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Chapter 17

Populations and Communitites

interact to act upon or influence someting
biosphere the total area of the earth that contains and supports life
biome a large area of the earth that has similar ecosystems and weather
population density the number of individuals in a population in a particular area
sample a part that represents an entire population
stability the ability of a community to resist change
growth rate the amount by which a population's size changes in a given time
carrying capacity the largest density an ecosystem can support for a particular population
competition when organisms try to use the same resource
density-dependent factor a factor related to the density of a population that affects population size
density-independent factor a factor that affects the populations size, but does not depend of the population density
immigrate to move into a population
emmigrate to leave a population
boom-bust cycle a period in which the densities of populations increase or decrease at the same time
uniform when a population spreads out evenly through an ecosystem
clumped when a population spreads out in small groups through an ecosystem
random when a population has no order as to how it is distributed through an ecosystem
interdependent having to rely on each other
trophic stucture the feeding relationships between species in a community
predation a relationship in which one species eats another species
camouflage the colors or patterns on animals that help them hide in their surroundings
symbiosis a relationship in which two different species live in close association
parasitism a symbiotic relationship in which one organism feeds off of another organism
host an organism that is food for a parasite
mutualism a symbiotic relationship in which both organisms benefit
commensalism a symbiotic relationship in which one organism benefits and the other is not affected
vegetation the plant life in an area
canopy the tops of the forest trees
disturbance a large change in a community
toxic poisonous
succession the process of ecological change in a community
primary succession the changes in a lifeless environment that create a community
secondary succession the changes in a community as it recovers from the effects of a disturbance
Created by: mrspuffisphat21



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