island biogeography

Question 1

species over area graph…. mainland vs. islands

Answer 1

islands will have a much steeper slope

- larger areas will start off with more species

Question 2

factors that affect island species population

Answer 2

• area of island

- distance from mainland

Question 3

Ecological disharmony island biogeography

Answer 3

• non-representative proportions of some species
• will only get species on the islands with good dispersal
• predators usually absent on small islands due to higher extinction rate from small population size (pred die out because little prey)

Question 4

extinction and colonization

Answer 4

equilibrium between colonization and extinction

- some species never become extinct and others become extinct and recolonize repeatedly

Question 5

as equilibrium is reached what happens to turnover rate?

Answer 5

• at equilibrium high turnover rate

- species composition changes and is continuous

Question 6

what can you predict at equilibrium

Answer 6

• can predict numbers of species but not species composition

Question 7

over time what happens to colonization rate

Answer 7

• successful colonization rate decreases

Question 8

target effect: island biogeography

Answer 8

large islands have higher immigration rate than expected

Question 9

rescue effect: island biogeography

Answer 9

near islands have higher immigration rate which rescues chances of extinction

Question 10

tripartite theory

Answer 10

• more immigration with less isolation
• higher extinction with more isolation
• more immigration with more area

Question 11

Endemism

Answer 11

low extinction rate and high isolation, low immigration = speciation