Decline in amphibian populations

Vanessa Wuerthner Instructor: Qing Deng BIOL 537 Immunobiology Term Paper Due: 4-16-15 Death by Ranavirus: An Amphibian Killer Emerging infectious diseases are thought to be a major contributor to a worldwide decline of amphibians, with about one third of amphibians either threatened or endangered (Daszak, Cunningham, & Hyatt, 2003). There are many pathogens that are known to infect amphibians, including fungi, virus and bacteria. One such pathogen of great concern is the highly pathogenic ranavirus

Artificial illumination consists one of the most useful and integral parts of the human civilisation as it allows all human activities to expand during the night or to take 30 place in areas where the lighting is inadequate. Its misuse though, causes a phenomenon known as photopollution/ light pollution/ luminous pollution. This phenomenon is caused because artificial light is being reflected from the various components of the atmosphere. The International Dark-Sky Association define light pollution

One out of eight birds, one out of four mammals, and one out of three amphibians are currently at risk for extinction (Shah). To prevent these organisms from going extinct, the Endangered Species Act (ESA) was put into place in the United States in 1973. This gave the federal government the responsibility to protect endangered and threatened species, as well as critical habitat. The goal of the ESA is to get a population healthy so it can later be delisted. This is done by giving the plants and

Have you ever heard of the Holocene extinction? Well, I’m sorry to break the news to you but we are in the middle of the Sixth Great Extinction of our planet, “an event characterized by the loss of between 17,000 and 100,000 species each year” (Biodiversity, 2013). Today, I want to inform you about diseases, which is one of the lesser-known aspects of extinction and wildlife conservation. I am knowledgeable on this topic due to a considerable amount of scholarly, research, and from firsthand experience

emissions. The synergistic impact of these human driven activities questions the survivability of organisms in the morphed climatic environments. At one level fragmented habitats increase intra and inter species competitions, resulting in decline of population of species, grouping them under rare and threatened category. At other level, the amplified global temperatures in parallel with low precipitation rates, not only creates unsuitable external habitat conditions but also impose internal changes

rtificial illumination consists one of the most useful and integral parts of the human civilisation as it allows all human activities to expand during the night or to take 30 place in areas where the lighting is inadequate. Its misuse though, causes a phenomenon known as photopollution/ light pollution/ luminous pollution. This phenomenon is caused because artificial light is being reflected from the various components of the atmosphere. The International Dark-Sky Association define light pollution

information that are irrelevant to the argument are not included. Main-argument conclusion: (1) Outdoor cats are becoming socially unacceptable. Premises for (1): (2) Outdoor cats bear a significant share of the blame for the decline in in wildlife, and especially bird, populations. (3) Outdoor cats threaten the health of human. (4) There are multiple hazards of outdoor living that are terrible for cats. Sub-argument conclusion: (2) Premises for (2): (2a) The numbers of 20 common North American bird

Wolf introduction has happened to Yellowstone National Park. It has improved the ecosystem drastically, balancing it, and allowing some species to thrive and others to arrive. Yellowstone National Park has improved, and with that, more tourists tour there, giving the government more income. Vegetation has gone back to thriving, and birds that rely on it have thrived, too. However, Taxpayers lose a lot of money from wolf introduction. Some people think that wolves kill livestock, making human life

where large numbers may congregate. Frogs, toads, caecilians, and salamanders are the members of the class Amphibian (amphi- meaning “on both sides” and bios- meaning “life”). These members always require water for reproduction. Most Amphibians undergo metamorphosis, which is a usually degenerative pathological change in the structure of a particular body tissue. And, in the case of Amphibians, it is the changing of a tadpole into

Final Exam Response After doing extensive research on the American beavers (Castor canadensis), I am most optimistic about population growth for this species. These semi-aquatic mammals are a keystone species and amazing ecosystem engineers who indirectly contribute tremendously to biodiversity, stabilization, and trophic cascades within boreal forest. Major challenges this species faces is human encroachment within their habitats due to beavers notorious behavior in creating dams, which can positively