A small, scattered population Which would be least likely to be affected by a density-dependent limiting factor? A large, dense population or a small, scattered population A small, scattered population

Two ways a population can decrease in size? decreased birthrate and emigration

increase exponentially. Suppose that a species of fish is introduced into a new environment in an attempt to reduce the population of insects. The fish has no natural predators in the new environment. The fish population would most likely increase exponentially.

density-dependent limiting factor. A disease resulting in the deaths of one third of a dense population of bats in a cave would be density-dependent limiting factor.

The pattern of spacing between individuals across the range of a population is its distribution.

Something that controls the growth or size of a population is a limiting factor.

How would you describe a population that is decreasing in size? The death rate is becoming higher than the birthrate.

a logistic growth curve. The various growth phases through which most populations go are represented on a logistic growth curve.

If you know the range of a population, then you know the areas that are inhabited by the population.

During some kinds of population growth, the size of each generation of offspring is larger than the generation before it. So, as the population gets larger, it grows more quickly. This situation is called exponential growth.

Demography is the scientific study of human populations.

The movement of organisms into a range is called immigration.

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

There are 150 Saguaro cactus plants per square kilometer in a 10-square-kilometer area of Arizona desert. To which population characteristic does this information refer? population density

____________ __________limiting factors affect all populations, whether the population size is two or two hundred. Density-independent

When you graph a population’s exponential growth over time, you will have an _________ graph. J-shaped

___________ growth occurs when a population’s growth slows or stops, following a period of rapid growth. Logistic

The __________ model of population growth accounts for the influence of carrying capacity. logistic

An indication that a country has completed the demographic transition is a ____ birthrate and a _____death rate. Low, low

Emigration can cause a population to ____________________ in size. decrease

Scientists who study human populations and predict the growth rate of the world and of individual countries study the science of ____________________. demography

A population of bacteria with an unlimited supply of nutrients will eventually show ____________________ growth. exponential

If a population is undergoing logistic growth, it may have a growth rate near zero once the ____________________ has been reached. carrying capacity

Identify 3 limiting factors that depend on population density. Density-dependent limiting factors become limiting only when the population density—the number of organisms in a given area—reaches a certain level. These factors include competition, predation, parasitism, and disease.

Identify 3 limiting factors that do not depend on population density. Density-independent limiting factors affect all populations in similar ways, regardless of population size. These limiting factors include weather, natural disasters, and certain human activities, such as damming rivers and clear-cutting forests.

List the three patterns of distribution. Random, uniform, clumped

List the four factors that affect population growth. birth rate death rate immigration emigration

Compare and contrast the graph of exponential growth to the graph of logistic growth. The pattern of exponential growth is a J-shaped curve. The pattern of logistic growth is an S-shaped curve.

What will reduce competition within a species’ population? Fewer individuals