3. How Are Species Distributed Spatially v2

3. How Are Species Distributed Spatially v2 - How are...

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How are species distributed spatially?
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• Carolus Linnaeus named 12,000 in 1758 • Today, ~1.7 million species are described • Estimates of total number of species range from 3-112 million • Bottom line: We don’t know for sure, but it’s probably at least 10X the number known!
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•Terry Erwin (1982) estimated the number of arthropod species in tropical forests by fumigating individual trees in Panama and counting beetle species Estimating Global Species Diversity
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How many species are there? Norwegian microbiologists used genetic methods to identify diversity of soil bacteria Assumed that bacteria that shared <70% of DNA were separate species Found at minimum 4,000 bacteria species in each of 2 1-gram soil samples No overlap in species between samples Only ~4,000 species of bacteria described!
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•Most uncertainty occurs for small organisms Described and Estimated Species
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3. How Are Species Distributed Spatially v2 - How are...

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