Lec 3 - Welcome to BIS 2B Evolution and Ecology BIS2B, Fall...

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Unformatted text preview: Welcome to BIS 2B Evolution and Ecology BIS2B, Fall 2008 Monday Sept 25. Lecture 3. Biological Diversity, the variety of life on earth. Geographical & Functional Diversity Some of what we learned about biodiversity from the Video? a.Most species occur in at high latitude. b.High biodiversity is correlated with high latitude. c.Low latitudes are next to the ocean d.Low latitudes are where biodiversity is concentrated. e.Low latitudes are especially dangerous places. Species differ in relative abundance. Some are common, some are of intermediate abundance, some are rare. This means that rank-abundance plots slope downward, from the upper right to the lower left, from the most abundant to the least abundant species. (If all species were of equal abundance, the rank-abundance plot would be horizontal). Large sample sizes are necessary to approach the asymptote of species diversity in many ecosystems. The common species are several orders of magnitude more abundant than the rare species. This necessitates plotting log abundance versus species rank in order to visualize the relationships between the orders of magnitude. Plotting with logs to reveal orders of magnitude difference in abundance between species . Log 10 1 = 0 Log 10 2 to 10 >0 to 1 Log 10 10 to 100 ranges from 1 to 2 Log 10 100 to 1000 ranges from 2 to 3 Log 10 1000 to 10,000 ranges from 3 to 4 Log 10 10,000 to 100,000 ranges from.. You tell me! Rank Abundance plots of high species diversity. Using logs to meet the challenge of multiple orders of magnitude. Korup Forest, Cameroon. 495 species of trees. Deciduous forest. 5 species of trees....
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This note was uploaded on 04/21/2010 for the course BIS 2C BIS 2C taught by Professor Rizzo during the Winter '09 term at UC Davis.

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Lec 3 - Welcome to BIS 2B Evolution and Ecology BIS2B, Fall...

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