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Basic Ecology 2

trophic levels, pyramids, tropical rain forests

Major trophic levels producers (plants) - primary consumer (eat plants) - secondary consumer (eat primary consumers) - tertiary consumer (eat secondary consumers)
shows who eats who, ocean food webs more complex then terrestrial ones, food chain is a simplified version food web
Energy flow in food web only 10% of the usable energy is transferred (most lost as heat)
shows the amount of biomass at levels within an ecosystem biomass pyramid
shows the number of organisms at levels within an ecosystem numeric pyramid
amount of biomass produced per unit time, most productive systems on earth include coral reefs, tropical rainforests, estuaries, marshes; least productive include tundra, desert, open ocean productivity
total amount of energy produced by autotrophs gross pyramid production
gross primary production minus energy used by plants themselves, this is the amount available to primary consumers net primary production
place where an organism lives habitat
role an organism plays within its environment, who it interacts with, etc. Niche
behavior where animals defend an area containing resources territoriality
no two species can occupy the same niche competitive exclusion principle
tropical rainforest characteristics shallow, nutrient poor soils (most nutrients tied up in biomass – trees, etc), being rapidly destroyed
reasons for tropical rainforest destruction logging, cattle ranching, farming, mining (building roads into forests speeds their decline)
Reasons to preserve tropical rainforests intrinsic value (value in its own right, right to live principle), potential source of medicines, role in climate regulation, economic value
solutions to preserve tropical rainforests ecotourism, give local people a stake in preservation
method used to clear tropical forests, cut trees, then burn Slash and burn agriculture
epiphytes generally plants which get their nutrients from the air and grow on trees but are not parasitic
Created by: FHSAPES