Bio171-F10-Lec 5 - Biology 171 Friday, September 17, 2010...

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Biology 171 Friday, September 17, 2010 Today’s Topics: Announcements Next Week in Discussion: Your carbon footprint Text Reading: Lecture 5: 4th: Chapter 54 (1083-1097) 3rd: Chapter 54 (1222-1237) Lecture 6: 4 th : Chapter 54 (1098-1102) 3 rd : Chapter 54 (1238-1241) Biomes Ecosystem Ecology Eutrophication 1
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BIOMES In ecology, a biome is a terrestrial ecosystem that is unique to a given climatic combination of temperature and moisture and is characterized by a distinct type of vegetation. Biomes are discernible primarily at large (continental to global) spatial scales. Collectively they comprise the Biosphere . 2
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Distinct Biomes are found throughout the world Fig. 50.10 3
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Each biome is categorized by the average annual temperature and precipitation and by the annual variation in temperature and precipitation. 4
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Found in equatorial regions where temperatures are consistently high and total rainfall is high. Characterized by extremely high diversity (hundreds of tree species). The favorable year-round growing conditions promote extremely high productivity —the total amount of carbon Fxed by photosynthesis per unit area per year— and aboveground biomass —the total mass of living plants, excluding roots. 5 Tropical Wet Forest 50.11-12
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Each biome is categorized by the average annual temperature and precipitation and by the annual variation in temperature and precipitation. 6
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Subtropical deserts are characterized by high average annual temperatures, moderate variation in temperature, and very low precipitation. Because conditions are rarely favorable enough to support photosynthesis, the productivity of desert communities is very low. Desert species adapt by growing at a low rate year-round or by breaking dormancy and growing rapidly in response to any rainfall. 7 50.13-14 Subtropical Desert
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Each biome is categorized by the average annual temperature and precipitation and by the annual variation in temperature and precipitation. 8
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In temperate grasslands (also called prairies or steppes ), temperatures are moderate and precipitation is low. The moderate annual temperature variation dictates a well-defned growing season. Grasses are the dominant plants. Although the productivity oF temperate grasslands is generally lower than that oF Forest communities, grassland soils are oFten highly Fertile. 9 50.15-16 Temperate Grassland
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Each biome is categorized by the average annual temperature and precipitation and by the annual variation in temperature and precipitation. 10
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experience a period in which mean monthly temperatures fall below freezing and plant growth stops. Unlike grassland climates, precipitation is moderately high and relatively constant throughout the year. Usually dominated by deciduous trees.
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Bio171-F10-Lec 5 - Biology 171 Friday, September 17, 2010...

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