BIO120H1 Lecture Notes - Lecture 12: Richard Lenski, Phenology, Phylogenetic Diversity
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Trillium threatened because of housing development. Global problems: global warming and climate change, loss of biodiversity, environmental pollution, human famine, spread of infectious diseases, human population growth. Greenhouse gas emissions: some still deny climate change, keeling measured co2 in hawaii and it keeps increasing. Responding to climate change: migration e(cid:272)ologi(cid:272)al respo(cid:374)se (cid:449)hi(cid:272)h is tough if (cid:455)ou"re o(cid:374) a (cid:373)ou(cid:374)tai(cid:374) or a(cid:374) island, adaptive radiation (evolution) genetic variation is necessary for this, go extinct (evolution) This was because of drought: evidence for directional selection for early flowering in both populations; he demonstrated selection, he collected seeds each year (richard lenski) and because these can be stored, he compared them (1997 vs 2004). Grew them in a greenhouse, crossed them: he found that at black bay they flower 1. 9 days earlier compared to 8. 5 days earlier at arboretum. Two elements of biodiversity; interspecific variation or species diversity (ecologists) and intraspecific variation or genetic diversity (geneticists)
