Island Biogeography

What is island biogeography theory described as

Metapopulations at the community level. Metapopulations focuses on one species but this focuses on a population of multiple species i.e., community

What is the equilibrium value for number of species in island biogeography theory?

A balance between the colonization and extinction rates

What is the change in number of species for island biogeorgraphy?

Determined by colonization rate (C) - extinction rate (E)

How is colonization rate affected by there being more species already on the island?

Colonization rate declines with more species already on the island

Why does colonization rate decline when there are a higher number of species already on the island?

How is extinction rate affected by the total number of species already on the island?

Extinction rate increases if more species are already on the island

The increase of extinction rate with more species already on the island and decrease of colinization rate with more species already on the island have what kind of lines?

Curved

• Colonization starts rapid then slows down as more species arrive

• Extinction rate start slow and speeds up as more species arrive

What does equilibrium between colonization rate and extinction rate mean?

The number of species on the island stays the same but which species are present will change

How is colonization rate affected by distance between islands

Closer islands have a higher colonization rate while further islands have a lower

How is extinction rate affected by size of islands?

Larger islands have a lower extinction rate while smaller islands have a higher

What is isolation relative to?

The dispersal ability of the species. If a species can disperse really well they will be less affected by distance between islands

What type of island has a rapid turnover of what species are on the island?

Small nearby islands have high colonization and high extinction so at equilibrium, the types of species will change constantly over time

What type of islands have small turnover of what species are on an island?

Large isolated islands have low colonization and low extinction so at equilibrium, the types of species will hardly change over time

What happens if an certain kind of ecomorph goes extinct locally in one island?

That niche becomes open for a different species of the same ecomorph (or similar niche) but could not be recolonized by a different ecomorph