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The difference between the boundary layer and the skin resistance determines the total resistance of amphibians to evaporative water loss in amphibians. The use of agar models has become the industry standard for estimating rb under the assumption that the agar surface presents no obstacle to evaporation. Both the presence of solutes and agar concentration in water evaporation was affected by water evaporation. The most reliable and accurate way to determine rb was models made with agar at 5% concentration in water.
Source link: https://doi.org/10.1242/jeb.243941
However, our knowledge of localized transcript conservation is still limited to a few examples. Using the spatial expression technique TOMO-Seq, we wanted to compare localization profiles along the animal-vegetal axis of mature eggs from four vertebrate models, two amphibians, and two fishes. RNAs of several commonly used transcripts, germ plasm factors, and members of key signalling pathways are localized in entirely different ways among the models, according to We found that RNAs of several commonly used transcripts, germ layer determinants, germ plasm factors, and members of key signaling pathways are localized in completely different ways among the models.
Source link: https://doi.org/10.1016/j.ydbio.2022.06.013
We raised larval amphibians in 0, 1, or 10 bcg/L of the organophosphorus pesticide chlorpyrifos from hatching to metamorphosis to investigate how prolonged exposure to trace pesticide compounds affects vertebrate brain growth and behavior. Tadpoles exposed to 10 u03bcg/L CPF had altered behavioral responses to predator-associated olfactory cues, according to predator-associated olfactory cues. Also, we have solid evidence that trace, yet economically realistic, concentrations of CPF have neurodevelopmental and behavioral effects that persist to later life-history stages, undermining the potent effects of trace-levels of vertebrate growth.
Source link: https://doi.org/10.1021/acs.est.2c01039
These results have been less consistent in organisms with preserved sex-determining genes and highly differentiated sex chromosomes such as mammals, birds, and some insects, but they are less apparent in organisms where sex chromosomes vary and remain mostly homogenous, like amphibians. Given current evidence of sex chromosome evolution and speciation modes, we review the potential roles of sex-linked genes in isolating nascent lineages throughout the species spectrum and discuss their support in amphibians in this article. We hypothese that amphibian sex chromosomes are not expected to become supergenes of speciation, as shown by the rareness of empirical studies supporting a 'large sex chromosome effect' in frogs and toads, which is illustrated by the fact that sex chromosome effect in frogs and toads. Amphibians' diversity has a high likelihood to disentangle the evolutionary mechanisms responsible for the emergence of sex-linked speciation genes in other animals.
Source link: https://doi.org/10.1098/rstb.2021.0202
Aquatic oomycetes, also known as "water molds," are fungus-like microorganisms that are ubiquitous in freshwater ecosystems and are capable of causing disease in a variety of amphibian hosts. In this context, the main aim of the present review was to bring together existing data, assess current knowledge, and predict future directions in the saprobiosis-amphibian research field. In addition, the occurrence of saprobiosis in natural and laboratory settings, as well as the causes that influence both pathogen formation and host susceptibility are discussed. Due to the fact that this species is the most known species of amphibians, this research was devoted to its ecological importance on amphibian population dynamics and because of the fact that it is the most reported genera to be associated with saprogniosis in amphibians. niosis in amphibians.
Source link: https://doi.org/10.3390/jof8050537
Background: The destruction of habitats has harmed all Austrian amphibians. The development of spoil heaps and mine drainage waters contributes to habitat destruction in the development of habitat loss. Antimony mining in Stadtschlaining/Burgenland resulted in increased arsenic and antimony concentrations in soil and water. As and Sb's doses were increased, with up to 49,000 mg/kg As and 2446 mg/kg Sb in the soil. Larvae Salamandra were found throughout the creek, and survival rates were poor. Bombina variegata occurs occasionally.
Source link: https://doi.org/10.3390/ijerph19106010
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