Simpson index

Simpson's diversity index (also known as Species diversity index) is a measure of diversity. In ecology, it is often used to quantify the biodiversity of a habitat. It takes into account the number of species present, as well as the relative abundance of each species. The Simpson index represents the probability that two randomly selected individuals in the habitat belong to the same species.

Overview

For plant species the percentage cover in a quadrate is usually used, for animal species, for example in a river, the number of organisms of a species is used. The reason percentage cover is used is because it is usually very difficult to count all the individual grass plants.

The formula for the Simpson index is:



Where S is the number of species, N is the total percentage cover or total number of organisms and n is the percentage cover of a species or number of organisms of a species.

When using the Simpson Index for lower numbers, misleading results can be obtained, with obviously less diverse areas having a higher index than they should. One way around this when studying on land is to include bare earth as an extra species, which yields more realistic results.

The Simpson index was first proposed by the British statistician Edward H. Simpson in a paper in Nature in 1949.

See also

References

External links

Ecology (also known as Oekologie, Okology, or Oekology[1],from Greek: οίκος, oikos, "household"; and λόγος, logos
..... Click the link for more information.
Biodiversity is the variation of life forms within a given ecosystem, biome or for the entire Earth. Biodiversity is often used as a measure of the health of biological systems.
..... Click the link for more information.
species is one of the basic units of biological classification. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.
..... Click the link for more information.
Plantae
Haeckel, 1866[1]

Divisions

Green algae
  • Chlorophyta
  • Charophyta
Land plants (embryophytes)
  • Non-vascular land plants (bryophytes)

..... Click the link for more information.
Editing of this page by unregistered or newly registered users is currently disabled until (UTC) due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or
..... Click the link for more information.
Plantae
  • Chromalveolata
  • Heterokontophyta
  • Haptophyta
  • Cryptophyta
  • Alveolata

  • ..... Click the link for more information.
  • formula (plural: formulae, formulæ or formulas) is a concise way of expressing information symbolically (as in a mathematical or chemical formula), or a general relationship between quantities.
    ..... Click the link for more information.
    Edward Hugh Simpson is a British statistician best known for describing Simpson's paradox[1] along with his counterpart Udny Yule.

    References

    1. ^ Simpson,E. H. (1951).

    ..... Click the link for more information.
    Nature is a prominent scientific journal, first published on 4 November 1869. Although most scientific journals are now highly specialized, Nature is one of the few journals, along with other weekly journals such as Science and
    ..... Click the link for more information.
    19th century - 20th century - 21st century
    1910s  1920s  1930s  - 1940s -  1950s  1960s  1970s
    1946 1947 1948 - 1949 - 1950 1951 1952

    Year 1949 (MCMXLIX
    ..... Click the link for more information.
    Biodiversity is the variation of life forms within a given ecosystem, biome or for the entire Earth. Biodiversity is often used as a measure of the health of biological systems.
    ..... Click the link for more information.
    This article or section is in need of attention from an expert on the subject.
    Please help recruit one or [ improve this article] yourself. See the talk page for details.
    ..... Click the link for more information.
    The Shannon index (incorrectly the Shannon–Weaver index or also incorrectly known as the Shannon-Weiner Index [1]) is one of several diversity indices used to measure diversity in categorical data.
    ..... Click the link for more information.
    Edward Hugh Simpson is a British statistician best known for describing Simpson's paradox[1] along with his counterpart Udny Yule.

    References

    1. ^ Simpson,E. H. (1951).

    ..... Click the link for more information.
    Nature is a prominent scientific journal, first published on 4 November 1869. Although most scientific journals are now highly specialized, Nature is one of the few journals, along with other weekly journals such as Science and
    ..... Click the link for more information.


    This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.