Bullet 2: Fluctuations in Population Growth

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Presentation transcript:

Bullet 2: Fluctuations in Population Growth MT 3: Ecology

Review of Population: Group of the same species that live in the same location

What are significant changes that can happen in an ecosystem? Pair-Share: Turn to partner and discuss for 30 seconds.

Types of Changes Natural Events: Human Interactions: Abiotic Changes: Biotic Changes:

What specific factors cause a population's size to change? Birth Death Immigration Emigration

How does each factor cause a population to change? Increase Birth Death Immigration Emigration decrease Increase decrease

Increase in population Birth Increase Immigration

Decrease in population Death Decrease Emigration

Types of population growth 1. Exponential growth: occurs when resources are unlimited 2. Logistic growth: occurs when resources are limited

Exponential Growth Occurs under perfect conditions – unlimited resources, no predators In nature, does not occur very long Ex: 2, 4, 8, 16, 32, 64, 132, 264

Exponential Growth

Logistic Growth More realistic in nature because of limited resources (food, shelter, mates) S-shaped graph. Population grows until its carrying capacity is reached.

Logistic Growth

Carrying Capacity The number of individuals in a population that can be supported by its environment. Based on resources (food, shelter, mates) in the environment. When a population reaches carrying capacity, the population has a net growth rate of zero.

Question: In nature, do you think most populations have the same number of individuals all year long? No, most populations fluctuate in size.

Question: What season would you predict that many populations reproduce? Defend your answer. Spring: moderate temperatures, adequate water supply, abundance of grass/plants (producers) so most consumers have something to eat

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