Community Ecology Processes, Models, and Applications

Island biogeography

DiversityFor single species

For single species

ImportantcharacteristicsView of the world Basic equationsolutions

P* = m/(e+m)

P* = 1 - e/m

For competitors: e=e

+ e 0

ij

S* = IM/(E+I)

Importance for management

Historically large butin practice uselessbecause islands dependcompletely on the mainland

LargeDiversity and speciespersistence dependenton isolation and regionalcommonness

Single – few speciesInternal pool of colonizersPatches equal (can be relaxed)Stochastic extinctions.

DiversityExternal mainland species poolIslands sinksStochastic extinctions

Metapopulation dynamics

Equilibrium proportion occupiedislands

Plate 3

Contrasting views on the world in the basic theories of island

biogeography and metapopulation dynamics. S, species number;

M, mainland pool species

number; E and I, number of extinct and immigrating species per

unit time (in island biogeography model); e and m, extinction and

migration rates (in

metapopulation model); P*, equilibrium proportion of

occupied islands/patches. See page 116.