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pops%201%20spring%2008%20student - What is a population...

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1 Population Characteristics • Density • Dispersion Population structure Population rates What is a population? Do not worry about reproductive strategies p. 1201-1202 (iteroparity and semelparity) Density of a species at given location is usually determined by: Resources Limiting Agents Population Characteristics: Density A street in Hong Kong, one of the most densely populated places in the world Often results from: -- -- Clumped dispersion Fusilier fish always travel in schools near coral reefs. Population Characteristics: Dispersion Fig. 56.2
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2 Often results from : Uniform dispersion Random dispersion "null model" -- pattern expected if no special forces acting on spatial distribution of individuals in population Fig. 56.2 Creosote bushes Sex ratio - Primary sex ratio = sex ratio at conception Secondary sex ratio = sex ratio at time of birth Tertiary sex ratio = sex ratio at some later stage in life 11:89 50:50 Richardson’s ground squirrel Elk 23:77 53:47 Adult Sex Ratio (M:F) 1 o /2 o Sex
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