22 terms

APES Unit D Chapter 6

Population Biology
r-adapted species
Specie that have high reproductivity (ex:mosquito) (growth at their biotic potential/exponential growth)
What type of graph is created by r-adapted species?
J-curve followed by boom and bust cycles centered on the carrying capacity
K-adapted Species
Produce more slowly as they approach the carrying capacity of their environment (ex: humans)
For k-adapted species, growth may be exponential for a time, but...
it can't be sustained
What type of graph is created by k-adapted species?
logistic growth, S curve (sigmoidal growth)
4 Density Dependent Limiting Factors
1. Food
2. Water
3. Disease
4. Predation
3 Density Independent Limiting Factors
1. Drought
2. Frost
3. Loss of Habitat
The ability to reproduce
Number of offspring produced
Production of new individuals
Death rate
% reach an age
Life Expectancy
Avg. Lifetime
For population growth, density independent factors tend to be ____
Abiotic (ex: heat, drought, fire, etc.)
For population growth, density dependent factors tend to be ____
Biotic (ex:predation, competition for resources, overcrowding, etc.)
Islands populations are natural experiments that apply to _____ biology
On islands ____ populations are more likely to go extinct than ___ ones
small, large
Large, near islands are more ____ than small far ones
Large diverse populations tent to maintain a ______
Genetic Equilibrium
Smaller, isolated populations lose diversity through what 4 things?
1. Founder effect
2. Demographic Bottlenecks
3. Inbreeding
4. Genetic Drift
(also used to determine minimum viable population size)
What can several small, isolated populations benefit from?
Gene Flow
Periodic immigration and emigration can create what?
A Metapopulation (helps preserve genetic diversity)