10-4 POPULATION PATTERNS. 1. POPULATION PROPERTIES Size (often hard to measure) Density– amount of population per unit of area (population crowding) #

10-4POPULATION PATTERNS

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


Dispersion – spatial organization of the population



•Clumped – population is clustered together, usually around resources or from social behavior

ex/ school of fish

clumped



•Uniform – the population is evenly dispersed from each other usually from social interactions

ex/ bird nesting sites or solitary predators

uniform

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

random

2. POPULATION DYNAMICS

Age Structure

i. the number of individuals of different ages within the population


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


Survivorship Curve

• probability of individuals surviving to a certain age


Survivorship Curve


I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)


Survivorship Curve


I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)


II – Survivorship rate equal at all ages

(Birds & reptiles)


II – Survivorship rate equal at all ages

(Birds & reptiles)


III – High birth rate, high infant mortality rate (Fish, Insects, Plants)


III – High birth rate, high infant mortality rate (Fish, Insects, Plants)

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10-4 POPULATION PATTERNS. 1. POPULATION PROPERTIES Size (often hard to measure) Density– amount of population per unit of area (population crowding) #