2004). Recent questions surrounding the ecology of poison frogs are based on the production of the toxin, the role that it plays for the frog, and the effects that it has on frog predators. Research has indicated that poison frogs obtain the majority of their toxic alkaloids from dietary sources rather than biosynthesizing the chemicals. The current struggle in this area is identifying the exact dietary sources for which the poison frogs obtain alkaloids (Saporito et al. 2007).
Hayes argued, “the impacts of atrazine on amphibians and on wildlife in general are potentially devastating” (Hayes et al. 4). Atrazine causes disease and deformities and is a threat to both humans and wildlife. Atrazine is the most common pesticide contaminant of ground and surface water that can spread a half million pounds of atrazine more than 1,000 km from the point of application via rainfall (Hayes et al. 1).
Invasive animals have e destroyed major natural systems, agricultural systems and aquatic life in tidewater areas. Invasive animals lead to destruction of crops, pasture and spread dangerous diseases to livestock (Wallace, 2013). This is a move that has seen the government use a large amount of expenditure on these animals. The threats postured by invasion of these species has forced the people to come up with efforts to curb the situation (Drake, 2009). An Invasive species working group was designed to minimize economic, environmental and human harm from the invasive species (Drake, 2009).
Discussion Questions: 1. What is the aim of GISD, and what does it focus on? GISD stands for Global Invasive Species Database. They aim to increase the awareness of invading species in order to increase early recognizing and prevention and management strategies. (Global Invasive Species Database, 2005) They focus on increasing awareness mainly about those alien species that might cause harm to an ecosystem; such as threaten the native biodiversity or affect the resources available to other species.
The attitudes and perceptions held about Indigenous Australians by Australians of European descent have changed over two hundred years of colonisation. Social Darwinism is among the leading ideological paradigms that have formed and maintained attitudes and perceptions, and influenced laws from 1770 to the present. Darwin’s theory of natural selection is a biological theory about how new species are formed and existing ones become extinct. Darwinism maintains that variations between existing organisms within a species confer differences in their survival and reproductive success. Progeny that inherit advantageous characteristics have an enhanced ability to survive and reproduce, ensuring that, over time, adaptive change will modify a
Introduction: The reasons for this study it to show the effect of acid rain on plants more specifically sunflower, radish, and clovers. The hypothesis is that the plant would ether die or be severely damaged due to constant exposure of the acid rain. With that in mind there is already historical evidence showing how exposure to Acid rain has caused damage in forests. One example is the Great Smoky Mountains national parks were acid rain has damaged and or kill an entire section of the forest. The reason to do this experiment is to show awareness towards this growing environments problem that is killing many important environments and ecosystems.
Infection of virus 4. Neonicotinoids C. Thesis: However, to closely look at human cause, Neonicotinoid insecticides are considered by many scientists as the primary factor responsible for the ongoing collapse of honeybee colonies. III. One of the main cause of CCD—Neonicotinoids A. Its application in agriculture B.
Biodiversity is highly important when determining the vulnerability and resilience of an ecosystem as species, genetic and population diversity can have detrimental effects on the ability of an ecosystem to survive and recover after damage. Stability within an ecosystem is determined by the levels of biodiversity, whether species be threatened or thriving. Large species and genetic diversity is important as variation within a species leads to greater ability to recover after dramatic damage and disruption. Within the Daintree Rainforest ecosystem, cassowaries and other vulnerable fauna species are abundant due to supportive habitats and lowland areas suitable and supportive for breeding habits. Small changes in an ecosystem can highly damage the abundance of specific species such as insects and marine life (fish species are adapted to very regulated temperatures, any change in water temp can often be detrimental to fish species).
Exotic Invasion Britton D. Hudson Sierra Nevada College Exotic species are those that are outside of their natural range and many of the exotic species around the world are becoming invasive, spreading and increasing in abundance and this is considered to be the most threatening factor affecting the biota of the U.S. national park systems (Primack, 235). Many species become invasive by unintentional transportation, they can be carried within the cargo of planes and trains, just as the brown tree snake was introduced to many pacific islands and now is devastating native, endemic bird species, species may also be transported on the undercarriage and inside of automobiles and within boat ballast water like the invasive quagga muscle or the easily spread spores of cheat grass that are invasive in many areas and are often times dispersed by humans and animals. To reduce and prevent introductions of exotic and invasive species preventative and regulatory measures are necessary, or else they will potentially dominate ecosystems and eliminate native species (Primack, 243). Often times the best restorative measure requires physical removal of an invasive species, like the__________________ that has been removed from _______________ and successfully so, as seen in improved ___________________. Exotic and invasive species pose ecological threats such as direct predation, parasitism and disease, as well as indirect implications including, habitat modification, abiotic alterations and trophic cascades.