What would happen if we got rid of all the mosquitos?

What eats mosquitos? What do mosquitos eat?

Exponential Growth

Logistic Growth A: Lag phase: slow growth B: Acceleration phase C: Exponential phase D: Carrying capacity D C A B

Figure 5-4 Logistic Growth of Yeast Population Carrying Capacity Section 5-1 the number of living organisms that a region can support without environmental degradation. Carrying capacity Number of Yeast Cells Time (hours)

Human Population Growth is exponential Industrial Revolution begins Agriculture begins Bubonic plague Plowing and irrigation

Factors that limit population growth Section Outline Factors that limit population growth Density-Dependent Factors Competition for resources Predation Parasitism and Disease Essentially anything “biotic” Density-Independent Factors: Abiotic factors: weather and climate natural disasters (bottlenecks) human activity Go to Section:

Biodiversity and Extinction

What is biodiversity? The DIVERSITY of all living things on Earth all plants, animals, bacteria, fungi, protists

Why do we need biodiversity? FOOD Medicine we get from other animals, plants, etc. Wood and paper products Future resources

Why do we need biodiversity? Species depend on each other. Extinction of one species will lead to extinction of other species.

Endangered Species

Honeybee Colony Collapse Disorder Pesticides and invasive parasites (mites) killing honeybees across the U.S.

Amphibian Crisis Half of ALL amphibians on the planet are endangered because of: Habitat Destruction Water pollution Invasive Species (parasitic fungus)