chapter 22

Question 1

dispersal allows organisms to

Answer 1

colonize new areas
escape competition
avoid inbreeding depression

Question 2

metapopulation

Answer 2

collection of spatially distinct populations (patches) connected via dispersal

Question 3

source-sink dynamic

Answer 3

sinks: populations in low quality small patches that cannot be supported
source: high quality habitat that on average allows the population to increase
excess individuals moving from source to sink will help sink survive

Question 4

stochasticity

Answer 4

chance fluctuations in populations

Question 5

metacommunity

Answer 5

set of local communities linked by the dispersal of one or more of their constituent species

Question 6

in situ speciation

Answer 6

lineage splitting in two on an island
contributes to local species diversity only when gene flow is unable to prevent population genetic differentiation

Question 7

levin’s model

Answer 7

temporal changes in the regional abundance of a species by extinction and colonization of subpopulations