A population of Tree Frogs is introduced into southern Georgia in 19.pdf

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A population of Tree Frogs is introduced into southern Georgia in 1986. Twenty years later, the frogs are spread across the southern half of Georgia, Alabama, and Mississippi. Discuss the forces affecting the population of tree frogs, including: the four types of limits that could be responsible for stopping the spread of the frogs northward possible population-dependent controls that limit the population density of these frogs a description of the logistical growth model and the basic factors that go into it (equations not required) How did this happen? Solution Four types of limits could be responsible for stopping the spread of frogs northwards: 1. Abiotic: Unfavorable climate 2. Abiotic: Lack of habitat (broad leaf trees) 3. Biotic: Predation of eggs, larvae and adults 4. Biotic: Competition from better adapted species Population dependent controls: 1. Depletion of food 2. Cannibalism within the species Logistical growth model In logistical growth model,the population growth rate per capita decreases as the population approaches the maximum population the environment can sustain based on the available resources. It is represented by a sigmoid curve. Factors affecting the logistic growth model include the available resources, population growth rate, death rate, predation, etc,.

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