• In truth, extinction encompasses more than just species loss: global species extinction results from the progressive loss of individuals and populations, causing a decline in genetic diversity and ultimately leading to reduced ecosystem function as key species drop out of the system.

• Habitat fragmentation affects the exchange of individuals and thus genetic material, which is necessary to maintain viable breeding populations.

• We consider two patterns of migration: equal coupling (i.e., dispersing individuals are equally likely to move to any of the other patches) and nearest neighbor coupling (i.e., dipersers move only to adjacent patches).