18 terms

Chapter 3 - Communities and Biomes

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climax community
a stable, mature community that undergoes little or no change in species over time
limiting factor
any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms.
primary succession
the colonization of barren land by pioneer organisms
secondary succession
sequence of changes that take place after a community is disrupted by natural disasters or human actions.
succession
orderly, natural changes, and species replacements that take place in ecosystem communities over time.
tolerance
the ability of an organism to withstand fluctuations in biotic and abiotic environmental factors
aphotic zone
deeper water that never receives sunlight
biome
group of ecosystems with the same climax communities
desert
arid region with sparse to almost nonexistent plant life
estuary
A coastal body of water, partially surrounded by land, in which freshwater and saltwater mix
grassland
biome composed of large communities covered with rich soil, grasses, and similar small plants
intertidal zone
the portion of the shoreline that lies between the high and low tide lines
photic zone
Portion of the marine biome that is shallow enough for sunlight to penetrate.
plankton
small organisms that drift and float in the waters of the photic zone
taiga
biome just south of the tundra; characterized by a northern coniferous forest composed of pine, fir, hemlock, and spruce tree and acidic, mineral-poor topsoils
temperate/deciduous forest
biome composed of forests of broad-leaved hardwood trees that lose their foliage annually
tropical rain forest
biome near the equator with warm temperatures, wet weather, and lush plant growth
tundra
Biome that surrounds the north and south poles; treeless land with long summer days and short periods of winter sunlight, beneath the topsoil is a layer of permafrost.