Island biogeography ppt

  • Island biogeography examples
  • Island biogeography graph explained
  • Island biogeography theory

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    Island biogeography

  • 1. Khwopa College BSc, Environment Science Zoology Island Biogeography Saroj Raj Gosai 2014

  • 2. Island Biogeography  The study of animal life on islands forms one of the fascinating chapters in the study of Zoogeography  The biological environment on the island is different from that of the continents and this has a far reaching effect on its fauna  Wallace has divided the islands into two distinct categories namely Continental islands and Oceanic islands 2

  • 3. Continental islands  Islands that have been connected with the nearby mainland at one time or other  Through the sinking of the land or by a rise in the sea level they must have become separated from the continent by a stretch of the sea  The sea, separating the two may be narrow like the straits of Dover which separates the continental islands of Great Britain form the continent of Eurasia or may be wide like the Formosa strait which separates the island of Formosa from mainland China  Are

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    ISLAND BIOGEOGRAPHY http://www.eyesonafrica.net/african-safari-seychelles/north-island.htm.

    Presentation on theme: "ISLAND BIOGEOGRAPHY http://www.eyesonafrica.net/african-safari-seychelles/north-island.htm."— Presentation transcript:

    1 ISLANDBIOGEOGRAPHY

    2 What is Island Biogeography?
    A field within biogeography the study of the distribution of species spatially and temporallyEstablishment and explanations of the factors which affect species richness of natural communities

    3 “The Theory of Island Biogeography”
    HistoryFounded by Robert MacArthur and E.O Wilson (ecologists) in the 1960s“The Theory of Island Biogeography”Intention of predicting the number of species that would exist on a newly created islandBegan on islands extends over to other biomes

    4 “Because islands are small geographic units with distinct boundaries, they serve as useful models to illustrate the mechanisms of biogeographic phenomena. Intensive ecological studies on islands have provided key ins

  • island biogeography ppt

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    Island biogeography

  • Island biogeography What controls the number of plant and djur species on this island? Does size matter? Isolation? Habitat variation? Environmental history? Island in the Bay of Fundy

  • Species - area relationships Johann Reinhold Forster (1729-98) served as a botanist with Captain Cook. After exploring the islands of the southern Pacific he observed: “Islands only producera a greater or less number of species as their circumference is more or less extensive”. Small islands harbour fewer species. The Forsters’ (father & son) collecting specimens in Tahiti

  • Species-area relationships Arrhenius (1921) “Species and Area” Gleason (1922) “On the relation between species and area”. Ecology, 3. Gleason censused the plants in 240 1m2 plots in an aspen wood in northern Michigan. He found 27 species in total, with an average of 4 species per quadrat.

  • Species-area relationships Preston (1962) “The canonical distribution of commonewss and rarity”. Ecolo