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oceanic islands - Coggle Diagram
oceanic islands
threats:
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-introduced species:
-have a large impact due to a lack of mammal predators natives are maladapted to survive their arrival
-some examples include: rats from shipwrecks, and cats as pets
-herbivores can also destroy indigienous flora (eg, rabbits)
importance:
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-oceanic islands make up less than 1/10th of the landmass but contain over 20% of bird, reptile and plant species
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features:
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-many endemic species (eg, dodos and lemurs)
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-"islands that are sufficiently isolated from major landmasses so it is difficult for species to colonise"
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madagascar:
-indigenous species:
-lemurs: endemic, omnivourous and mainly terrestrial (eg, ring tailed lemurs)
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conservation:
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-the best action is to kill invasive species (rats, cats and rabbits)
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endemic species:
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-due to absence of predators unusual characteristics develop (eg, flightless birds)
refuge areas:
-isolation acts as a refuge for some species to breed in (eg, albatross)
