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- All of the species that occupy a particular geographic area at a certain time.
- Examples: Elephants, Humans, etc.
- Accelerating growth that produces a J-shaped curve when the population is graphed against time.
- Example: A new organism enters an ecosystem that has a lot of resources such as algae.
- A factor that limits the growth, distribution, or amount of a population in an ecosystem.
- Example: Perch not getting enough oxygen, light and hiding places so that they can live.
The size of a population that can be supported indefinitely by available resources and services by the ecosystem.
- The way that an organism occupies a position in the ecosystem, including all the necessary biotic and abiotic factors.
- Example: Cave-dwelling bats regulate insect populations and support other cave-dwelling organisms.
- An organism that kills to and consume other organisms.
- Examples: Wolves, Lions, Bears, etc.
- An organism that's eaten as food by a predator.
- Examples: Deer, Rabbit, Moose, etc.
- A symbiotic relationship between two species which both are benefited from it.
- Example: Algae and Coral, algae benefits the coral with its colour while the coral provides the algae with protection, nutrients and a constant supply of carbon dioxide for photosynthesis.
- An organism whose niche is dependent on a close association with a larger host organism.
- Example: Larval worms that are laid in blood vessels of a white-tailed deer's brain.
- When two or more organisms compete for the same resource.
- Example: Competition between female sparrows for resources to lay eggs.
- Use that doesn't lead to long term depletion of a resource or affect the diversity of the ecosystem from which the resource is obtained.
- Example: Humans sustaining our resources so that we don't use them too quickly.
- The period of time that's required for a population to double in size.
- Example: The human doubling time is 60 years
- A measure of the impact that an individual or population makes on the environment in terms of energy consumption, land use and waste production.
- Example: The ecological footprint of each Canadian person is approximately 8 hectares/person
- A pattern of activity that leads to a decline in the function of a ecosystem.
- Example: Since our world has a big ecological footprint and depend on non-renewable fossil fuels, our world is likely to be unsustainable.
- Use of Earth's resources, including land and water, at levels that can continue on forever.
- Examples: Consuming fewer resources, Use of existing resources efficiently, energy efficiency, etc.
- The benefits experienced by organisms, including humans, that are provided by sustainable ecosystems.
- Example: Natural results of all activities that occur in the biosphere.
- The change of non-desert land into a desert.
- Example: European settlers cutting down trees for lumber and cleared the land for agriculture but created desert like conditions.
- A form of tourism that's sensitive to the health of an ecosystem and involves recreational activities produced by a sustainable ecosystem.
- Example: Skiing, Hiking, Fishing, etc.