109656
Description
Mind Map by harry_bygraves, updated more than 1 year ago
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Created by harry_bygraves
almost 11 years ago
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Variation in population size
- Population size - number of individuals in a population
- Population density - the
number of individuals
per unit area
- Population growth - a
change in the number of
individuals
- Population growth rate - the
change in number of
individuals per unit time
- S-shaped population growth curves
- the population growth curve
of a population colonizing a
new habitat in which
conditions are intially ideal
has an s shape
- Phase 1; Slow growth
- Phase 2; exponential growth
- Phase 3; decelerating growth
- Phase 4; population stabilizers
- Phase 1; Slow growth
- the population growth curve
of a population colonizing a
new habitat in which
conditions are intially ideal
has an s shape
- Enviromental factors that limit popualtion size
- Density dependant factors - as the
popualtion density increases,
density-dependant factors affect a
larger proportion of the population.
they are usually biotic and include
intraspecific competition for space
and other resources, availability of
food, disease, and preditation
- Density-independant factors - these
facotrs affect the same proportion of the
population no matter how great its
density. they are usually abiotic. the most
important are weather and climate
- Density dependant factors - as the
popualtion density increases,
density-dependant factors affect a
larger proportion of the population.
they are usually biotic and include
intraspecific competition for space
and other resources, availability of
food, disease, and preditation
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