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Unit 13


Ecological Niche Manner in which organisms make use of resources and are influenced by the conditions of their habitat
Habitat Type of environment in which an organism lives
Physical Adaptations Genetically inherited characteristics that enable a give organism to survive and reproduce using a given niche
Niche partitioning The divisions of niches such as to cut down on competition
Competition Antagonistic struggle for a resource. Always produces nothing but loses.
The competitive exclusion principle (Gause's Principle) No two species can use the same niche at the same time and place, one to the other or both will be out competed.
Interspecific competition Between different species
Intraspecific competition Within a species More common
S-shaped Curve Logistic Growth- relationship to supply Lag, accelerate, decelerate, equilibrium, carrying capacity is dotted line
J-shaped Curve Exponential growth rate- at a fixed rate per time period 1) lag, accelerate 2)Lag, accelerate, maximum stationary phase, crash phase, carrying capacity is dotted line
What inevitably happens to populations that undergo a prolonged j-shaped growth? The population overshoots their carrying capacity and crashes



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