Chapter 4: Populations & Communities
Types of Growth
.
Idealized growth
Exponential growth
Logistic growth
Biotic Potential
.
Reproductive rate
Ability to migrate
Ability to invade
Defense
Types of care
R=lots of kids no care
K= few kids lost of care
Limits
Density dependence: limits increase as population density increase
Density independent: population limited by abiotic factors regardless of number
Top down factors : control from predation
Bottom up control from resource scarcity
Community Interactions
Competitions - two organisms (same species or different) relying on same resources
Intraspecific : same species
Interspecific: different species (Resource partitioning)
Mutualism - interactions where both benefits
Commensalism: one species benefits other is unaffected
Amensalism: once species unaffected and other is harmed
Neutralism: neither species are harmed or benefits
Keys To Survival
Enough Resources
Tolerance to changes
High Reproduction Rate
Large Geographical distrubution
High Genetic Variation