[Definition] A set of spatially disjunct populations, among which there is some immigration. [Term] 
Metapopulation
S p e c i e s p o p u l a t i o n
M e t a p o p u l a t i o n
P o p u l a t i o n
A g g r e g a t i o n
D e m e
L o c a l p o p u l a t i o n
S u b p o p u l a t i o n