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BEastBio-U2-Ecology

Unit 2: Ecology

TermDefinition
Ecology study of the interactions among living things and their surroundings.
Community collection of all of the different populations that live in one area.
Heterotroph organism that obtains its energy and nutrients by consuming other organisms.
Mutualism ecological relationship between two species in which each species gets a benefit from the interaction.
Trophic Level level of nourishment in a food chain.
Density Independent (Limiting) Factor environmental resistance that affects a population regardless of population density.
r-selected Species Species whose population size tends to fluctuate greatly with changes in the environment; are small and tend to reproduce quickly in their lifetime, have large numbers of offspring, and not live very long.
Specialist consumer that eats only one type of organism
Biotic Factor living (or once living)organisms within the environment.
Ecosystem collection of organisms and nonliving things, such as climate, soil, water, and rocks, in an area; all biotic and abiotic factors in an area.
Decomposer detririvore that breaks down organic matter into simpler compounds, returning nutrients back into an ecosystem.
Parasitism ecological relationship in which one organism benefits by harming another organism.
Carrying Capacity number of individuals that the resources of an environment can normally and persistently support.
Habitat combined biotic and abiotic factors found in the area where an organism lives.
Abiotic Factor nonliving parts of the environment.
Producer organism that obtains its energy from abiotic sources, such as sunlight or inorganic chemicals.
Commensalism ecological relationship in which one species receives a benefit but the other species is not affected one way or another.
Food Chain model that links organisms by their feeding relationships.
Density Dependent (Limiting) Factor environmental resistance that affects a population that has become overly crowded.
Exponential Growth dramatic increase in population over a short period of time.
k-selected Species Species whose population size is maintained at or near its own carrying capacity; are large and tend to take several years to reach reproductive maturity, have few offspring, and live long lives.
(Ecological) Niche all of the factors that a species needs to survive, stay healthy and reproduce, including food, abiotic conditions and behavior; An organism's OCCUPATION or JOB.
Species group of organisms so similar to one another that they can breed and produce fertile offspring.
Consumer organism that obtains its energy and nutrients by eating other organisms.
Competition ecological relationship in which two organisms attempt to obtain the same resource.
Food Web model that shows the complex network of feeding relationships within an ecosystem.
Age Structure Graphs show the populations of males and females in different age groups; Used to predict whether a population will increase, decrease, or stay the same.
Demography study of human population growth.
Biodiversity variety of life within an area.
Population all of the individuals of a species that live in the same area.
Autotroph organism that obtains its energy from abiotic sources, such as sunlight or inorganic chemicals.
Symbiosis ecological relationship between members of at least two different species that live in direct contact with one another.
Biome regional or global community of organisms characterized by the climate conditions and plant communities that thrive there.
Death Rate number of deaths in a given time period per 1,000 organisms.
Birth Rate number of births in a given time period per 1,000 organisms.
Generalist species that does not rely on a single source of prey.
Growth Rate The Death rate subtracted from the Birth Rate. A positive number shows population growth, a negative number shows a shrinking population.
Created by: BEastBio
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