Vocabulary for Case 2
Biodiversity: Variabilityamong livingorganismsfrom all sources. Includes diversitywithinspecies,
between species and within ecosystems. Scales geneticbiodiversity, speciesbiodiversityand
Species richness: The number of species present in a certain area. When a curve counting number of
new species found beginsto leveloff as more and more sections of the area are surveyed, the
species richness is saidto be determined.
-When a graph levelsout, species richness is said to be SATURATED.
Species abundance:How common a speciesis in a defined area.
Relative abundance:Compares the abundance of different species. Determines how even the
number of individualsin different species are. A low relativeabundance correlates with a lot of
individualsin one speciesand not very manyin another. Low relativeabundance=low evenness.
Abiotic: Non-livingfactors of an environment, such as physical and chemical features of an
temperature, water, gases and soil.
Biotic: Living factors of an environment, defining three categories
Producers: Plants that convert sun energy into food
Consumers: Organismsthat eat other plants and/or animals.
Decomposers: Bacteria or fungi that feed off dead things to makelargeorganic moleculessmaller.
Population:The collection of individualsof a singlespecies within an area at a certain point in time.
Population ecology studies population density, patterns of dispersion, agedistributions, population
growth and population size.
Population Growth: The change in the number of individualsduring a period of