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10-4POPULATION PATTERNS
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1. POPULATION PROPERTIES
• Size (often hard to measure)
• Density– amount of population per unit of area (population crowding)
# of individuals = population density
area (units2)
• Dispersion – spatial organization of the population
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1. POPULATION PROPERTIES
Dispersion – spatial organization of the population
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1. POPULATION PROPERTIES
Dispersion – spatial organization of the population
•Clumped – population is clustered together, usually around resources or from social behavior
ex/ school of fish
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clumped
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1. POPULATION PROPERTIES
Dispersion – spatial organization of the population
•Uniform – the population is evenly dispersed from each other usually from social interactions
ex/ bird nesting sites or solitary predators
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uniform
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1. POPULATION PROPERTIESDispersion – spatial organization of the population
•Random – the population is randomly scattered throughout the area
EX: Dandelions from random wind dispersion of seeds
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random
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2. POPULATION DYNAMICS
Age Structure
i. the number of individuals of different ages within the population
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2. POPULATION DYNAMICS
Age Structure
i. the number of individuals of different ages within the population
ii. different age groups may have different abilities such as birth/death rates
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2. POPULATION DYNAMICS
Survivorship Curve
• probability of individuals surviving to a certain age
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2. POPULATION DYNAMICS
Survivorship Curve
• probability of individuals surviving to a certain age
I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)
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2. POPULATION DYNAMICS
Survivorship Curve
• probability of individuals surviving to a certain age
I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)
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2. POPULATION DYNAMICS
II – Survivorship rate equal at all ages
(Birds & reptiles)
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2. POPULATION DYNAMICS
II – Survivorship rate equal at all ages
(Birds & reptiles)
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2. POPULATION DYNAMICS
III – High birth rate, high infant mortality rate (Fish, Insects, Plants)
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2. POPULATION DYNAMICS
III – High birth rate, high infant mortality rate (Fish, Insects, Plants)
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