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Bio/Int. 2

Lesson 27- Population Growth

TermDefinition
Population group of individuals of the same species living in the same geographic area, this group undergoes three phases of life: growth, stability, and decline
Population Dynamics the study of the factors that affect the three phases of a population
Growth occurs when available resources exceed the number of individuals able to use them
Stability usually the longest phase of a population’s life cycle, resources and population numbers are relatively equal
Decline the decrease in the number of individuals in a population, can eventually lead to extinction
Exponential (unrestricted) Growth growth pattern in which the individuals in a population reproduce at a constant rate
Logistic (restricted) Growth growth pattern in which a population’s growth rate slows or stops (reaching carrying capacity) following a period of exponential growth
Carrying Capacity largest number of individuals of a population that a given environment can support
Age Structure the number of individuals in each age group of a population
Physical Environment what surrounds a living organisms- shelter, water supply, space availability, soil, light
Niche the biological role played by a species in the environment
Competitive Exclusion occurs between two species when competition is so intense that one species causes the second species to move from an area
Competitive Release occurs when the competing species is no longer present and its restriction of the winner’s population size is removed
Carnivore organism that obtains energy by eating animals
Herbivore organism that obtains energy by eating only plants
Symbiosis relationship in which two species live closely together
Mutualism symbiotic relationship in which both species benefit from the relationship
Parasitism symbiosis where one species benefits while harming the other, example is a tapeworm in a human
Commensalism symbiosis where one species benefits and the other is neither harmed nor gains a benefit, example is a remora fish attached to a shark for a ride
Extinction the elimination of all individuals in a species for a specific location
Local Extinction the loss of all individuals in a population in a specific area
Species Extinction all members of a species and its populations in different areas go extinct
Secondary Extinction loss of prey populations can cause an extinction of any species that depends largely or solely on that species as a food source
Minimum Viable Population the smallest population size that can avoid extinction by environmental or genetic factors
Geographic Range the total area occupied by a species
Created by: ECOTScience10-11
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