Ch. 8
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Age structure
Proportion of individuals at various ages
Biotic potential
Capacity for growth
Constant loss curve
Die at all ages at same rate, like songbirds
Early loss curve
Die at early age, like bony fish and annual plants
Late loss curve
Die later in life, like humans elephants and rhinoceroses
Random dispersion
speaks for self, fairly rare
Environmental resistence
All factors that limit growth in a population
Reproductive time lag
Period needed for the birth rate to fall and the death rate to rise in response to resource overconsumption
Intrinsic rate of increase
r, rate at which population would grow if it had unlimited resources
Clumped dispersion
Most common because resources vary, offers protection, easier to catch prey, and done for mating ritual. Like wolf packs, fish schools, geese flocks
Uniform dispersion
Used for scarce water resources, like creosote bushes
Opportunists
Reproduce whenever conditions are favorable or when a disturbance opens a new habitat
Top down population regulation
By predation
Bottom up population regulation
By the scarcity of resources
Brown tree snake
Native to Australia New guinea and Solomon Islands. Moved to Guam in WW2, completely destroyed ecosystem, and cause human deaths.
Bubonic plague
Swept through European citied in the 14th century. Density dependent disease
Life table
Shows protected life expectancy and probability of death for individuals at each age in a survivorship curve