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Lecture 18

CLAB20 Lecture 18: Lecture19-2.pdf

Classical Studies
Course Code
Steve Joordens

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Neutral Theory
Landscape Ecology
Chapter 23

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Community Membership
There are three schools of thought what controls
community diversity:
Equilibrium theory—ecological and
evolutionary compromises lead to resource
Nonequilibrium theory—fluctuating conditions
keep dominant species from monopolizing
Neutral theory—species do not differ and
diversity patterns are a product of dispersal,
speciation and demographic stochasticity.
Speciation: the formation of new species as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding
populations from breeding with each other.
ability to predict if species can coexist. Using compromises of different resources to coexist.
disturbances and environmental fluctuations prevent species to exist in equilibrium.. Disturbance in environment keeps reseting
population sizes. Nature keeps things changing.
There are no species differences

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Neutral Theories
Neutral theory can predict diversity patterns
even when all species are competitively
equivalent and use the same resources.
E.g., they have identical fitness
forest: likely to see many
different types of trees. They
all respond the same way to
the environment, or similar
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