BIOL 103 Lecture Notes - Semelparity And Iteroparity, Natural Selection, Life Table
23 Mar 2013
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Document Summary
Rare example of exponential population growth when four males and 22 female reindeer introduced to alaskan island, grew to over 2000 in 30 years, overgrazed habitat and population crashed to 8 animals by 1950. At the peek, the population exceeded carrying capacity of the island. Near the end of the graph, there was no food because the environment was overgrazed i-clicker question: some organisms have peculiar population cycles, such as the various species of periodic cicadas, with species that emerge only every 7, 13, 17, or 19 years from below ground. This might be since these are all prime numbers, it reduces the likelihood a predator population can track them with an overlapping cycle of it"s own. Two or more species with interacting populations can give complex patterns; some populations are stable while other fluctuate and crash: food supply and predators may cause a steep decline.
