Decline in amphibian populations

Jason Botto Period 2 (now period 5) 1. Explain the importance of what happened in El Valle de Anton.
 The importance of El Valle De Anton spurred the movement to create systems to preserve frogs worldwide. In Panama a town name El Valle De Anton once deeply respected their golden tree frogs, and ironically they were not disturb when the frogs started disappearing. When the corpses started to pile up, the scientific community began to become concerned and began an effort to preserve the golden

What is causing the global decline of amphibians? Introduction: In just the last 2 decades, there has been alarming declines and extinctions in amphibians globally. However, what is causing these drastic declines remains a mystery to many scientists mainly due to the anomalies or limitations in the data collection and various environmental factors varying concurrently. Therefore, only causal links and correlations have been deduced and the factors yet remain to be proven. Although climate warming

and toad species. However, until recently, whether one lived in a city, a rural, or anywhere in the world, chances were high that an individual was not far away from seeing a frog or other amphibians such as toads, salamanders, and caecilian. What has changed? In the U.S., the reduction of frogs and other amphibians is serious in California, the Rocky Mountains, the Southwest, and Puerto Rico. Other continents such as Australia,

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

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

individuals cannot move across a landscape to mix with individuals of other populations, local extinctions can result. Additionally, the smaller a population is, the more vulnerable it is to extinction if that population is also isolated (i.e., lacks the ability to intermix with other populations (Fagan & Holmes 2006)). Juveniles are often especially important for movements that help maintain genetic diversity in populations (Rothermel & Semlitsch 2002). Long distance movements of animals can take

of diversity loss in the case of amphibians and bee populations in North America. The issue with the bee population in the film “Silence of the Bees” is centered on colony collapse disorder, the possible reasons as to why it is happening, and how bee enthusiasts are trying to combat the issue. The two amphibian films I watched included the documentary in class and the lecture entitled “The Evolution and Diversity of Amphibians” which explains why so many amphibians are becoming extinct, the possible

Frog populations decreasing is a response of increasing levels of habitat loss, the conditions the frog population is put under is unfavorable because the frogs have semi permeable skin which allows pollutants go be absorbed by the body. Their natural habitats are quickly shrinking and pollutants from populated areas are seeping into what’s left of them. Scientists believe the leading factor of this population decrease is due to habitat loss to humans, as we expand our horizons so quickly, many ecosystems

or the “Mexican Salamander” is critically endangered and can only be found in Lake Xochimilco, south of Mexico City. Mexico is home to 373 amphibian species. It is placed fifth with the largest amount of amphibian diversity among the richest countries. There are many factors that contributes to axolotls being a victim of near extinction. These amphibians were originally found in Lake Chalco with the biome that was desired by them. Axolotl live in freshwater biome with clean water and salt concentration

induces complete feminization and chemical castration in male African clawed frogs (Xenopus laevis). Proceedings of the National Academy of Sciences 107: 4612-4617. The authors have assigned key words described throughout this article including amphibian decline, endocrine disruption, pesticide and sex reversal. The larger or global context for the research conducted in this article is that the pesticide Atrazine is widely utilized across the entire world, contaminating water sources by mobilizing through