Populations

Volcanoes, tornadoes, floods, fires are examples of density -____ factors

...

What are five limiting factors

1. competition 2. predation/herbivory 3. parasitism/disease 4. unusual weather 5. natural disasters

The number of males and females of each age in a population is the population's ___.

age structure

How can a population increase in size?

decreased death rate, decreased birthrate, immigration

If the death rate of a population is greater than the birthrate, the population ____.

decreases

Competition, predators, herbivores, parasitism, and overcrowding are density - _____ limiting factors.

dependent

Under ideal conditions with unlimited resources, a population will grow ____.

exponentially

Limiting Factor

factor that causes population growth to decrease

What decreases competition?

fewer individuals

Logistic Growth

growth pattern in which a population's growth slows and then stops following a period of exponential growth

Exponential Growth

growth pattern in which the individuals in a population reproduce at a constant rate

How can a population decrease in size?

increased death rate, decreased birthrate, emigration

If the birthrate of a population is greater than the death rate, the population ____.

increases

Some human activities, such as damming rivers, or spraying insecticides, are density - ___ limiting factors.

independent

Carrying Capacity

largest number of individuals of a particular species that a particular environment can support

Density-Independent Limiting Factor

limiting factor that affects all populations in similar ways regardless of the population density

Density-Dependent Limiting Factor

limiting factor that depends on population density

____ growth occurs when a population's growth slows or stops, following a period of rapid growth.

logistic

Immigration

movement of individuals into an area occupied by an existing population

Emigration

movement of individuals out of an area

Population Density

number of individuals per unit area

What factor contributes to exponential growth?

unlimited resources