Bio_Lecture_8

Bio_Lecture_8 - Read: EcosystemServices Ecosystems

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Ecosystem Services Ecosystems Ecosystem: all living things in a particular place and the nonliving (abiotic)  environment in which they live o All components of an ecosystem interact with one another o Components of an ecosystem are highly interconnected o Different ecosystems are connected Ecosystems defined at different levels Salt marsh (where ocean meets lakes/rivers) [Mississippi River, Gulf of  Mexico, land… lots of interactions] Energy and matter in ecosystems Ecosystems provide services that are essential to support all life on earth o Capture and transfer of energy Energy flows  through ecosystem Earth is an open energy system o Storage and transfer of matter Matter and elements cycle  through ecosystems The right amount of matter at the right time to support Earth is a closed system with respect to matter (no matter is  ever created or destroyed, only recycled through the system) Ecosystems energy The earth is an open system with regard to energy o Constant energy from the sun o Very little energy from the sun is captured for use o Emits thermal energy into space Figure 57.10 Capture of matter and energy Autotrophs     : synthesize organic compounds from inorganic molecules o Auto = self; troph = feeding o Photosynthetic     : energy from sunlight to make organic compounds  (sugars) Read: 
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o Autolithortrophs     : oxidize inorganic compounds (H 2 S, S, Fe, H 2 ) to  obtain energy to make organic compounds Transfer of matter and energy Heterotrophs     : cannot synthesize organic compounds Live by taking organic compounds and energy from other organisms o Primary consumers: eat producers o Secondary consumers: eat primary consumers Trophic level: an energy/matter transfer level in a food chain Trophic level energy transfer Figure 57.8 How much energy is available to producers? Consumers? 2 nd  Consumers? Remember the 2
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Bio_Lecture_8 - Read: EcosystemServices Ecosystems

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