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NATURAL POPULATION FLUCTUATIONS Delaney Atkinson What is it? Natural population fluctuations are what determines the amount of species or resources in an environment. Some examples: • Large or lesser amounts of food • Disease outbreaks • Climate change or devastations • Good or bad weather • Lack of space- exceeding carrying capacity How population of the prey affects the population of the predators depending on limiting factors. Carrying Capacity The maximum number of organisms that can be sustained by available resources over a given amount of time. Increased population creates competition for food, which means a decrease in nutrition. That leads to a decrease in an individuals growth and reproductive success. Competition arises when a population exceeds carrying capacity. Stronger organisms survive, while the weaker ones die off or risk death by relocating. POLAR BEAR VS. SEAL A polar bear’s most popular prey is the seal. They rely on their hunting skills and the seal’s population to survive. However, other factors affect the population of the seals and the polar bears. Everyone has heard of global warming, well this is affecting the bear and seal’s way of life. Global warming causes a negative population fluctuation for the Arctic. The polar bear relies on the ice to travel and hunt on, but as the ice continues to melt, the polar bear struggles to catch seals because they stalk above the water on the ice. The less nourishing seals they have to eat, the more the polar bear’s population will decline. LYNX VS. HARE Reasons for increasing: Spikes in population for the hare can be caused by nourishing weather for plants to grow for them to thrive off of. The increased availability of prey for the lynx causes better reproduction of the lynx population. Reasons for decreasing: Declinement of the hare can be caused by climate change, disease, or a bad weather season that would cause adapting issues, kill the hare’s food, ruin their homes, or force them to leave. As a result of the lowering of hare population, the lynx has less prey to live off of causing them to die off and they can also be affected by the environment issues. Works Cited https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3084066/ http://www.oxfordbibliographies.com/view/document/obo-9780199830060/obo9780199830060-0061.xml https://www.britannica.com/topic/population-fluctuation