BIO120H1 Lecture Notes - Lecture 3: Daniel H. Janzen, Temperate Climate, Her Majesty'S Ship
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BIO120H1 Full Course Notes
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Lecture 3 what darwin saw on the beagle; a geographical perspective on. Biodiversity and adaptation: contrasts between tropical & temperate ecosystems, the role of biotic and abiotic interactions in temperate and tropical ecosystems, respectively, galapagos islands as evolutionary laboratories, australia"s isolation and its unique biota. Observations of fossils, geographical distribution of plants and animals, and flora and fauna of oceanic islands. Beagle sails to brazil (tropical forests in brazil): Very high species diversity of plant and animal groups compared with temperate zone. Many more biotic interactions, especially coevolved mutualisms between plants and animals. Year-round warmth results in rapid growth of insect and microbial populations. Pest and disease pressures on plants are more intense. Creates a greater chance for natural selection. Species become isolated and unable to reproduce and survive (too many different species) E. g. trees (animals now help trees as the dominate form of pollination) Tropical trees are largely animal-pollinated whereas temperate trees are mostly wind pollinated:
