L19 community ecology

L19 community ecology - BILD 3 July 21, 2010 Woodruff:...

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Unformatted text preview: BILD 3 July 21, 2010 Woodruff: community ecology 1 BIOSPHERE BIOMES MEGA-COMMUNITIES Biomes: major ecological associations occupy broad geographic regions Biomes usually grade into each other, without sharp boundaries in areas called ecotones Major terrestrial biomes Tundra Chaparral Coniferous forest Savanna Temperate broadleaf deciduous forest Temperate grassland Desert Tropical rain forest LE 50-19 Temperate grassland Tropic of Cancer 30N Tropic of Capricorn 30S Equator Tropical forest Desert Savanna Key Chaparral Coniferous forest Temperate broadleaf forest Tundra High mountains Polar ice Fig. 52-20 Tropical forest Temperate grassland Desert Temperate broadleaf forest Northern coniferous forest Arctic and alpine tundra Annual mean temperature (C) Annual mean precipitation (cm) 30 15 0 0 15 100 200 300 400 Fig. 52-21h Tundra 20% of land, permafrost, very short summer, migration, hibernation, global warming Tundra-Taiga ecotone: muskeg sphagnum moss bog BILD 3 July 21, 2010 Woodruff: community ecology 2 Arctic vs alpine tundra: altitudinal gradient Mt. San Jacinto, CA Fig. 52-21f Coniferous forest Boreal forest Taiga Fig. 52-21g Broadleaf deciduous forest Fig. 52-21e Sheyenne National Grassland in North Dakota Fig. 52-21d An area of chaparral in California Fig. 52-21c A savanna in Kenya BILD 3 July 21, 2010 Woodruff: community ecology 3 Fig. 52-21b A desert in the southwestern United States Desert, Arizona Fig. 52-21a A tropical rain forest in Borneo Major aquatic biomes: Lakes (lentic = still) Wetlands Streams and rivers (lotic = flowing) Estuaries Mangroves Intertidal zones Oceanic pelagic biome Coral reefs Marine benthic zone incl. hydrothermal vent communities Oligotrophic Eutrophic LE 50-16a Zonation in lake: light, depth, temperature, distance from shore Benthic zone Pelagic zone Aphotic zone Photic zone Littoral zone Limnetic zone BILD 3 July 21, 2010 Woodruff: community ecology 4 Winter O2 (mg/L) 12 Lake depth (m) 24 16 8 8 4 0 O2 concentration High (>8 mg/L) Medium (48 mg/L) Low (<4 mg/L) O2 (mg/L) 12 Lake depth (m) 24 16 8 8 4 0 O2 (mg/L) 12 Lake depth (m) 24 16 8 8 4 0 O2 (mg/L) 12 Lake depth (m) 24 16 8 8 4 0 Autumn Summer Spring Thermocline 4C 5 6 8 18 20 22 4C 4 4 4 4 4 4C 4 4 4 4 4 4C 4 4 2 0 4 Lakes are sensitive to seasonal temperature change and deeper lakes experience seasonal turnover Thermocline between epilimnion and hypolimnion...
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This note was uploaded on 07/28/2010 for the course BIOLOGY BILD 3 taught by Professor Davidwoodruff during the Summer '10 term at San Diego.

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L19 community ecology - BILD 3 July 21, 2010 Woodruff:...

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