BIO120H1 Lecture Notes - Lecture 3: Nectar, Daniel H. Janzen, Beltian Body
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BIO120H1 Full Course Notes
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Document Summary
Observations of fossils, geographical distribution of plants and animals, and flora and fauna of oceanic islands. 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 more intense. Tropical forests have high species diversity and individuals of the same species are widespread - unlike temperate forests. Tropical forests are also largely evergreen (non-deciduous) - unlike most temperate forests. Dense canopies and long-distances between trees make wind a poor agent of pollen dispersal; animals are more effective pollinators. Bees, butterflies, moths, birds, and bats pollinate most tropical trees; most temperate trees wind pollinated. Euglossine bees as long-distance pollinators of tropical plants , science (1971) Used mark-recapture techniques to demonstrate that bees travel up to 23 km during a day.
