#species balance

Biogeography Complete

The equilibrium number of species is achieved when:

“Immigration equals extinction” for the equilibrium number of species is achieved when. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Immigration exceeds extinction”, “Extinction exceeds immigration”, “Immigration stops”—refer to different states, processes, or scales and therefore

Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8

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Biogeography

At equilibrium, the rate of species immigration is:

“Equal to extinction rate” for at equilibrium, the rate of species immigration is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. The remaining alternatives—“Greater than extinction rate”, “Less than extinction rate”, “Unrelated to

Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4

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Biogeography

The equilibrium number of species on an island is a balance between:

“Colonization and extinction” for the equilibrium number of species on an island is a balance between. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Immigration and reproduction”, “Competition and predation”, “Mutation and genetic drift”—refer to different states, processes, or sca

Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4

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Island

Equilibrium model assumes:

“Colonization and extinction rates balance” for equilibrium model assumes. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Species number continually increases”, “Extinction rate decreases”, “Immigration rate constantly increases”—refer to different states, processes, or scales and t

Ref: The Theory of Island Biogeography, MacArthur & Wilson, Ch. 2-4

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