Lake Baikal in Siberia is an ancient unglaciated temperate lake and contains 580 species of bottom-dwelling invertebrates. Great Bear Lake, a comparably sized lake that is at the same latitude in northern Canada and was once glaciated, contains only four bottom-dwelling invertebrate species. This observation supports which of the following hypothesis?

Lake Baikal in Siberia is an ancient unglaciated temperate lake and contains 580 species of bottom-dwelling invertebrates. Great Bear Lake, a comparably sized lake that is at the same latitude in northern Canada and was once glaciated, contains only four bottom-dwelling invertebrate species. This observation supports which of the following hypothesis?

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Lake Baikal in Siberia is an ancient unglaciated temperate lake and contains 580 species of bottom-dwelling invertebrates. Great Bear Lake, a comparably sized lake that is at the same latitude in northern Canada and was once glaciated, contains only four bottom-dwelling invertebrate species. This observation supports which of the following hypothesis?



a) species-time

b) species-area

c) species-productivity

d) both a and b

e) both b and c



Answer: A


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