Chapter 39: Biomes

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Biology

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37 Terms

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Biomes
Major type of ecosystem charectorized by a specific climate or species composition.
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Summer
hemisphere tilts toward the sun
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winter
Hemisphere tilts away from sun
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Equator
warm water evaporates, rises, and forms clouds, then rain = tropical rain forests
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30°latitude
cool, dry air descends, absorbing moisture from the land deserts
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60°latitude
warm air mass causes precipitation over the midlatitudes = temperate biomes
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Tropical rain forest
-Climate: Warm and wet.
-Plants/Animals: high species diversity.
-destruction threatens indigenous people and global water and carbon cycles.
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Temperate forest
-Climate: Warm summers, cool winters, consistent rainfall.
- Plant/Animals:Trees and migratory animals are common.
-30°and 60° North latitude
-large areas between 30°and 60° North latitude
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Temperate deciduous forests
dominated by trees that shed their foliage in autumn,
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temperate coniferous forests
mostly evergreen conifers that lose only a few leaves at a time.
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Taiga (boreal forest)
-Climate: Cold and relatively dry.
-Seasons:
*long, harsh winter, >six months, -> growing season short.
*Moisture can be scarce in winter, water remain frozen.
-Plants: evergreen trees.
-Animals: mammals and birds stay year-round.
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Tropical savanna
-Climate: Warm year-round with wet and dry seasons
-Plants: Trees or shrubs, Perennial grasses, Patches of drought- and fire-resistant trees and shrubs
-Animals: Herds of grazing animals
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Temperate grassland
-Climate: moderately moist
-Seasons: hot summers and cold winters
-Plants: few if any trees due to insufficient rainfall, grazing, and fire.Wind-pollinated grasses dominate this biome along with large grazing herbivores.
-Animals: Grazing Herbavoirs
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Desert
-Climate: All deserts—cold and hot—are dry
-Location: 30° North and South latitudes
-Soil low in organic matter
-Plants: adapt to store water
-Animals:Nocturnal animals
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Mediterranean shrubland
-Seasons: Hot, dry summers and cool, moist winter suceptible to fire in summer
-Plants: resistant to fire and are drought tollerant
-Animals: Jack rabbits, mule deer, and coyote
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Tundra
-Climate: Very Cold, Little moisture
-Plants: permafrost > limits small plants
-Animals: caribou and fox have very thick fur
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Polar ice
-Climate: Extreamly cold, dry and windy
-Plants: phytoplankton
-Animals: Shared characteristicsin northern and southern
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Northern ice cap
thin ice layer that covers the Arctic Ocean
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Antarctica
southernmost continent
is a landmass covered with a thick layer of ice.
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Standing water
Lakes and ponds
-primary producers: phytoplankton
-consumers: Zooplankton and fish
-bacteria common
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photic zone
Light penetrates and where photosynthesis occurs
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littoral zone
Part of photic zone
shallow shoreline region where rooted plants occur
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limnetic zone
Part of photic zone
open water where light penetrates
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profundal zone
Deep water where light does not penetrate.
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benthic zone
the sediment at the bottom of standing water
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oligotrophic
if they are nutrient-poor and have low productivity. The water is clear because phytoplankton aren’t abundant enough to cloud the water.
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Eutrophic
surface water is nutrient-rich and has high productivity. The rich algal growth turns the water green and murky. A eutrophic lake eventually fills completely with sediments and transforms into a freshwater wetland
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Streams
carry running water
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Rivers
the largest streams.
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Estuaries
nutrient-rich areas where a river meets an ocean. Organisms must tolerate extreme shifts in salinity.
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Intertidal zones
area between high and low tide marks
Organisms that inhabit these zones must be able to withstand both exposure to the atmosphere and being submerged in salt water.
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Coral reefs
large underwater structures comprised of calcium carbonate built by coral animals
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neritic zone
water between the coast and the edge of the continental shelf.
abundant sunlight
sediment contribute to nutrition -> high primary producers
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oceanic zone
water beyond the continental shelf
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continental shelf
an area that is sometimes dry land but is currently relatively shallow sea
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Benthic Zone
Sediment at the bottom of the ocean
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Pelagic Zone
All of the water above sea floor
Photic zone and Profundal zone