The larger island will therefore have a higher species richness since it can support more species and is more easily colonized by them due to its proximity to the mainland.
Why is species richness greater on larger islands?
- Larger islands will have a wider variety of habitats, so species that migrate to the island will diversify to fill the available niches, which has an impact on an island's biodiversity.
- Since there is a greater diversity of habitats and consequently a greater availability of resources, larger islands typically have more species than smaller islands.
- As a result, species richness is predicted to decline in smaller islands farther from the mainland due to higher local extinction rates and less immigration, while increasing in larger islands closer to the mainland due to high levels of immigration and a larger area available for foraging (MacArthur & Wilson, 1963, 1967.
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