Science Ecology Chapter 2

• - A group of organisms of one species that live in the same place at the same time
• - (ex. Population of humans in a city)

• - Growth of a system that is proportionate to the amount already present
• - Limiting factors restrict exponential growth

-Factors that limit the rate/results of any process.

- The size of a population that can be supported indefinitely by the resources and conditions of a given ecosystem.

• - The place or function of a given organism within it's ecosystem
• - Different organisms may compete for the same niche

• -An organism that exists by consuming other organisms.
• -Usually is a predator to all things below it in the food chain

-An animal hunted/killed for food, especially by carnivorous animals.

-The symbiotic relation-ship between two species in which both species benefit from the relation-ship

-An organism whose niche is dependant on a close association with a larger "host" organism.

• -Competition between two organisms for the same resource.
• -Can limit population size.
• -The more energy used for competition, the less is used for growth and reporduction.

-Use of a resource that does not lead to long-term depletion of said resource, or affect the diversity of the ecosystem from which the resource is obtained.

• -The period of time that is required for a population to double in size.
• -(ex. The present doubling time for humans is 60 years)

• -A measure of the impact of an individual or a population on the environment.
• -Ex. (energy consumption, land use, and waste production)

-A pattern of activity that leads to a decline in the function of an ecosystem.

-Use if 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.

• -The change of non-desert land into a dessert.
• -May result from climate change and unsustainable farming or water use.

-tourism directed toward exotic, often threatened, natural environments, especially to support conservation efforts and observe wildlife.