Amphibian

The lifestyle of the amphibian is very complex and fragile. Just the mere fact that amphibians are biphasic causes them to run into a variety of problems. Since they deal with both an aquatic and terrestrial environment, they tend to run into an increased amount of pollutants and environmental changes. Pollution both on land and in water can affect water pH and other variables that can be very harmful to an amphibian’s survival. Since amphibians can be used basically as biomarkers to the environment

unprecedented rate (Collins and Crump xv). The most rapidly disappearing groups of organisms are amphibians, and over 200 of these species have been brought to extinction since the year of 1970 (Save the Frogs). One of the largest causes of their rapid declines is the spread of the lethal disease chytridiomycosis, a fungal disease largely spread by humans (Whittaker and Vredenburg). Frogs and other amphibians are dying from this chytridiomycosis because of our selfishly taking them from the wild to an

​Reptiles and amphibians are two species of animals. They have been around for millions of years before we were even thrive. Amphibians were some of the first vertebrates to ever walk the Earth. They evolved from a species of prehistoric fish. Reptiles began to appear million years ago. They evolved directly from a species of amphibians. In other words, they are closely related and have the same ancestor. Many amphibians and reptiles are similar, even a number of people may still confuse several

An anatomical advantage of the reptile class is that their limbs have shifted to the bottom, compared to amphibians, which are on their sides. The Texas Horned Lizard can shoot blood out of its eyes; it certainly is one of the most interesting animals in the reptile class. Birds differ from the previous three classes in their physical appearance, even though

There are many environmental culprits that are causing species of amphibians to decline in numbers. Consequently, there are an alarming number of amphibians across the U.S. with deformities such as missing limbs or extra limbs due to environmental causes. Environmental scientists say that the widespread occurrence of amphibians with deformities might be due to water pollution or chemical pollutants in the water. There are other factors that might have caused these frogs to have missing or extra limbs

Amphibians are an endangered group of animals where almost 20.41% species (among the total of 49 species) in Bangladesh has been recognized as threatened (IUCN, 2015), yet an enormous unrecognized diversity is calling for a taxonomic exploration. But there are several challenges for amphibian taxonomists as they have remarkable cryptic diversity & phenotypic plasticity as well as many frogs are morphologically similar but can be distinguished by genetic divergences. DNA barcoding could be a quick

Desiccation It is essential for amphibians to maintain a water balance during terrestrial migratory and dispersal movements (Spotilia & Berman 1976). If amphibians become dehydrated, their oxygen consumption and metabolic state becomes at risk (Pough et al. 1983). As with movement rates, water loss rates are species specific. The northern leopard frog has a higher loss rate than the marine toad due to the northern leopard frog’s higher diffusion rate of water through their permeably skin (Bentley

It is often debated which species share common ancestors, in particular, how closely related amphibians, mammals and osteichthyes are. The evolution of tetra pods, or four legged animals, from aquatic animals such as fish can be traced back 365 million years ago to the Devonian, 408-360, mya, and evidence shows that this evolution was divergent in nature (Freeman, S. 2011; Myer, A and Zardoya, R. 2004). Divergent evolution, also sometimes termed adaptive radiation, occurs over many geological times

Nowhere near a plethora of evolution has adorned the history of the poison dart frog, yet the evolutionary history will fascinate one. The toxic amphibians are beautifully constructed creatures, their magnificent colors, the highly poisonous oil on their skin, and their hasty, yet graceful, movements. But where did it all begin? It began with the ancestor of the poison dart frog, the primitive frogamander. In the beginning, poison dart frogs were not as colorful as they are today; rather dull and

Background Information Amphibians in General Amphibian species are declining around the world. According to The IUCN Red List of Threatened Species “one third of the about 6,500 extant amphibian species as threatened with extinction” (Rödder et al., 2009, p. 53). Main threats to amphibians include habitat loss/degradation, global warming, pollution, invasive species, over-exploitation and pathogens (Wanner, 2015). Amphibians are considered an indicator species. Indicator species are very sensitive