BIO205 Lecture 11
- Lecture 11: Connecting small population
- Chipmunks move!
o 4 blocks of wood forests and the dots are where the chipmunks were found
o The lines are the fence ropes
o Hash double lines are streams
o The arrows show the movement of chipmunks
o Are these populations?
- We define metapopulations as...
o A set of subpopulations within a given area...
o ...held together by dispersal or movement between subpopulations
- We can use four conditions to define metapopulations
o Suitable habitat occurs in discrete patches
If they’re all living in the same area, they’re all synchronized so there’s no
reason for us to study it and make up a new term
o Even the largest subpopulation has a substantial risk of extinction
o Habitat patches must not be too isolated
If they’re too isolated, there’s no movements
o Dynamics of subpopulations are not synchronized
If they’re all synchronized, it’s just one big population
- The dynamics of a metapopulation are influenced by three variables
o Extinction (E)
o Colonization (C)