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Animal Nutrition III (Ch. 41)

Animal Nutrition III (Ch. 41). Ruminant digestion Symbiosis Definition Algal-invertebrate Chemoautotroph-invertebrate. Hydrothermal vent H 2 S (sulfide) chemoautotrophy. Keywords. Basic parts of alimentary canal. Mechanical digestion. storage. absorption. mouth. anus.

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Animal Nutrition III (Ch. 41)

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  1. Animal Nutrition III (Ch. 41)

  2. Ruminant digestion Symbiosis Definition Algal-invertebrate Chemoautotroph-invertebrate Hydrothermal vent H2S (sulfide) chemoautotrophy Keywords

  3. Basic parts of alimentary canal Mechanical digestion storage absorption mouth anus

  4. Structure of cellulose

  5. Cecum • Allows breakdown of cellulose in herbivores • One opening and exit - lower oxygen, slower passage • Digested cellulose must be reintroduced to digestive system

  6. Ruminant digestion

  7. Ruminant 4 chambered stomach • Rumen and reticulum - where symbiotic bacteria and protists break down cellulose • Cow rechews food • Omasum - where water is absorbed • Abomasum - further digestion by cow’s enzymes

  8. Symbiosis

  9. Autotroph-invertebrate symbiosis • Symbionts are algae • Algae photosynthesize and provide molecules such as sugars to the host • Hydra, anemones, giant clams, corals

  10. Examples

  11. Chemoautotroph-invertebrate symbiosis • Symbionts are chemoautotrophic bacteria • Bacteria use hydrogen sulfide as an energy source and provide molecules such as sugars to host • Tubeworms, clams, mussels

  12. Where do we find these organisms?

  13. Life at a vent O2 H2S

  14. Respiratory surface of tubeworm H2S O2 Hb

  15. Oxygen and sulfide are transported to the bacteria

  16. Chemoautotrophy: Bacteria oxidize sulfide and use the energy for carbon fixation H2S + O2 SO4= ATP carbohydrate ADP Calvin-Benson Cycle CO2

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