logistic population growth model

- Review: The graph on the left depicts the logistic growth of a population. The population initially increases until it reaches the inflection point. At that point, the rate of increase slows until it reaches carrying capacity. - The logistic population growth modelshows that population growth varies with population density. In real-life situations, scarce resources—such as food, mates, or shelter—limit population growth. - One limitation of the model is that all individuals are considered equal regardless of their age. Adults have a greater impact on a population than young. - The logistic population growth model predicts that populations with either low or high densities relative to carrying capacity will have different life-history strategies. - Low-density populations are called r-selected and have adaptations that lead to rapid reproduction, like early maturation. Populations remain under the carrying capacity. Many insect species are considered to be r-selected. - High-density populations are called K-selected. They have adaptations—like slow growth rate—that enable them to survive and reproduce with few resources. Populations increase and remain at carrying capacity. Many large mammals, like lions, are K-selected.

In terms of population strategies, how would you classify robins?

- Robins exhibit some characteristics of r strategists and some characteristics of K strategists and should be thought of laying somewhere along the continuum between the two strategies.

14.5.3 Population Ecology: Population Strategy: r vs. K Flashcards by Irina Soloshenko

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14.5.3 Population Ecology: Population Strategy: r vs. K Flashcards

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