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Final Exam

Population Ecology - abundance of individuals - dynamics of the population - density, dispersion, demographics
Population Density The number of individuals per unit area or volume
Pattern of dispersion Refers to how individuals are spaced relative to one another
Three types of dispersion 1. Random 2. clumped 3. Uniform
Pattern of dispersion: Clumped - Patchiness in resources - family groups - reduce risk of predation
Pattern of Dispersion: Uniform - aggressive interactions - competition
Population Dynamics - 4 primary factors that influence population size - How do these factors affect the rate at which popultions change?
4 primary factors that influence population size - births - deaths - immigration - emigration
Survivorship curve a graphic way of representing the data in a life table
Life History - The age at which reproduction begins - How often the organism reproduces - How many offspring are produced during each reproductive cycle
K-selection density-dependent selection, selects for life history traits that are sensitive to population density
r- selection density- independent selection, selects for life history traits that maximize reproduction
Factors Influencing Population size - density dependent - density independent
density dependent density of population alters the effect of an environmental condition
density independent effect of an environmental factor is not affected by the density of a population
Density- dependent factors - competition: interaction in which individuals try to use the same resource
Metapopulations - environments are heterogeneous - not all patches are equal
Species range - potential - actual
Species range: potential - limited by tolerance to abiotic conditions - light - temp - precipitation - soil (geology) - salinity - pressure
Species range: actual - Limited by biotic conditions and abiotic conditions - intraspecific/ intra specific competition - predation - symbiosis
climate - temperature, water, sunlight, and wind - long-term prevailing weather conditions - macroclimate - microclimate
What determines climate? - latitude - tilt of the earth - ocean currents - wind patters - proximity to coast - mountains
Biomes major ecological associations that occupy broad geographic regions of land or water
Created by: savepeople