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https://www.readbyqxmd.com/read/28226256/endocrine-and-cellular-stress-effects-of-zinc-oxide-nanoparticles-and-nifedipine-in-marsh-frogs-pelophylax-ridibundus
#1
Halina Falfushynska, Lesya Gnatyshyna, Oksana Horyn, Inna Sokolova, Oksana Stoliar
Freshwater organisms including amphibians experience increasing exposures to emerging pollutants such as nanoparticles and pharmaceuticals, which can affect their fitness and performance. We studied the effects of two common pollutants extensively used in industry, pharmaceutical and personal care products, nano-zinc oxide (nZnO) and a Ca-channel blocker nifedipine (Nfd), on endocrine status and cellular stress markers of the marsh frog Pelophylax ridibundus. Males were exposed for 14days to nZnO (3.1μM), Zn(2+) (3...
February 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28222925/linking-national-wood-consumption-with-global-biodiversity-and-ecosystem-service-losses
#2
Abhishek Chaudhary, L Roman Carrasco, Thomas Kastner
Identifying the global hotspots of forestry driven species, ecosystem services losses and informing the consuming nations of their environmental footprint domestically and abroad is essential to design demand side interventions and induce sustainable production methods. Here we first use countryside species area relationship model to project species extinctions of four vertebrate taxa (mammals, birds, amphibians and reptiles) due to forest land use in 174 countries. We combine the projected extinctions with a global database on the monetary value of ecosystem services provided by different biomes and with bilateral trade data of wood products to calculate species extinctions and ecosystem services losses inflicted by national wood consumption and international wood trade...
February 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28222719/descriptive-study-of-enteric-zoonoses-in-ontario-canada-from-2010-2012
#3
Yvonne Whitfield, Karen Johnson, Leigh Hobbs, Dean Middleton, Badal Dhar, Linda Vrbova
BACKGROUND: Contact with animals and their environment has long been recognized as an important source of enteric zoonoses. However, there are limited data available on the burden of illness associated with specific types of animals in Canada. This study describes the overall burden of enteric zoonoses in Ontario, Canada from 2010 to 2012. METHODS: Confirmed cases of seven enteric zoonotic diseases (campylobacteriosis, cryptosporidiosis, giardiasis, listeriosis, salmonellosis, verotoxin-producing E...
February 21, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28215683/effects-of-hormonal-stimulation-on-the-concentration-and-quality-of-excreted-spermatozoa-in-the-critically-endangered-panamanian-golden-frog-atelopus-zeteki
#4
Gina Della Togna, Vance L Trudeau, Brian Gratwicke, Matthew Evans, Lauren Augustine, Han Chia, Edward J Bronikowski, James B Murphy, Pierre Comizzoli
Knowledge of basic gamete biology is critical to better protect and propagate endangered amphibian species and also to develop reproductive technologies combined with germplasm cryopreservation. The objectives of the study were to test different hormonal stimulations and then characterize the quantity and quality of Panamanian golden frog (Atelopus zeteki) spermatozoa. Following intraperitoneal injection of the gonadotropin-releasing hormone agonist (des-Gly(10), D-Ala(6), Pro-NHEt(9-)-GnRH 1, 2 or 4 μg/g of body weight), human chorionic gonadotropin (hCG; 5 or 10 IU/gbw), or Amphiplex™ (0...
March 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/28213545/antifungal-bacteria-on-woodland-salamander-skin-exhibit-high-taxonomic-diversity-and-geographic-variability
#5
Carly R Muletz-Wolz, Graziella V DiRenzo, Stephanie A Yarwood, Evan H Campbell Grant, Robert C Fleischer, Karen R Lips
Diverse bacteria inhabit amphibian skin, some of which inhibit growth of the fungal pathogen, Batrachochytrium dendrobatidis (Bd). Yet, there has been no systematic survey of anti-Bd bacteria across localities, species and elevations. This is important given geographic and taxonomic variation in amphibian susceptibility to Bd. Our sites were within the Appalachian Mountains where previous sampling indicated low Bd prevalence. We determined the number and identity of anti-Bd bacteria on 61 Plethodon salamanders (37 P...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28213302/disrupting-effects-of-azocyclotin-to-the-hypothalamo-pituitary-gonadal-axis-and-reproduction-of-xenopus-laevis
#6
Shuying Li, Meng Li, Wenjun Gui, Qiangwei Wang, Guonian Zhu
Over the past few decades, the hazards associated with the extensive use of organictin compounds have become an issue of extreme concern, while at present the effects of these substances on amphibians remain poorly understood. In the present study, we chose azocyclotin, one of common use acaricides in China. We focused on sexual development and steroidogenesis disrupting effects of azocyclotin in the Xenopus laevis. Tadpoles were exposed to azocyclotin (0.05 and 0.5μg/L) for long-term (4 months) study. Results showed that exposure to azocyclotin caused developmental toxicity, including decreased survival, body weight, body length, gonadosomatic index, hepatosomatic index and female phenotype...
February 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28208115/effects-of-%C3%AE-cypermethrin-enantiomers-on-the-growth-biochemical-parameters-and-bioaccumulation-in-rana-nigromaculata-tadpoles-of-the-anuran-amphibians
#7
Peng Xu, Ledan Huang
Populations of many amphibian species are declining worldwide in part because of pesticide contamination. As a surface water contaminant, α-cypermethrin may have severe ecological impacts on amphibians. Here, we examined the acute toxicity of α-cypermethrin enantiomers to dark-spotted frog Rana nigromaculata tadpoles at 24, 48, 72 and 96h, finding that the tadpoles were indeed sensitive to α-cypermethrin. The (S)-(1R, 3R)-enantiomer was approximately 29 times more toxic than the (R)-(1S, 3S)-enantiomer at 96h...
February 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28202808/a-broad-scale-comparison-of-aerobic-activity-levels-in-vertebrates-endotherms-versus-ectotherms
#8
James F Gillooly, Juan Pablo Gomez, Evgeny V Mavrodiev
Differences in the limits and range of aerobic activity levels between endotherms and ectotherms remain poorly understood, though such differences help explain basic differences in species' lifestyles (e.g. movement patterns, feeding modes, and interaction rates). We compare the limits and range of aerobic activity in endotherms (birds and mammals) and ectotherms (fishes, reptiles, and amphibians) by evaluating the body mass-dependence of VO2 max, aerobic scope, and heart mass in a phylogenetic context based on a newly constructed vertebrate supertree...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28198035/testing-the-effect-of-dietary-carotenoids-on-larval-survival-growth-and-development-in-the-critically-endangered-southern-corroboree-frog
#9
Phillip G Byrne, Aimee J Silla
The success of captive breeding programs (CBPs) for threatened species is often limited due to a lack of knowledge of the nutritional conditions required for optimal growth and survival. Carotenoids are powerful antioxidants known to accelerate vertebrate growth and reduce mortality. However, the effect of carotenoids on amphibian life-history traits remains poorly understood. The aim of our study was to use a manipulative laboratory experiment to test the effect of dietary-carotenoid supplementation during the larval life stage on the survival, growth and development of the critically endangered southern corroboree frog (Pseudophryne corroboree)...
February 15, 2017: Zoo Biology
https://www.readbyqxmd.com/read/28195641/clinical-pathology-of-amphibians-a-review
#10
REVIEW
María J Forzán, Jill Heatley, Karen E Russell, Barbara Horney
Amphibian declines and extinctions have worsened in the last 2 decades. Partly because one of the main causes of the declines is infectious disease, veterinary professionals have increasingly become involved in amphibian research, captive husbandry, and management. Health evaluation of amphibians, free-living or captive, can benefit from employing the tools of clinical pathology, something that is commonly used in veterinary medicine of other vertebrates. The present review compiles what is known of amphibian clinical pathology emphasizing knowledge that may assist with the interpretation of laboratory results, provides diagnostic recommendations for common amphibian diseases, and includes RIs for a few amphibian species estimated based on peer-reviewed studies...
February 13, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28193811/the-dual-rod-system-of-amphibians-supports-colour-discrimination-at-the-absolute-visual-threshold
#11
Carola A M Yovanovich, Sanna M Koskela, Noora Nevala, Sergei L Kondrashev, Almut Kelber, Kristian Donner
The presence of two spectrally different kinds of rod photoreceptors in amphibians has been hypothesized to enable purely rod-based colour vision at very low light levels. The hypothesis has never been properly tested, so we performed three behavioural experiments at different light intensities with toads (Bufo) and frogs (Rana) to determine the thresholds for colour discrimination. The thresholds of toads were different in mate choice and prey-catching tasks, suggesting that the differential sensitivities of different spectral cone types as well as task-specific factors set limits for the use of colour in these behavioural contexts...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28193448/cryopreservation-of-bufotes-viridis-embryos-by-vitrification
#12
Zahra Derakhshan, Mohsen Nokhbatolfoghahai, Shahla Zahiri
Loss of biodiversity among amphibians is a current concern. Our hypothesis is that the embryos of amphibian species at risk of extinction could be cryopreserved by vitrification, using methods which have proved successful with fish oocyte. To test this hypothesis, samples of four cryoprotectants - methanol (MeOH), dimethyl sulphoxide (Me2SO), propylene glycol (PG) and polyethylene glycol (PEG), some singly, some in combination, were plunged in liquid nitrogen for 5 min to find the best solution for vitrification...
February 11, 2017: Cryobiology
https://www.readbyqxmd.com/read/28190921/lethal-and-sublethal-effects-of-a-methomyl-based-insecticide-in-hoplobatrachus-rugulosus
#13
Waret Trachantong, Supap Saenphet, Kanokporn Saenphet, Monruedee Chaiyapo
The aim of this study was to investigate the lethal and sublethal toxicity of a methomyl-based insecticide in Hoplobatrachus rugulosus, as methomyl-based insecticides are applied in massive amounts and agrochemicals have effects on the decline in amphibian populations. To evaluate the toxic effects of methomyl from agricultural application, a methomyl-based insecticide containing 40% methomyl was selected. The median lethal concentration of 96 hours of methomyl exposure was 8.69 ppm for H. rugulosus tadpoles...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28187641/cryptic-within-cryptic-genetics-morphometrics-and-bioacoustics-delimitate%C3%A2-a-new-species-of-i-eleutherodactylus-i-anura-eleutherodactylidae-from-eastern-cuba
#14
Ariel Rodríguez, Álvaro Dugo-Cota, Santiago Montero-Mendieta, Alejandro Gonzalez-Voyer, Roberto Alonso Bosch, Miguel Vences, Carles Vilà
We studied the variation in genetics, bioacustics, and morphology in Eleutherodactylus glamyrus, a regionally endemic frog species restricted to high elevations in the Sierra Maestra Massif, Western Cuba that was originally described as a cryptic species hidden under the name E. auriculatus. Genetic analysis of mtDNA sequences of the 16S and cob genes identify two allopatric and strongly supported mitochondrial clades (phylogroups) which also showed no haplotype sharing in the nuclear Rag-1 gene. Bioacustic, and morphological comparisons concordantly identify these two phylogroups as independent evolutionary lineages...
January 20, 2017: Zootaxa
https://www.readbyqxmd.com/read/28186382/vulnerability-of-european-freshwater-catchments-to-climate-change
#15
Danijela Markovic, Savrina F Carrizo, Oskar Kärcher, Ariane Walz, Jonathan N W David
Climate change is expected to exacerbate the current threats to freshwater ecosystems, yet multifaceted studies on the potential impacts of climate change on freshwater biodiversity at scales that inform management planning are lacking. The aim of this study is to fill this void through the development of a novel framework for assessing climate change vulnerability tailored to freshwater ecosystems. The three dimensions of climate change vulnerability are: 1) exposure to climate change; 2) sensitivity to altered environmental conditions; and 3) resilience potential...
February 10, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28183129/the-type-localities-of-i-anolis-i-i-aequatorialis-i-werner-1894-sauria-iguania-dactyloidae-and-i-pristimantis-i-i-appendiculatus-i-werner-1894-amphibia-anura-craugastoridae
#16
Diego F Cisneros-Heredia
The eminent Austrian zoologist Franz Werner described several new species of amphibians and reptiles from America, including Anolis aequatorialis Werner, 1894 and Hylodes appendiculatus Werner, 1894. Both species were described based on single specimens, with no more specific type localities than "Ecuador" (Werner 1894a,b). After its description, A. aequatorialis remained unreported until Peters (1967) and Fitch et al. (1976) published information on its distribution and natural history. Anolis aequatorialis is currently known to inhabit low montane and cloud forest on the western slopes of the Andes from extreme southern Colombia to central Ecuador, between 1300 and 2300 m elevation (Ayala-Varela & Velasco 2010; Ayala-Varela et al...
January 4, 2017: Zootaxa
https://www.readbyqxmd.com/read/28182738/tropical-anurans-mature-early-and-die-young-evidence-from-eight-afromontane-hyperolius-species-and-a-meta-analysis
#17
Ulrich Sinsch, Jonas Maximilian Dehling
Age- and size-related life-history traits of anuran amphibians are thought to vary systematically with latitude and altitude. Because the available data base is strongly biased towards temperate-zone species, we provide new estimates on eight afrotropical Reed Frog species. A meta-analysis of the demographic traits in 44 tropical anuran species aims to test for the predicted clinal variation and to contrast results with variation detected in temperate-zone species. The small-sized reed frogs reach sexual maturity during the first or second year of life, but longevity does not exceed three to four years...
2017: PloS One
https://www.readbyqxmd.com/read/28179514/historical-amphibian-declines-and-extinctions-in-brazil-linked-to-chytridiomycosis
#18
Tamilie Carvalho, C Guilherme Becker, Luís Felipe Toledo
The recent increase in emerging fungal diseases is causing unprecedented threats to biodiversity. The origin of spread of the frog-killing fungus Batrachochytrium dendrobatidis (Bd) is a matter of continued debate. To date, the historical amphibian declines in Brazil could not be attributed to chytridiomycosis; the high diversity of hosts coupled with the presence of several Bd lineages predating the reported declines raised the hypothesis that a hypervirulent Bd genotype spread from Brazil to other continents causing the recent global amphibian crisis...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28179395/molecular-physiology-of-freeze-tolerance-in-vertebrates
#19
REVIEW
Kenneth B Storey, Janet M Storey
Freeze tolerance is an amazing winter survival strategy used by various amphibians and reptiles living in seasonally cold environments. These animals may spend weeks or months with up to ∼65% of their total body water frozen as extracellular ice and no physiological vital signs, and yet after thawing they return to normal life within a few hours. Two main principles of animal freeze tolerance have received much attention: the production of high concentrations of organic osmolytes (glucose, glycerol, urea among amphibians) that protect the intracellular environment, and the control of ice within the body (the first putative ice-binding protein in a frog was recently identified), but many other strategies of biochemical adaptation also contribute to freezing survival...
April 2017: Physiological Reviews
https://www.readbyqxmd.com/read/28177589/the-evolution-of-amniote-gastrulation-the-blastopore-primitive-streak-transition
#20
REVIEW
Matthew J Stower, Federica Bertocchini
In the animal kingdom, gastrulation, the process by which the primary germ layers are formed involves a dramatic transformation in the topology of the cells that give rise to all of the tissues of the adult. Initially formed as a mono-layer, this tissue, the epiblast, becomes subdivided through the internalization of cells, thereby forming a two (bi-laminar) or three (tri-laminar) layered embryo. This morphogenetic process coordinates the development of the fundamental body plan and the three-body axes (antero-posterior, dorso-ventral, and left-right) and begins a fundamental segregation of cells toward divergent developmental fates...
February 8, 2017: Wiley Interdisciplinary Reviews. Developmental Biology
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