Ecology AP Biology Flashcards

9363504719	Exponential population growth	Growth of a population in an ideal, unlimited environment, represented by a J-shaped curve when population size is plotted over time.	0
9363504720	Logistic population growth	Population growth that levels off as population size approaches carrying capacity.	1
9363504721	K-selection	Also called density-dependent selection. Characterized by few offspring with little or much parental care.	2
9363504722	R-selection	Also called density-independent selection. Characterized by many offspring with little or no parental care.	3
9363504723	Density independent	Limiting factor that affects all populations in similar ways, regardless of population size. fires, floods, extreme cold	4
9363504724	Density dependent	Limit the population growth only when the density reaches a certain level - competition, parasitism, predation	5
9363504725	Ecological niche	all of the physical, chemical, and biological factors that a species needs to survive, stay healthy, and reproduce in an ecosystem	6
9363504726	Symbiosis	A close relationship between two organisms in which at least one of the organisms benefits	7
9363504727	Parasitism	A relationship between two species in which one species benefits from the other species, the host, which is harmed	8
9363504728	Mutualism	A symbiotic relationship in which both organisms benefit	9
9363504729	Commensalism	A relationship between two species in which one species benefits and the other is neither helped nor harmed	10
9363504730	Facilitation	An interaction in which one species has a positive effect on the survival and reproduction of another species without the intimate association of a symbiosis	11
9363504731	Trophic structure	The different feeding relationships in an ecosystem, which determine the route of energy flow and the pattern of chemical cycling	12
9363504732	Biomass	Total amount of living tissue within a given trophic level	13
9363504733	Detritivores	feed on plant and animal remains and other dead matter	14
9363504734	Eutrophication	excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.	15
9363504735	Trophic efficiency	the percentage of production transferred from one trophic level to the next usually 10%	16