Ch. 3

Ernest Haecuel
19th century scientist, developed ecology (eco–> “house”, logy–>”study” (greek))
biotic
living environment–> all organisms
abiotic
nonliving/physical environment
ecology
study of the interactions between organisms and their environment
populations
group of organisms of the same species that live together in the same area at the same time
communities
all populations of different species that live and interact together within an area at the same time. >characterized by the number and kinds of species living there
ecosystem
includes all the biotic interactions of a community and the interactions between the organisms and their abiotic environment.

includes networks of energy flow

landscape ecology
sub-discipline of ecology that studies ecological processes that operate over large areas
landscape
spatially heterogeneous region that includes several interacting ecosystems
biosphere
layer of the earth containing living organisms
trophic level
organisms position in a food chain determined by its feeding relationships
food web
representation of the interlocking food chains that connect all the organisms in an ecosystem
pyramid of numbers
shows # of organisms at each trophic level in a given ecosystem
pyramid of biomass
illustrates total biomass at each trophic level
GPP
GROSS PRIMARY PRODUCTIVITY rate at which energy is captured during photosynthesis. primary b/c plants occupy the first trophic level
NPP
NET PRIMARY PRODUCTIVITY productivity after respiration losses are subtracted