ecosystems chapter 2 terms
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Chapter 2 Glossary terms
By Alexis boudreau
A group of organisms of ONE SPECIES that lives in the same place at the same time.
Ex. Human population in a 1 city in 2012
When a population increases due to unlimited resources, especially when a species is introduced to a new habitat. this is only temporary, until resources become limited.
A limiting factor is a factor that limits the growth, distribution, or amount of population in an ecosystem.
Ex. limits on resources such as food, water and shelter
- The size of a population that can be supported indefinately by the resources and conditions of a given ecosystem.
- population size is at an equilibrium when it has reached carring capacity.
- the sustainable carrying capacity for humans is unlikely to be able to sustain the 9-10 billion people expected by the end of the century.
- 2 ways to increase carrying capacity: altering an ecosystem so that more energy and resources can be consumed, OR altering behavior rather than the ecosystem itself.
An ecological niche is the way that an organism occupies a position in an ecosystem, including all of the necessary biotic and abiotic factors.
An organism that is eaten as food by a predator.
Ex. weasles and rabbits are the hawks prey- hawk gains energy by consuming organisms
A symbiotic relationship between 2 species in which both species benefit from the relationship.
Ex. coral and photosynthetic algae depend on eachother for survival
An organisms who's niche is dependant on a close association with a larger host organism.
Ex. the brainworm is a parasite of the white tailed deer.
When 2 or more organisms compete for the same resource in the same location at the same time.
-competition can limit the size of a population.
- organisms(such as birds) also compete with eachother for mates
- sustainable use of a source is use that does not cause long term depletion of the resource or effect the diversity of the ecosystem from which the resource is obtained.
- sustainable use 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.
Ex. humans persent doubling time is 60 years.
An ecological footprint is a measure of the impact of an individual or a population on the environment in terms of energy consumption, land use, and waste production
-humans on average have an ecological footprint of 2.2
- A pattern of activity that leads to a decline in the function of an ecosystem.
- -ecosystem does not have unlimited resources for current and future generations
- sustainability is the use of earths resources including land and water, at levels that can continue forever.
- ecosystem services are the benefits experienced by organisms including humans, that are provided by sustainable ecosystems.
- The natural result of all activities that occur in the biosphere
- The change of non-desert land into desert.
- desertification may result from climate change and ansustainable farming or water use.
- -clear cutting can lead to desertification
- Ecotourism is a form of tourism that is sensitive to the health of an ecosystem and involves recreational activities provided by sustainable ecosystems.
- Ex. snowshoeing, skating, skiing, canoeing etc.
An organism that kills and consumes another organism,.
Ex. hawk consumes smaller animals such as weasles and rabbits.
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