36-Communities

36-Communities - Fact of the day Food Supplies! New...

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Fact of the day Food Supplies! New Projection Shows Global Food Demand Doubling by 2050 Credit: USDA-ARS New ways of meeting demand for food need to be explored Crop yields for wealthier vs. poorer nations were more than 300 percent higher in 2005 Scientists David Tilman, Jason Hill of the University of Minnesota & colleagues found that producing the amount of food needed could significantly increase levels of CO2 and Nitrogen in the environment, and may cause increasing rates of extinctions. These problems can be avoided, they say, if the high-yielding technologies of wealthier nations are adapted to work in poorer nations, and if all countries use nitrogen fertilizers more efficiently.
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Views of the community Old = Super-organism emergent properties (like ability to withstand drought). may be related to stability or functioning of comm. New = Chance association of species result of interactions between ind. species and the environment (biotic & abiotic factors) and with chance historical events
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90° 60° 45° 30° -30° -45° Latitude Tundra Temperate coniferous forest Prairie Temperate deciduous forest Savanna Desert and semi-desert Tropical forest
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Terrestrial Communities Other biomes Not all communities fit neatly into the six major biomes Mediterranean habitat There are characteristic regions where one type of biome grades into another Pine barrens Mountains
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Aquatic Communities Marine habitats Most extensive, uniform environment Marine habitats are found over ¾ of Earth
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Aquatic Communities Marine Communities (2 subjective ways to classify) Communities by oceanic region Neritic zone: shallow regions over the continental shelves Oceanic or pelagic zone: open ocean, which may reach great depths Benthic zone: sea floor
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This note was uploaded on 12/16/2011 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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36-Communities - Fact of the day Food Supplies! New...

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