BIO SCI 1A Lecture Notes - Lecture 10: Population Genetics, Linnean Society Of London, Her Majesty'S Ship
5 Mar 2016
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Malthus picked up on the concept of carrying capacity, darwin brought the idea together. Beak sizes of finches are adapted to wet years v. dry years. Some details on the galapagos finch study 1. Good science: long-term study began in 1973 peter and rosemary grant and students. Resorted to larger seeds when smaller ones were hard to find. Birds were adapting based on what was happening that year. Harder shells during dry years, not as hard shells during wet years. Lean times: few of either kind of seed available. In dry years when hard seeds available, beak size increases. When many seeds available, smaller beak size increases. It takes more energy to produce a large peak than a small beak. Dramatic dry year: population drops from 1200 to 200 mostly females survive. Natural selection edits out those with small beaks. Two varieties of moth: one light, one dark. Habits: feed at night on trees, rocks with lichens (fungi) on them.
