October 21-Late - Probability of birds migrating very far...

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Probability of birds migrating very far away is less likely than birds migrating to another island, stepping stone effect, slowly expand farther. Migration is random and unplanned, birds get caught in storm. May or mar not adapt, all is accidental. The farther away you get from a source, the fewer there are. Species diversity in terms of migration and extinction—coming and going determines how many species you have on an island. Successful immigration : adapting and having offspring, population developing. Rate of migration is inversely related to the number of species— the more species you have the less the migration rate is because of the competition (limited resources). Extinction rate increases as the number of species increases (in the island) Example: there are 17 species of birds on an island—will species diversity increase or decrease? Why? Increase because there is a higher immigration rate since there are not a lot of birds on the island.
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