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CHEMOSYNTHESIS Who’d a thunk it?. Chemosynthetic bacteria  The basis for all life at hydrothermal vents.  Archaea – very primitive, different from other.

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Presentation on theme: "CHEMOSYNTHESIS Who’d a thunk it?. Chemosynthetic bacteria  The basis for all life at hydrothermal vents.  Archaea – very primitive, different from other."— Presentation transcript:

1 CHEMOSYNTHESIS Who’d a thunk it?

2 Chemosynthetic bacteria  The basis for all life at hydrothermal vents.  Archaea – very primitive, different from other bacteria. Given their own KINGDOM.  Extremophiles.

3 Three types of bacteria at the vents:  Symbiotic bacteria – live inside worms, clams, mussels.  Plume bacteria – live in the cloudy water around the vents.  Mat-forming bacteria – cover the surfaces everywhere with a slimy layer of them.

4 Symbiotic bacteria live inside tubeworms, clams, and mussels, in a relationship that is mutually beneficial to each. “You scratch my back and I’ll scratch yours.”

5 Chemosynthesis  Energy source is H 2 S (hydrogen sulfide), an energy-rich compound that releases energy when it oxidizes.  No sunlight required!  Uses hydrogen from H 2 S, carbon dioxide and oxygen to make simple sugar.

6 Photosynthesis vs. Chemosynthesis Photosynthesis  Light energy (sun)  Chlorophyll needed  CO 2 + H 2 O -> C 6 H 12 O 6 + O 2  (Oxygen is a product / Water is a reactant.)  Any cells with chlorophyll (plants, phytoplankton, algae, and some bacteria) can photosynthesize.  Basis of most energy webs on Earth. Chemosynthesis  Chemical energy (H 2 S)  Chlorophyll not required  CO 2 + H 2 S + O 2 -> CH S + H 2 O  (Water is a product / Oxygen is a reactant.)  Only a few types of bacteria able to chemosynthesize.  Basis of energy webs at hydrothermal vents.

7 What do photosynthesis and chemosynthesis have in common?  Both produce simple carbohydrates (food).  Both require CO 2 as the carbon source.  Both supply the energy to sustain many other forms of life through food webs.

8 Hard to imagine, but the sun could die out tomorrow, and chemosynthetic bacteria and all the other animals in their ecosystems wouldn’t even know the difference.

9 Interestingly, chemosynthetic bacteria using hydrogen sulfide as “fuel” have been found other places besides hydrothermal vents.  Hot springs on land.  Cold seeps.  Whale carcasses deep on the ocean floor.  Sunken ships.  Even in caves. Click for video 5:24 Click for video 5:24  And other types of chemosynthetic bacteria (using compounds besides hydrogen sulfide) are also found in wetlands, intestines of some animals, and in the soil.


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