Ch. 3

Ernest Haecuel
19th century scientist, developed ecology (eco–> “house”, logy–>”study” (greek))
living environment–> all organisms
nonliving/physical environment
study of the interactions between organisms and their environment
group of organisms of the same species that live together in the same area at the same time
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
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
spatially heterogeneous region that includes several interacting ecosystems
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
GROSS PRIMARY PRODUCTIVITY rate at which energy is captured during photosynthesis. primary b/c plants occupy the first trophic level
NET PRIMARY PRODUCTIVITY productivity after respiration losses are subtracted