lec 19

Question 1

The rate of species extinction will _____

Answer 1

increase as the number of speies occupying the island increases

Question 2

Later immigrants may be unable to establish populations because

Answer 2

earlier immigrants already occupy available habitats and resources

Question 3

If the number of species living on the island exceeds S,

so then ___________ will decline

Answer 3

the extinction rate is greater than the immigration rate

- species richness

Question 4

If the number of species living on the island is lower than S

Answer 4

the immigration rate is greater than the extinction rate

- species richess will increase

Question 5

Island Biogeography] Equilibrium is affected

Answer 5

the size of the island and the distance of the island from the mainland

Question 6

the greater the distance to an island

Answer 6

the less likely species will be able to immigrate

Question 7

Island Biogeogrpahy

If the islands are the same distance from the mainland

Answer 7

S will be greater for the island with the largest area

• on larger island extinction rates are lower
• larger islands generally have more habitats and resources

Question 8

metapopulation theory: ________

For a particular species, the landscape is _______

Answer 8

• examines the colonization and local extinction of local population of a single species in an array of patches on a broader landscape
• patches of potential habitats, that vary in size, quality, degree of isolation from eachother

Question 9

each metapopulation patch can potentially

This local population is connected

Answer 9

support a distinct, partially isolated subpopulation

is connected to other patches by varying degrees through dispersal of individuals

Question 10

Metapopulation dynamics involve

Answer 10

two set of processes operating at two distinct spatial scales: single patch, landscape

Question 11

single patch

Answer 11

individuals move and interact with each other during routine actiities

Question 12

landscape

Answer 12

local populations interact through dispersal and colonization

Question 13

colonization

Answer 13

is the movement of individuals from occupied patches to unoccupied patches

Question 14

dispersing individuals may have a

Answer 14

significant chance of failing to locate another suitable patch to colonize

Question 15

metacommunity

Answer 15

a set of local communities inhabiting discrete patches that are linked by dispersal

Question 16

changing mosaic factors

Answer 16

disturbances
succesional changes
island biogeogrraphy, metapopulations and metacommunites and the ruels that guide them

Question 17

Disturbances

Answer 17

alter the biological and physical structures of these communites (Mosaics)

Question 18

Successional changes

Answer 18

occur within these communities

Question 19

island biogeography

Answer 19

the study of colonization and survival in island communites

Question 20

Examples of an island

Answer 20

A piece of land surrounded by water
An oasis in the desert
a woodlot in the center of a farm field
A park in a city
A wetland surrounded by farmland

Question 21

The study of island biogeography combines
_______ - __________
and
_______ - ___________

Answer 21

Connectivity - how is the island connected to the source population
Patch size - how big is the island

Question 22

The theory of island biogeography was developed to

Answer 22

explain patterns of species richness on islands

Question 23

For an uninhabited island _______

The species with the greatest dispersal ability

Answer 23

• the mainland species are the pool of possible colonizing species
• will be the first to colonize

Question 24

Immigration rate declines with increasing #’s of species on islands because

Answer 24

• when all mainland species are found on the island, the immigration rate is 0
• successful establishment of a new species on an island is based on whether a niche has been filled yet

Question 25

Adaptive radiation

Answer 25

The process whereby a single ancestral species evolves into a wide array of descendants

Question 26

metapopulation persistence results in

Answer 26

recolonization, because all local populations can potentially go extinct