ecosystems chapter 2 terms

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ecosystems chapter 2 terms
2012-09-26 22:17:54
chapter science

glossary term definitions
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  1. Chapter 2 Glossary terms
    By Alexis boudreau
  2. Population
    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
  3. Exponential growth
    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.
  4. Limiting factors
    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
  5. Carrying capacity
    • 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.
  6. Ecological niche
    An ecological niche is the way that an organism occupies a position in an ecosystem, including all of the necessary biotic and abiotic factors.
  7. Prey
    An organism that is eaten as food by a predator.

    Ex. weasles and rabbits are the hawks prey- hawk gains energy by consuming organisms
  8. Mutualism
    A symbiotic relationship between 2 species in which both species benefit from the relationship.

    Ex. coral and photosynthetic algae depend on eachother for survival
  9. Parasite
    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.
  10. Competition
    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
  11. Sustainable use
    • 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.
  12. Doubling time
    The period of time that is required for a population to double in size.

    Ex. humans persent doubling time is 60 years.
  13. Ecological footprint
    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
  14. Unsustainable
    • 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
  15. Sustainability
    • sustainability is the use of earths resources including land and water, at levels that can continue forever.
    • -
  16. Ecosystem Services
    • 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
  17. Desertification
    • 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
  18. Ecotourism
    • 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.
  19. Predator
    An organism that kills and consumes another organism,.

    Ex. hawk consumes smaller animals such as weasles and rabbits.