3popdistrib - BIO 20 POP DISTRIB 1 POPULATION DISTRIBUTION...

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BIO 20 POP DISTRIB 1 POPULATION DISTRIBUTION & SURVIVORSHIP 1. ABUNDANCE absolute abundance - total no. organisms in population complete census - direct count of all organisms sampling - census small area - multiply by total area mark – release – recapture - mark small sample, recapture marked 2. DENSITY density - concentration of organisms crude density - number per unit of area - includes unusable habitats ecological density - number per unit of suitable habitat if low density? - more food & space - fewer opportunities for reproduction if high density? - less food & space - more repro, also disease & predation 3. DISTRIBUTION spatial distribution - also spacing, dispersion, arrangement random - no pattern (wind-distributed) uniform - equal distanced (uniform habitat) clumped - clustered, most common - select most suitable habitats - also behavioral (sociality, repro)
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BIO 20 POP DISTRIB 2 other factors - dispersal patterns (emigrate, immigrate, migrate) - temporal patterns (circadian, tidal, lunar, seasonal, annual) 4. AGE STRUCTURE
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