Chapter 4 Vocab Flashcards
(30 cards)
Equilibrium
If births plus immigration are more or less equal to deaths plus emigration over time
Population Growth
The change in population number, represented by(Births + Immigration)-(Deaths+Emigration)=Population Growth
Carrying Capacity
The maximum population of a species that a given habitat can support without the habitat being degraded over the long term
Biotic Potential
The rate at which members of a species reproduce, if unlimited.
Recruitment
Survival through early growth stages to become part of breeding population
Environmental Resistance
Combination of biotic and abiotic factors that may limit population increase
Type I Survivor Curve
good early survival and die of old age(Humans)
Type III Survival Curve
Poor early survival, survival improves with age
Population Density
The Number of individuals per unit area
Limiting Factor
A factor that causes population growth to decrease
Density Dependent
A limiting factor that depends on population size
Density independent
Affect all populations in similar ways regardless of the population size
Competitive Exclusion Principle
States that no two species can occupy the same niche in the same habitat at the same time
Critical Number
The lowest population for survival and recovery
Non-feeding Symbiosis
Simply means two organisms living together
Commensalism
One species benefits, the other is unaffected
Parasitism
One species benefits and the other is adversely affected
Competition
Both species are adversely affected by interaction
Vectors
Agents that carry the parasite from host to host
Keystone Species
A species extremely important in maintaining an ecosystem
Territorality
Defense of a resource against members of the same species
Self Thinning Plants
when plants produce a large number of seedlings in a small area
Selective Preassures
Each factor that can affect which individuals survive and reproduce and whi are eliminated
Speciation
The process by which populations of one species separate into new species
