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attachment-7.ashx - Handout for Chapter 28 How do...

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Handout for Chapter 28 – How do ecosystems work? Once again, a reminder of where we are in the hierarchy Communities of species do not exist in isolation of the world around them. Consideration of abiotic components is essential the two most important components that ecologist study areL - energy -nutirents (carbon, nitrogen, water, etc) Now it is time to consider the abiotic components of a community (the ecosystem) Energy in ecosystems – the big picture Found in a variety of forms -Light, heat, chemical bonds, etc. Flows in a one-way pattern → to Earth, through an ecosystem and then is lost back to atmosphere (heat) Not recycled, must be constanty replenished from outside (the sun) Nutrients in ecosystems as a source of energy Large molecules (nutrients like carbs, proteins, lipids, etc) represent a source of energy for living organisms (calories) But they also contain elements (nitrogen, carbon, etc) and these are recycled over and over. Energy flow Energy enters ecosysten via sunlight Photosynthetic organisms capture energy in sunlight using photosynthesis (PS) -plants, algea, some prokaryotes. Energy in sunlight used to make sugars (carbs)
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attachment-7.ashx - Handout for Chapter 28 How do...

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