BIO120H1 Lecture Notes - Lecture 3: Daniel H. Janzen, Anemophily, Convergent Evolution
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BIO120H1 Full Course Notes
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Lecture 3 - what darwin saw: a geographical perspective on biodiversity and adaptation: biogeography tried to explain why species are where they are, low species diversity where darwin was from. Megan frederickson: devil"s garden - bare ares around this plant, ants would use formic acid to kill any other plants introduced into the area, reciprocating evolution. Epiphytes: plant that grows on another plant, not parasitic, convergent evolution: independent evolution of different species to similar ecological factors. Determining the net balance of species diversity: rate of speciation vs rate of extinction. Biotic selection is less important: abiotic selection is more prominent. Line where vegetation (natural boundary) possibly because of abiotic stress whereby species reach their limit (temperature, wind, frost etc) John henslow: botanist from cambridge, steered darwin from theology to biology, was interested in species variation, told darwin to collect many individuals to view variation.
