturbance gradients are sampled. we tested whether pond area was a si ... | 2015 | 25906355 |
| malathion-induced sublethal toxicity on the intestine of cricket frog (fejervarya limnocharis). | the effect of malathion [diethyl(dimethoxythiophosphorylthio)succinate] at sublethal concentration (0.006 ppm) on intestinal parameters of cricket frog (fejervarya limnocharis) was studied for 24 hrs to 240 hrs of exposure and remarkable histopathological alterations were observed. the study on intestinal parameters revealed acute pathological conditions in the intestinal wall. the toxic effect became evident as the cytoplasm of the cells disintegrated and the cells became empty and vacuolated. ... | 2011 | 21864141 |
| the influence of temperature on chytridiomycosis in vivo. | chytridiomycosis, an amphibian disease caused by the fungal pathogen batrachochytrium dendrobatidis (bd), is an ideal system for studying the influence of temperature on host-pathogen relationships because both host and pathogen are ectothermic. studies of bd in culture suggest that optimal growth occurs between 17 and 23°c, and death of the fungus occurs above 29 or below 0°c. amphibian immune systems, however, are also temperature dependent and often more effective at higher temperatures. we t ... | 2017 | 28879516 |
| pesticide alters habitat selection and aquatic community composition. | anthropogenic chemical contamination is an important issue for conservation of aquatic ecosystems. while recent research highlights that community context can mediate the consequences of contaminant exposure, little is known about how contaminants themselves might determine this context by altering habitat selection and thus initial community composition. here we show that the insecticide carbaryl and its commercial counterpart sevin can affect aquatic community composition by differentially alt ... | 2009 | 19252931 |
| effects of combinations of malathion and cypermethrin on survivability and time of metamorphosis of tadpoles of indian cricket frog (fejervarya limnocharis). | this study was undertaken to determine the effect of environmentally realistic concentrations of two commonly used pesticides viz., malathion and cypermethrin, using a fully 3 × 3 factorial experiments on the survivability and time of metamorphosis in a common rice paddy field frog (cricket frog) fejervarya limnocharis under laboratory conditions. the results suggest that cypermethrin is more toxic than malathion and combinations of higher concentrations of cypermethrin (50 μg/l) with malathion ... | 2012 | 22251205 |
| sodium arsenite induced changes in survival, growth, metamorphosis and genotoxicity in the indian cricket frog (rana limnocharis). | arsenic contamination of the environment is a matter of great concern. understanding the effects of arsenic on aquatic life will act as biological early warning system to assess how arsenic could shape the biodiversity in the affected areas. rapid decline in amphibian population in recent decades is a cause of major concern. over the years, amphibians have been recognized as excellent bio-indicators of environmental related stress. in the present study, we examined the toxic and genotoxic effect ... | 2014 | 25048924 |
| effects of terrestrial buffer zones on amphibians on golf courses. | a major cause of amphibian declines worldwide is habitat destruction or alteration. public green spaces, such as golf courses and parks, could serve as safe havens to curb the effects of habitat loss if managed in ways to bolster local amphibian communities. we reared larval blanchard's cricket frogs (acris blanchardi) and green frogs (rana clamitans) in golf course ponds with and without 1 m terrestrial buffer zones, and released marked cricket frog metamorphs at the golf course ponds they were ... | 2012 | 22761833 |
| the role of environmental selection in intraspecific divergence of mate recognition signals in the cricket frog, acris crepitans. | | 1990 | 28567808 |
| atrazine feminizes sex ratio in blanchard's cricket frogs (acris blanchardi) at concentrations as low as 0.1 μg/l. | we exposed blanchard's cricket frogs (acris blanchardi) to ecologically relevant concentrations (0, 0.1, 1, and 10 μg/l) of a commercial formulation of atrazine throughout the larval period to determine effects on survival, somatic growth and development (time to metamorphosis and mass at metamorphosis), and gonadal development (sex ratio at metamorphosis and the prevalence of testicular ova in phenotypic males). we tested the following hypotheses: 1) atrazine feminizes the sex ratio, 2) atrazin ... | 2018 | 29028124 |
| short-term atrazine exposure at breeding has no impact on blanchard's cricket frog (acris blanchardi) reproductive success. | studies of endocrine-disrupting contaminants have focused on early-life exposures, but later exposures could impact fitness. we exposed adult frogs (acris blanchardi) at reproduction to ecologically relevant atrazine concentrations (0, 1, or 10 µg/l) in outdoor arenas. we measured likelihood of breeding and number of resulting tadpoles. atrazine impacted neither the probability of breeding nor the number of tadpoles produced, suggesting anuran reproductive success may not be impacted by short-te ... | 2017 | 28657116 |
| variation in malathion sensitivity among populations of blanchard's cricket frogs (acris blanchardi) and implications for risk assessment. | intraspecific variability in contaminant sensitivity could undermine risk assessments for nontarget organisms such as amphibians. to test how amphibian populations vary in tolerance to anticipated lethal and sublethal exposures to a pesticide, we exposed blanchard's cricket frogs (acris blanchardi) from 3 populations across a broad portion of their range to the insecticide malathion. exposure in mesocosms to a nominal concentration of 1 mg/l (measured concentrations at 1 h and 24 h postaddition ... | 2017 | 27982495 |
| acute toxicity of headline® fungicide to blanchard's cricket frogs (acris blanchardi). | previous laboratory studies have suggested that pyraclostrobin-containing fungicide formulations are toxic to amphibians at environmentally relevant concentrations. however, it is unknown if all pyraclostrobin formulations have similar toxicity and if toxicity occurs in different amphibian species. we investigated the acute toxicity of two formulations, headline(®) fungicide and headline amp(®) fungicide, to blanchard's cricket frogs (acris blanchardi) based on a direct overspray scenario. in ad ... | 2016 | 26707241 |
| extraoptic celestial orientation in the southern cricket frog acris gryllus. | celestial orientation and setting of the biological clock in the southern cricket frog acris gryllus can be cued by light stimuli received by extraoptic receptors in the brain. these extraoptic photoreceptors may also be used in learning new orientational directions. a mechanism for a light-activated biological clock is discussed. | 1970 | 5435900 |
| a preliminary investigation of color discrimination in the florida cricket frog. acris gryllus dorsalis (harlan). | | 1948 | 18901919 |
| temperature-dependent effects of cutaneous bacteria on a frog's tolerance of fungal infection. | defense against pathogens is one of many benefits that bacteria provide to animal hosts. a clearer understanding of how changes in the environment affect the interactions between animals and their microbial benefactors is needed in order to predict the impact and dynamics of emerging animal diseases. due to its dramatic effects on the physiology of animals and their pathogens, temperature may be a key variable modulating the level of protection that beneficial bacteria provide to their animal ho ... | 2018 | 29563909 |
| responses of male cricket frogs (acris crepitans) to attenuated and degraded advertisement calls. | we examined the vocal and non-vocal responses of male cricket frogs (acris crepitans) to conspecific advertisement calls that had been attenuated or degraded by reducing the depth of amplitude modulation (am). both are characteristic of changes to the call as it is transmitted through natural habitats. as stimulus calls became more intense or less degraded, male cricket frogs gradually decreased their call rate and increased the number of call groups and pulse groups in their calls, changes indi ... | 2017 | 28966421 |
| metal concentrations of tadpoles in experimental ponds. | anuran tadpoles are found in a variety of habitats, many of which are acidified or have high ambient concentrations of metals from anthropogenic sources. a few studies that have been conducted on metals in tadpoles demonstrate that they can contain high concentrations of some metals but have not demonstrated clear relationships between ambient conditions and metal concentrations. this study examines the influence of soil, water treatment, amphibian species, and body portion analyzed on metal con ... | 1996 | 15091435 |
| a new species of frog (anura: dicroglossidae) discovered from the mega city of dhaka. | we describe a new species of frog of the genus zakerana discovered from the urban core of dhaka, bangladesh, one of the most densely populated cities in the world. although the new species is morphologically similar to the geographically proximate congeners in the bangladeshi cricket frog group, we show that it can be distinguished from all congeners on the basis of morphological characters, advertisement calls and variation in two mitochondrial dna genes (12s rrna and 16s rrna). apart from seve ... | 2016 | 26934699 |
| move it or lose it: interspecific variation in risk response of pond-breeding anurans. | changes in behavior are often the proximate response of animals to human disturbance, with variability in tolerance levels leading some species to exhibit striking shifts in life history, fitness, and/or survival. thus, elucidating the effects of disturbance on animal behavior, and how this varies among taxonomically similar species with inherently different behaviors and life histories is of value for management and conservation. we evaluated the risk response of three anuran species-southern l ... | 2019 | 31211010 |
| phenotypic divergence in large sized cricket frog species that crossed the geographical barriers within peninsular india. | a good number of new species are being described and included in the genus fejervarya / minervarya from south asia and southeast asia in the recent past. but, the classification or consideration of the genus fejervarya / minervarya is only phylogenetic, where it is difficult to morphologically identify the genus in the overlapping range of geographical distribution. recently a large sized new species of cricket frog fejervarya kalinga has been described, which is thought to be endemic to the eas ... | 2020 | 33056822 |
| extension in distribution of raorchestes parvulus (boulenger, 1893) (anura: rhacophoridae) to china. | we record raorchestes parvulus (boulenger, 1893) for the first time from china based on six specimens collected from southern yunnan. phylogenetically these individuals were placed in a clade with r. parvulus from southeast asia and pairwise genetic distances in dna sequences of the mitochondrial 16s rrna gene ranged from 0 to 3.1% within the clade. morphologically these specimens agree with r. parvulus in a series of characters including body size small, a large external vocal sac, vomerine tee ... | 2019 | 31715729 |
| individual and combined effects of organophosphate and carbamate pesticides on the cricket frog fejervarya limnocharis. | many amphibians use water bodies associated with agro-ecosystem for breeding and thus are exposed to multiple chemicals. fejervarya limnocharis is a common frog occurring in rice paddy fields. the timings of pesticide application generally coincide with the tenure of the occurrence of tadpoles in shallow waters of paddy fields. malathion and carbaryl are frequently used in rice paddy fields to control leafhoppers and rice bugs, respectively. therefore, effects of mixtures of malathion and carbar ... | 2020 | 31520318 |
| does sexual dimorphism vary by population? laryngeal and ear anatomy in cricket frogs. | acoustic communication in many anuran species can show the effects of both natural and sexual selection. this is reflected in the sexually dimorphic anatomy of the larynx and ear structures, as well as the allometric relationship of these morphological traits to head or body size. in this study, we examined laryngeal and ear structures of cricket frogs acris crepitans not only as sexually dimorphic characteristics, but also as they differ across populations in environmentally different habitats. ... | 2019 | 31263493 |
| fungal infection has sublethal effects in a lowland subtropical amphibian population. | the amphibian chytrid fungus, batrachochytrium dendrobatidis (bd), has been implicated as a primary cause of decline in many species around the globe. however, there are some species and populations that are known to become infected in the wild, yet declines have not been observed. here we conducted a yearlong capture-mark-recapture study and a 2-year long disease monitoring study of northern cricket frogs, acris crepitans, in the lowland subtropical forests of louisiana. | 2018 | 30217158 |
| an amphibian with a contracting range is not more vulnerable to pesticides in outdoor experimental communities than common species. | in areas with heavy pesticide use, it is easy to attribute population declines to environmental contamination. the blanchard's cricket frogs (acris blanchardi) is an amphibian experiencing declines and range contractions across its distribution in the midwest corn belt (usa). experimental studies suggest that cricket frogs are sensitive to pesticides, but there are few studies examining this species' susceptibility to contaminants in realistic environments or comparing relative impacts with othe ... | 2018 | 30035389 |
| urbanization interferes with the use of amphibians as indicators of ecological integrity of wetlands. | 1. wetlands are ecologically and economically important ecosystems but are threatened globally by many forms of human disturbance. understanding the responses of wetland species to human disturbance is essential for effective wetland management and conservation. 2. we undertook a study to determine (i) whether anurans can be used effectively to assess the ecological integrity of wetlands affected by groundwater withdrawal and, if so, (ii) what effect increasing urbanization might have on the uti ... | 2012 | 32367892 |
| effect of malathion on survival, growth, and food consumption of indian cricket frog (limnonectus limnocharis) tadpoles. | the effects of short-term exposure (28 days) of free-feeding limnonectus limnocharis (indian cricket frog) tadpoles to field concentrations of malathion were investigated. this frog species is a major biotic component of the agroecosystems of the western ghats (13 degrees 18', 75 degrees 25' and 13 degrees 22', 75 degrees 28'), where malathion (diethyl [(dimethoxy phosphino thioyl] butanediote), an organophosphate pesticide, is being used extensively. although malathion is known to cause nonreve ... | 2007 | 17160490 |
| coevolution of sender and receiver: effect on local mate preferecnce in cricket frogs. | mate recognition in frogs requires congruence of call characters, such as dominant frequency, and properties ofthe auditory system, such as frequency sensitivity of inner ear organs. two neighboring populations of cricket frogs (acri crepitans) exhibit statistically significant differences in the dominant frequency of the advertisement call and the frequency to which the basilar papilla of the inner ear is most sensitive. call frequency and frequency sensitivity are matched within but differ bet ... | 1988 | 17842431 |
| polymorphism in cricket frogs: an hypothesis. | | 1974 | 28564843 |
| encoding of geographic dialects in the auditory system of the cricket frog. | the frequency sensitivity of the auditory nervous system of cricket frogs (acris) varies geographically. this variation is closely matched to the spectral energy in their mating calls, thus enabling them to respond preferentially to the calls of their local dialect. | 1973 | 17811321 |
| adaptive color polymorphism in cricket frogs. | | 1973 | 28564921 |
| geographic variation of blood and liver proteins in cricket frogs. | | 1969 | 5364925 |
| lethal and sublethal amphibian host responses to batrachochytrium dendrobatidis exposure are determined by the additive influence of host resource availability. | host species may differ in their responses to pathogen exposures based on host energy reserves, which could be important for long-term trends in host population growth. batrachochytrium dendrobatidis (bd) is a pathogen associated with amphibian population declines but also occurs without causing mass mortalities. the impact of bd in populations without associated declines is not well understood, and food abundance could play a role in determining the magnitude of its effects. we exposed american ... | 2020 | 31769713 |
| amphibian monitoring in hardwood forests: optimizing methods for contaminant-based compensatory restorations. | amphibians such as frogs, toads, and salamanders provide important services in aquatic and terrestrial ecosystems and have been proposed as useful indicators of progress and success for ecological restoration projects. limited guidance is available, however, on the costs and benefits of different amphibian monitoring techniques that might be applied to sites restored in compensation for contaminant injury. we used a variety of methods to document the amphibian communities present at 4 restored b ... | 2019 | 31379053 |
| seasonality in batrachochytrium dendrobatidis detection in amphibians in central oklahoma, usa. | chytridiomycosis, an infectious disease caused by the fungus batrachochytrium dendrobatidis (chytrid or bd), has not been well studied in oklahoma. this is of particular concern regarding the connection between seasonality and chytrid infection. to further investigate this connection, chytrid prevalence and infection load were quantified within amphibians in central oklahoma from march to october, across two sites in oklahoma co. and two sites in cleveland co. the results show a trend between se ... | 2019 | 31260222 |