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10 Cards in this Set

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  • Back
Dispersal ability
Equilibrium Theory of Island Biodiversity
The larger an island is, and the closer it is to a source population, the higher the equilibrium number of species.
Dynamic equilibrium
S should attain equilibrium value over time, Immigration + Evolution = Extinction - Emigration.
Single large habitat
Large reserves needed to prevent edge effects.
Many small habitat
Several small reserves should protect richness.
Forest state
Large situation: shading, moisture, decomposers, soil, fungi, termites, soil evolution (expansion, weathering, retention).
Posture state
When too small: dessication, soil changes (compaction, infiltration, erosion, nutrient loss), river incision, water table drop, invasive weeds.
Latitudinal gradients in species diversity
Most taxa are diverse near the equator - we live in a hotspot, huge diversity of plants because of the diversity of kinds of soils, especially serpentines.
Integrated hypothesis
Communities are discrete groupings of particular species that are closely interdependent and nearly always occur together.
Individualistic hypothesis
Species are independently distributed along gradients and a community is simply the assemblage of species that occupy the same area because of similar biotic needs.