BIO 106 Lecture Notes - Lecture 7: Doubling Time
28 Sep 2016
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Wilson estimates the actual number is between 5-100 million. 10% known to man: rivet hypothesis. An ecosystem that loses species is like an airplane which gradually loses its rivets. Once enough species are lost, an ecosystem can suddenly collapse: important rivets. Keystone species: if this species is ruined, the entire species falls apart. Coyote, flying fox, fig trees, snow geese: population. The number/estimation of specimens left in their natural habitat: exponential growth. The understanding that if a species is in a habitat with little competition, the population will grow exponentially as each generation continues to reproduce: humans as a quintessential example. Once we reached the era of modern medicine. Doubling time measures how fast the population is growing. Often occurs when species move into a new area. The maximum population of a species that can survive in a ecosystem. Wednesday, september 28, 2016: limited by food and water sources, land and habitat size.
