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- All the individuals of a species that occupy a particular geographic area at a certain time.
- For example, the population of humans in Elkhorn at the time the photo was taken was 4082.
- Accelerating growth that produces a J-shaped curve when the population is graphed against time.
- Though humans are not the best choice because we do not have a equilibrium yet, this graph does show the exponential growth of humans after the industrial revolution and major scientific and medical advances.
- A factor that limits the growth, distribution, or amount of a population in a ecosystem.
- Examples of limiting factors include food, water, space, and shelter.
The size of a population that can be supported indefinitely by the available resources and services of an ecosystem.
The way in which an organism occupies a position in an ecosystem, including all the nessasary biotic and abiotic factors.
- An organism that kills and consumes other organisms.
- For example, a lynx is a predator to a snowshoe hare.
- An organism that is eaten as food by a predator.
- For example, an insect is prey to baby crocodiles and many other predators.
- A symbiotic relationship between two species in which both species benefit from the relationship.
- For example, photosynthesis algae lives inside coral and provides the coral with nutrient while it receives protection and a constant supply of carbon dioxide for photosynthesis.
- An organism whose niche is dependent on a close association with a larger host organism.
- For example, a brainworm and a deer.
When two or more organisms compete for the same resource in the same location at the same time.
- Use that does not lead to long-term depletion of a resource or affect the diversity of the ecosystem from which the resource is obtained.
- Sustainable use of a resource, whether it is water or an entire ecosystem, allows the resource to meet the needs of present and future generations.
- The period of time that is required for a population to double in size.
- The current doubling time for humans (for when the textbook was written) is 60 years.
A measure of the impact of an individual or a population on the enviorment in terms of energy consumption, land use, and waste production.
A pattern or activity that leads to a decline in the function of an ecosystem.
Use of Earth's resources, including land and water, at levels that can continue forever.
- The benefits experienced by organisms, including humans, that are provided by sustainable ecosystems.
- provision of food and clean water
- pollination of crops and vegetation
- conversion of atmospheric carbon into biomass
- beauty and spirituallity
- cycling of nutrients
The change of non-desert land into a desert, which may result from climate change or from unsustainable farming or water use.
- A form of tourism that is sensitive to the heath of an ecosystem and involves recreational activities provided by sustainable ecosystems.
- boat trips to see whales, dolphins