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esp1-2 - Ecosystems their cycles and the role of humans ESP...

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Ecosystems, their cycles, and the role of humans ESP 1 Prof. Baskett 4/1/10
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What is environmental science? science Science : “Knowledge or a system of knowledge covering general truths or the operation of general laws especially as obtained and tested through scientific method” (Merriam-Webster dictionary) Identify pattern or problem Formulate hypothesis Design experiment Test hypothesis Analyze results Formulate conclusions
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What is environmental science? environment Environment : Surrounding biotic (living) and abiotic (non-living) influences, including humans
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Ecosystems Biosphere Hydrosphere Geosphere Atmosphere Anthrosphere Ecosystems
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Outline Biosphere Hydrosphere Geosphere Atmosphere Anthrosphere Ecosystems Ecosystem linkages: cycles • Energy • Water • Carbon • Nitrogen Human-natural system linkages: Anthropogenic impacts Take-home message Different components of ecosystems, including humans, are deeply linked Not exhaustive
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Outline Biosphere Hydrosphere Geosphere Atmosphere Anthrosphere Ecosystems Ecosystem linkages: cycles • Energy • Water • Carbon • Nitrogen Human-natural system linkages: Anthropogenic impacts
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Energy cycle: food webs Biosphere Hydrosphere Geosphere Atmosphere Anthrosphere Habitat
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Human impacts on food webs: extraction Jackson et al. 2001
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Human impacts on food webs: contaminants Bioaccumulation & Biomagnification Heavy metals Pesticides
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Human impacts on food webs: contaminants Heavy metals Pesticides Sources: UWisc-Ex, USGS Bioaccumulation & Biomagnification
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Anthropogenic energy sources As organisms: Food For our activities: Fossil fuel Biofuel Solar Nuclear Wind Hydro Geothermal Wave etc.
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