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Environmental Science (MindTap Cou...

16th Edition
G. Tyler Miller + 1 other
ISBN: 9781337569613

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BuyFindarrow_forward

Environmental Science (MindTap Cou...

16th Edition
G. Tyler Miller + 1 other
ISBN: 9781337569613
Textbook Problem

The following table is a sample of a very large body of data reported by J. P. Collins, M. L. Crump, and T. E. Lovejoy HI in their book Extinction in Our Times–Global Amphibian Decline. It compares various areas of the world in terms of the number of amphibian species found and the number of amphibian species that were endemic, or unique to each area. Scientists like to know these percentages because endemic species tend to be more vulnerable to extinction than do non-endemic species. Study the table below and then answer the following questions.

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Fill in the fourth column to calculate the percentage of amphibian species that are endemic to each area.

To determine

The percentage of endemic amphibian species in each area of the given data.

Explanation
AreaNumber of speciesNumber of endemic speciesPercentage of endemic species
Pacific/Cascades/Sierra Nevada Mountains of North America5243

    4352×100%=82.6%

Southern Appalachian Mountains of the United States10137

    37101×100%=36.6%

Southern Coastal Plain of the United States6827

    2768×100%=39.7%

Southern Sierra Madre of Mexico11874

    74118×100%=62

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