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Hello everyone.
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In island biogeography theory, there have been two criteria on which the dispersal of organisms depend.
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The first is the size of the island and the second one is the distance from the mainland.
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Distance of the island from the mainland.
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So, the island biogeography theory is mainly dependent on the two things.
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The immigration rate in this graph these lines are representing the immigration rate and here it is representing the extension.
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So see, suppose we have a mainland here.
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This is the mainland and we have two land.
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Islands here, the large one and the small one.
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So according to you, where the dispersal will be maximum.
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So the dispersal will be maximum in the large islands, means towards the large island because it has the ability or the capacity to hold more diversity of individuals.
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So that's why the size of the island.
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And secondly, if this is again a mainland and then we have one island here and then we have one island.
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Then where will be the dispersion maximum? so dispersion will be maximum towards the island that is closest to the mainland.
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So size of the island and distance from the mainland.
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So these are the two criteria on the basis of which island biogeography theory has been designed.
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Now if you talk about the immigration process and the extinction process, now see the immigration will be maximum at the island near the mainland.
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That's why the immigration is maximum here.
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You see this line? it is maximum for the island near the mainland, this island.
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And the island that is far from the mainland that is this island, their immigration will be less because the.
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Will not prefer to travel the long distance.
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Okay, so that's why the immigration is more in the closest island.
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Now if we talk about the extinction, so extension is higher...