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18 Cards in this Set

  • Front
  • Back
What is a population?
* all the members of a species living in the same place at the same time.
Properties of populations?
*density, size and dispersion
density
*the number of individuals per unit area or volume
dispersion
*is relative distribution or arrangement of its individuals within a given amount of space.
How does a population grow?
*birth rate - death rate.
**change in population = births-deaths
Reproductive potential
*this rate is limited by the maximum number of offspring that each member of the population can produce.
Exponential growth
*grows faster and faster.
*occurs when the populations have plenty of food and space with little to no competition.
Carrying Capacity
*the maximum population that the ecosystem can support indefinitely.
Resource limits
*species reaches its carrying capacity when it consumes a particular natural resource at the same rate at which the ecosystem produces the resources.
*species compete directly or indirectly
Territory
*is an area defended by one or more individuals against other individuals.
*value is for space, food, shelter and breedomg sites.
2 types of population regulation
1. density dependent
2. density independent
Niche
*the unique role of a species within an ecosystem.
*includes the species physical home, environmental factors, and interactions with other organisms.
5 interactions between 2 species
*see chart on pr. 218
1. competition
2. predation and parasitism
3.mutualism
4. commensalism
5.symbiosis and coevolution
Competition
*each species negatively affects the other
Predation and parasitism
*one species feeds on the other
Mutualism
*each species is helpful to the other
Commensalism
*one species benefits from another species, but the species is not affected.
Competiton
indirect competition