biology: ecostystems, communties, populations

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Author:
Madeline
ID:
181067
Filename:
biology: ecostystems, communties, populations
Updated:
2012-11-01 00:41:31
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biology
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study
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  1. Definitions
    Ecosystem: biological community of interacting organisms and their physical environment.

    Habitat: environmental area that is inhabited by a particular species of animal, plant or other type of organism.

    Niche: the position or function of an organism in a community of plants and aniamls. The particular area within a habitat occupied by an organism.

    Population: all the same organisms living in the same area.

    Community: a number of different organisms from populations that interact in the same area. Vary in species.
  2. Interactions
    Commensalism: one organism obtains a benefit without harming the other.

    Mutualism: both individual benefits.

    Competition: contest between organisms.

    Predation: interaction where a predator feeds on its prey.

    Parasitism: one benefits with harming the other, sometimes without killing.

    Amensalism: one species hurts another but neither benefit.

    Herbivory: animal eats a plant like organism. animal benefits.
  3. Populations growth
    = Births (B) - Deaths (D) + Immigrations (I) - Emigration (E)
  4. Total population
    = no. of animslas in 1st sample (tagged)  X  total no. of animals in the 2nd sample

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    number of marked animals in 2 sampled (recaptured)

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