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19 terms

Chapter 18 Key Terms

STUDY
PLAY
coevolution
reciprocal evolutionary adjustments between interacting members of an ecosystem
predation
an ecological interaction in which one organism feeds on another
parasitism
type of predation in which the predator feeds on but usually doesn't kill a larger organism
secondary compound
defensive chemical compound produced by a plant
symbiosis
ecological interaction in which two or more species live together in a close, long term association
mutualism
symbiotic association in which both partners benefit
commensalism
ecological interaction in which one species benefits and the other species is neither harmed nor helped
competition
ecological interaction between two or more species that use the same scarce resource such as food, light, and water
niche
functional role of a species in an ecosystem
fundamental niche
the entire range of conditions an organism can tolerate
realized niche
the part of its fundamental niche that a species actually occupies
competitive exclusion
local extinction of one species due to competition
biodiversity
the variety of species living within an ecosystem
climate
prevailing weather conditions in a given area
biome
major type of terrestrial ecological community, such as a grassland and desert
littoral zone
shallow zone near the shore in a freshwater habitat
limnetic zone
area in freshwater habitat away from the shore but still close to the surface
profundal zone
zone in a freshwater habitat that is below the limits of effective light penetration
plankton
biological community drifting freely in the upper waters if hte ocean and consisting mostly of microscopic organisms