BSsq-discuss4 biogeogr

BSsq-discuss4 biogeogr - c yield congruent area cladograms...

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BIS 1B (Winter 2008) Study questions: Biogeography Discussion 4 1. Describe the differences between ecological biogeography and historical biogeography. Choose an animal taxon as an example, and show how its distribution might be explained using these two different approaches. 2. What is a disjunct distribution? Give an example from (i) birds, and (ii) mammals. 3. What are the six major biogeographic realms recognized by biogeographers, and what is the basis for their recognition? 4. One repeated biogeographic pattern is the occurrence of taxa in eastern United States and eastern Asia, and nowhere else (alligators and tulip-trees are two examples). Give two different, general explanations for this, one relying on dispersal and the other on vicariance . Multiple choice/true false 5. The disjunct distributions of lungfish and ratite birds in South America, Africa, and Australia a. are best explained by dispersal during the Great American Interchange b. are best explained by vicariance associated with the break-up of Laurasia
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Unformatted text preview: c. yield congruent area cladograms d. provide an example of the importance of long-distance dispersal (“jump dispersal”) e. are contradicted by their fossil records 6. The species of native animals and plants living on the Galapagos Islands a. are mostly endemic to the archipelago b. reached the islands via an earlier land-bridge c. belong to the fauna of the Nearctic region d. have their nearest relatives in the Australian region e. none of the above 7. True/false? a. Marsupials are endemic to Australia. b. Porcupines and opossums are relatively recent invaders of North America, from South America. c. Armadillos and rheas are relatively recent invaders of South America from Africa. d. Cats (felids) and mustelids (skunks, weasels) expanded their ranges far south during the Great American Interchange. e. Iguanid lizards exhibit a markedly disjunct distribution, being found in the New World, Madagascar, and Fiji. 1...
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