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									CO 32



        Feeding and Digestion
               Heterotrophy

1. Absorption across the body surface
    • Endocytosis (intracellular)
        • Endoparasites (flat worms)
        • Protozoans
2. Suspension (filter) feeding
    • Sieve and Mucus
        • Widely Evolved- sponges to whales
        • Analogous Structures
               Convergent Evolution
3. Fluid feeding (Ectoparasites)
        • Cutting and Licking
                cyclostomes, vampire bats, biting insects
        • Piercing and Sucking
                mosquito, leech, Hemiptera (plant sap)
4. Food Masses:
   A. Carnivory
       • Locate Prey
       • Seizing Prey
          • Stun prey (evolved countless times)
             nematocysts, electric fish, cone snails, spiders
             scorpions, reptiles, shrew
          • Mouth parts/ limbs to grasp prey
          • Masticate or swallow whole
   B. Herbivory
      • Advantages: Food Abundant, easy to “catch”
      • Disadvantages
         • Low food quality, digestability, eg. cellulose,
         • Plant secondary compounds – alkaloids
                poisons, drugs
Animal of the Day
 Coptotermes sp.
    (termite)

Phylum Arthropoda
 Class Insecta
    Order Isoptera
        Family Rhinotermidae
Termites: xylophagy
Obligate anaerobic flagellates (acetogenic)
Nitrogen Fixing Bacteria
1014g methane, 1016g CO2 / year
       (5-40% of global production)
Fig. 32.1a
Fig. 32.1b
Fig. 32.1c
Fig. 32.1d
Fig. 32.1e
      Digestion

I. Intracellular –
      endocytosis
II. Extracellular
    Secretion
    Motility
    Digestion
    Absorption
Fig. 32.7




      Intracellular Digestion
Fig. 32.8
Fig. 32.9
Fig. 32.13
Fig. 32.14
Fig. 32.15

								
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