Articles tagged with Amphibians
Researchers found that male wasp genitalia serve as an effective anti-predator defense, deterring some tree frogs from eating them. Male genital spines are used to pierce and sting predators, preventing them from swallowing the wasps. This study highlights the significance of male genitalia in animal defense.
Scientists have solved a decades-long puzzle about why ancient tetrapod fossils in Ireland's Jarrow Assemblage had their internal bone structure altered. The team used CT scans and laser ablation to analyze the chemistry of the bones, finding evidence of superheated fluids that cooked and melted the bones.
A team of scientists has estimated the weight of a prehistoric salamander using five living animal analogues and 19 body mass estimation techniques. The study found that the large-bodied Eryops was around 160 kilograms, while the Paracyclotosaurus was roughly 260 kilograms.
A six-year study confirms stream contamination with pesticides from trespass cannabis cultivation sites in Northern California, threatening local aquatic species and freshwater resources. The study's findings highlight the need for proactive approaches to mitigate the impacts of these sites on downstream waterways and habitats.
Climate change poses a significant threat to southwestern US reptile and amphibian populations, with limited-dispersal species facing the greatest vulnerability. The study suggests that prioritizing conservation efforts for these species may be crucial to mitigating habitat loss.
A study published by the University of Zurich has found that vocal communication in vertebrates has a common and ancient evolutionary origin, dating back to around 407 million years ago. The research used vocal recordings and contextual behavioral information from 53 species across four major clades of land vertebrates.
Researchers at the University of Tennessee are investigating the movement of amphibian pathogens in wildlife trade networks, with a focus on disease mitigation strategies. The project aims to understand how socio-economic factors impact pathogen dynamics and develop market-based mechanisms to promote healthy trade.
Researchers from the University of Tsukuba discovered that changes in the extracellular environment during metamorphosis and body growth enable newt muscle fibers to dedifferentiate and contribute to limb regeneration. This process is crucial for newts' ability to regenerate limbs throughout their life cycle.
A study published in Scientific Reports found that amphibian and reptile invasions cost the global economy at least $17.0 billion between 1986 and 2020. The majority of costs were attributed to American bullfrog and brown tree snake invasions, highlighting the need for effective policies to limit future invasions.
A study reveals over 50 common toads in UK woodlands, defying expectations of their terrestrial lifestyle. The discovery highlights the importance of tree cavities as a habitat for amphibians and encourages conservation efforts.
Researchers studied miniature frogs from the genus Brachycephalus and found that their small vestibular system prevents them from maintaining balance. The tiny frogs can jump but struggle to control their trajectory mid-leap.
The first international study of its kind assesses the status of all reptile species, revealing that at least 2,000 species are threatened with extinction. The study found that 50% of turtle and crocodile species face extinction threats, while 30% of forest-dwelling reptiles and 14% of arid area reptiles are in danger.
Scientists have discovered six new species of frog in Mexico's forests, with one being the country's smallest, the 13mm-long Craugastor candelariensis. The newly discovered species are known as 'direct-developing' frogs, emerging from eggs as perfect miniature frogs.
Scientists from around the world gather to discuss various amphibian and reptile diseases, with a focus on conservation and management strategies. The conference aims to identify solutions to mitigate the impact of these diseases on herpetofauna populations, which are currently experiencing alarming extinction rates.
Researchers developed a simple and efficient method for surveying amphibians using environmental DNA analysis, which can be conducted by anyone without specialist knowledge. This technique resolves issues with conventional methods such as capture and observational surveys, allowing for more accurate monitoring of amphibian habitats.
A new species of rainfrog, Pristimantis gretathunbergae, has been discovered in Panama and named after global environmental activist Greta Thunberg. The frog's habitat is threatened by climate change and deforestation, highlighting the importance of conservation efforts.
A Brazilian study expands amphibians' known reproductive modes to 74, creating a new classification. The research analyzed 2,171 species of amphibians, including anurans with 71 reproductive modes, some laying eggs in aquatic environments while others develop directly.
The study reports 21 species of Pakistan's amphibians, highlighting the need for conservation strategies to control populations and address human-caused threats. Researchers propose an inclusive wildlife conservation approach incorporating poorly documented taxa like amphibians to maintain ecosystem health.
Research reveals eastern spadefoot toads spend more time above ground than previously believed, contradicting a century-old misconception. The study used spotlighting to detect large numbers of the endangered species in various habitats.
A study found that ancient amphibians' spine stiffness varied with habitat, with more aquatic species having more rigid backbones. The researchers collected measurements on over 40 species of temnospondyls, providing valuable information on early vertebrate adaptations to water-to-land transitions.
Researchers at the University of Washington successfully analyzed Micropholis stowi fossils excavated during a 2017-2018 collection trip to Antarctica. The findings reveal that this salamander-sized amphibian was more widespread than previously recognized, with evidence suggesting it could have adapted to various environments.
Researchers confirm presence of two distinct but interbreeding species of caecilians on São Tomé island. The study suggests that volcanic activity may have driven the divergence of the limbless amphibians around 300,000 years ago.
A study of spitting cobras shows that a combination of venom components have evolved to create an instantly painful venom, used for defense rather than hunting. The research provides a remarkable example of convergent evolution and suggests early humans may have influenced the evolution of spitting in cobras.
Researchers found that the island-based Guttural Toads had significantly reduced body size and hindlimb length compared to their South African counterparts. This rapid dwarfism raises questions about the evolutionary mechanisms driving this change in less than a hundred years.
A recent study found that mammals, birds, and amphibians have lost an average of 18% of their natural habitat range due to land use changes and climate change. The loss could increase to 23% by 2100 in a worst-case scenario.
A reanalysis of a global amphibian disease study found the main conclusions lack evidence and are unreproducible. The research review previously linked the chytrid fungus to hundreds of amphibian declines, but the new analysis identified data deficiencies and methodological issues.
A study by the UPV/EHU-University of the Basque Country found that microplastics cause mortality in detritivores and reduce tadpole growth. Microplastics also attach to periphyton, altering ecosystem productivity, and are ingested by organisms, highlighting their potential impact on freshwater ecosystems.
A new study finds that biodiversity loss is causing a smaller, less diverse snake community in the tropics. The decline of tropical snakes is an 'invisible' outcome of biodiversity loss and has upward effects on higher-order predators.
Researchers found that birds and mammals have encapsulated Golgi tendon organs set directly at the muscle-tendon junction, detecting tension in precise areas. This allowed for controlled motion and a selective advantage that conserves energy.
Researchers have found interactions between multiple genetic lineages of the amphibian-killing chytrid fungus, including a previously unknown lineage widespread in Southeast Asia. This discovery suggests that genetic recombinations can create more virulent hybrids, posing additional threats to amphibians and conservation efforts.
A new study found that naproxen's degradation products are up to 15 times more toxic to southern toad larvae than the medication itself. Researchers emphasized the importance of considering the full life cycle of medications when evaluating their environmental impact.
Researchers used ecological and evolutionary attributes to model extinction risk for data-deficient amphibians, finding over 1,000 species threatened with extinction. Half of these species are likely Endangered or Critically Endangered, primarily in the Neotropics and Southeast Asia.
A red-shouldered hawk was observed attacking and dismembering a ghost crab on a South Carolina beach. The incident is the first documented case of a raptor consuming any species of crab in North America.
The study reveals Bd as one of the most destructive invasive species, causing at least 501 amphibian species decline. Despite this, some species show recovery and host resistance.
Researchers from UTA describe a previously unknown species of snake, Cenaspis aenigma, found in the stomach of a Central American coral snake. The discovery reveals unique features that distinguish it from known genera, including undivided subcaudal scales and cup-like structures on its hemipenes.
A new study predicts that climate change will have a more significant impact on global biodiversity than land use changes by 2070. Vertebrate communities are expected to lose between a tenth and over a quarter of their species locally due to climate change.
A deadly fungus, chytridiomycosis, affecting amphibian populations was traced to the Korean peninsula through genetic sequencing of 177 fungal samples. Human trade of amphibian species accelerated its global spread, with strains showing varying levels of virulence.
Rare amphibian species on rocky plateaux in western India are threatened by erosion and disease. The research highlights the need for greater protection of these habitats to preserve the species.
Human habitat alteration leads to global phylogenetic homogenization, replacing diverse species with similar clades. Average loss of 13.5% in phylogenetic diversity reported across five continents.
A South American amphibian, Siphonops annulatus, has a liver that produces blood cells throughout its lifetime and breaks down collagen. Researchers found melanomacrophages in the species' liver cells can remove and break down collagen, potentially helping to prevent cirrhosis.
Experts weigh in on whether keeping reptiles and amphibians as pets should be restricted due to public health and animal welfare concerns. A team from Ghent University argues that with proper information and care, these animals pose no greater burden than traditional pets.
A new strain of ranivirus is causing mass mortality in amphibian populations in Serra da Estrela Natural Park, Portugal. The virus also affects fish and reptiles, complicating the situation and requiring urgent optimization of conservation strategies.
A newly described species of extinct reptile from the Triassic period in Texas had a strikingly dome-shaped head, similar to that of dinosaurs. The study found internal partitions or zones in the skull, which were similar to those of pachycephalosaur dinosaurs.
A study of 100 species found that over 90% were affected by the forest edge effect, with the majority declining in abundance. The negative impact extended far into the forest interior, making conservation efforts crucial to protect biodiversity.
Amphibians are experiencing severe declines worldwide, with a study confirming that threats differ among regions. Local conservation efforts are key to reversing losses, as global efforts have been unsuccessful.
A recent study found that six commonly used insecticides kill amphibian parasites, potentially decreasing the number of parasites an amphibian must defend against. The study also showed population-specific differences in pesticide resistance, highlighting the importance of considering multiple populations when assessing toxicity.
Researchers successfully eliminated a lethal chytrid fungus in a wild amphibian population using antifungal treatment and environmental disinfection. The breakthrough study, published in Biology Letters, marks the first time a fatal fungal infection has been eradicated from a wild population.
Researchers found dramatic differences in pond ecosystems depending on the ratio of males to females in mosquitofish populations. Female-dominated ponds exhibited fewer zooplankton and a greater abundance of algae.
Researchers at Benaroya Research Institute have discovered that chitin, previously thought to be absent in vertebrates, is endogenously produced in fishes and amphibians. This finding challenges longstanding biological assumptions and opens up new avenues for biomedical applications.
A study found that modern methods for predicting species distributions under climate change often leave out rare and threatened species. In Africa, over 90% of listed species are missed by popular tools, despite these species being critical to conservation efforts.
A meta-analysis of 50 studies reveals that selective logging halves mammal and amphibian species numbers at specific intensity levels. Logging companies are urged to respect biodiversity thresholds.
A new study reveals that micropredators naturally occurring in freshwater bodies can efficiently consume the infectious stages of the deadly chytrid skin fungus, reducing infection pressure on amphibian hosts. This natural behavior may provide a realistic method for preserving amphibians in Bd-infected areas.
A new study found that micropredators can efficiently consume zoospores of the deadly chytrid skin fungus, reducing infection pressure on potential hosts and potentially alleviating the impact of chytridiomycosis. This natural behavior may offer a realistic method for preservation of amphibians in Bd-infected areas.
A new study identifies 78 exceptional protected areas as 'irreplaceable' for conserving global biodiversity. These sites harbor majority of threatened species' populations, including Critically Endangered Laysan Duck and unique amphibian species.
This study uses ecological niche factor analysis to predict amphibian richness hotspots in Southern and Central China, providing insights into potential conservation strategies. The research estimates diversity over spatial quadrates incorporating climatic and geophysical information.
Researchers discovered that the giant Triassic amphibian Metoposaurus had a two-seasonal climate and needed water for its lifestyle. The species used broad, flat head and forearms to burrow under the ground during dry season, while its growth pattern revealed unique adaptations.
A study published in PLOS ONE reveals that up to 83% of birds, 66% of amphibians, and 70% of corals are highly vulnerable to climate change but not currently listed as threatened on the IUCN Red List. This means they may not be receiving focused conservation attention, putting their survival at risk.
A 250-million-year-old burrow in South Africa's Karoo Basin has yielded a remarkable discovery: an injured amphibian, Broomistega, and its aestivating therapsid companion, Thrinaxodon. The fossilized remains suggest that short periods of dormancy and burrowing behavior helped mammal ancestors survive the Permo-Triassic extinction event.
A study found that protected areas in Catalonia have a high number of animal deaths on the roads, with amphibians being most susceptible. Researchers suggest building tunnels for amphibians to reduce mortality rates.
A study by Penn's Daniel Janzen and colleagues reveals that four-fifths of protected forest areas have experienced declines in health, with half suffering more serious losses. The research highlights the challenges faced by conservation efforts, including human encroachment, logging, and climate change.