BIO120H1 Lecture Notes - Lecture 3: Daniel H. Janzen, Duroia, Temperate Climate
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BIO120H1 Full Course Notes
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Document Summary
Observe fossils, distribution of plants and animals, flora and fauna of oceanic islands. Very high species diversity of plant and animal groups compared to temperate zone. Biotic interactions more important in tropics (than temperate) Year round warmth rapid growth insect and microbe population: pest and disease pressure on plants more intense. Animal pollination key in tropics (not wind) Dense canopies and long distances mean animals better pollinators: bees butterflies birds bats. Bees, moths, hummingbirds, long distance during trapline foraging. Further seedlings get from parent, more likely to survive: get away from parent is good strategy. Relationship with ants: ants get sugar, protein, and home. Tree without ants gets defoliated: recruited ants to protect tree. Once competitors are around, duroia growth slowed. Intense herbivory in tropical ecosystems results in considerable damage and consumption of plant biomass. Common in tropics: increase species diversity. Epiphytic life from evolved independently in many unrelated families convergent evo.
