WLDM Test 2 Section 2
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a network involving the interactions of living and non-living elements in a manner that sustains life:
What does management do to ecosystems?
manipulates parts of ecosystems and communities
where do ecosystems get energy?
- from the sun
- its self-sustaining
Are food chains 100% efficient?
no, about 10%
Where is less energy available?
the further you move up the food chain/web
the functional role/occupation of an organism in its environment:
What happens when niches overlap?
a worldwide grouping of communities having similar vegetation:
What are the types of desert?
- hot & dry
What are the types of forests?
- temperate (normal temperatures)
- tropical (close to equator;warm and wet)
- boreal (located in the north; cold for long periods)
What are the types of grasslands?
- tropical (savannas)
- temperate (largest biome in NA; fertile; used for cropland)
What are the types of tundra?
the orderly progression through time of changes in community composition, usually described in terms of plant life:
What is primary succession?
not previously vegetated
What is secondary succession?
sites previously vegetated
What is a pioneer community?
first community after a disturbance
number of species in a community:
relative constancy in the abundance of populations:
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