What term describes the maximum population size that an environment can support over time?

What term describes the maximum population size that an environment can support over time?

• A. The maximum population size an environment can support over time.
• B. The average population size that remains constant.
• C. The total number of species in a habitat.
• D. The annual growth rate of a population.

Answer: (A)

Carrying capacity is the maximum population size an environment can support over time given the available resources like food, water, space, and shelter. When a population is small, it can grow quickly, but as resources become more limited, growth slows and the population tends to level off near this limit. This leveling off is described by the logistic growth idea, where the growth rate decreases as the population approaches carrying capacity. Carrying capacity can change if conditions improve or worsen—more resources can raise it, while habitat loss or drought can lower it. For example, a deer population might grow until the forest can no longer provide enough food, at which point births and deaths balance to keep the population around a sustainable level. This term specifically describes the maximum sustainable size, rather than an average size, the total number of species, or the rate of growth.

Carrying capacity is the maximum population size an environment can support over time given the available resources like food, water, space, and shelter. When a population is small, it can grow quickly, but as resources become more limited, growth slows and the population tends to level off near this limit. This leveling off is described by the logistic growth idea, where the growth rate decreases as the population approaches carrying capacity. Carrying capacity can change if conditions improve or worsen—more resources can raise it, while habitat loss or drought can lower it. For example, a deer population might grow until the forest can no longer provide enough food, at which point births and deaths balance to keep the population around a sustainable level. This term specifically describes the maximum sustainable size, rather than an average size, the total number of species, or the rate of growth.