BILD Community Scology

BILD Community Scology - CHP 19 14 May 2008 General...

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CHP 19 14 May 2008 Woodruff: community ecology 1 General Features of Biomes • Biomes: major ecological associations occupy broad geographic regions • Biomes usually grade into each other, without sharp boundaries • The area of intergradation, called an ecotone, may be wide or narrow Major terrestrial biomes: –Tundra –Coniferous forest –Temperate broadleaf forest –Temperate grassland –Chaparral –Savanna –Desert –Tropical forest LE 50-19 Temperate grassland Tropic of Cancer 30°N Tropic of Capricorn 30°S Equator Tropical forest Desert Savanna Key Chaparral Coniferous forest Temperate broadleaf forest Tundra High mountains Polar ice LE 50-18 Temperate grassland Tropical forest Desert Temperate broadleaf forest Coniferous forest Arctic and alpine tundra Annual mean precipitation (cm) A n u a l m e t p r ( ° C ) 400 300 200 100 30 15 0 –15 Tundra
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CHP 19 14 May 2008 Woodruff: community ecology 2 Coniferous forest [= taiga, boreal forest moose–spruce biome] Temperate deciduous forest Temperate grassland Chaparral Savanna Desert
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CHP 19 14 May 2008 Woodruff: community ecology 3 Tropical Rainforest • Major aquatic biomes: – Lakes (lentic = still): – Wetlands – Streams and rivers (lotic = flowing) – Estuaries – Mangroves – Intertidal zones – Oceanic pelagic biome – Coral reefs – Marine benthic zone LE 50-16a Zonation in lake: light, depth, temperature, distance from shore Benthic zone Pelagic zone Aphotic zone Photic zone Littoral zone Limnetic zone LE 50-13 Winter O2 (mg/L) 12 Lake depth (m) 24 16 8 8 4 0 O2 concentration High (>8 mg/L) Medium (4–8 mg/L) Low (<4 mg/L) O2 (mg/L) 12 24 16 8 8 4 0 O2 (mg/L) 12 24 16 8 8 4 0 O2 (mg/L) 12 24 16 8 8 4 0 Autumn Summer Spring Thermocline 4°C 18° 20° 22° 4°C 4°C 4°C Lakes are sensitive to seasonal temperature change and
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This note was uploaded on 12/03/2008 for the course BILD BILD3 taught by Professor Henterheather during the Spring '08 term at UCSD.

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BILD Community Scology - CHP 19 14 May 2008 General...

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