Midterm1-spring2001-key

# Midterm1-spring2001-key - Name KEY Page 1 of 10...

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Name: KEY Page 1 of 10 Instructions: --Write your name on all the pages --Make sure that all 10 pages are attached. --You may not use calculators or other electronic aids. The math needed to solve a problem should be relatively simple. If not please give your answer by showing how you would make the calculation: e.g., showing "(10+10)/4" is as good an answer as "5" (writing down an appropriate equation and clearly defining the variables, as well as indicating their values, if known, will also suffice). --If you get hung up on a problem, skip it; return to it after you’ve answered the “easy” problems. GENERAL ECOLOGY PCB 4044 SPRING 2001 MIDTERM I PAGE POINTS POSSIBLE SCORE 2 12 _____ 3 13 _____ 4 6 _____ 5 13 _____ 6 13 _____ 7 12 _____ 8 8 _____ 9 10 _____ 10 13 _____ _____ _________ TOTAL 100 _____

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Name: KEY Page 2 of 10 1. (12 points) A plant occurs on several islands off the coast of Florida, but is absent from the mainland. a) List three hypotheses that might explain this pattern (each hypothesis should emphasize a different process). e.g., the plant is unable to disperse to the mainland; competitors (or herbivores, or seed predators, or pathogens) on the mainland prevent the successful establishment and growth of the plant; soil conditions (or climate, or related factors) on the mainland do not permit the successful establishment and growth of the plant (even in the absence of negative interactions with other species); a species that has a beneficial effect on the plant (e.g., a pollinator) is absent from the mainland (or has a smaller effect on the mainland) and this prevents the successful establishment, growth, or reproduction of the plant. b) For one of these hypotheses (indicate which one), generate a prediction derived from the hypothesis. e.g., If the plant is absent because of dispersal, then if we transplant seeds to the mainland, they should germinate, grow, survive and reproduce. If the plant is absent because of deleterious effects of other species, then if we transplant seeds to the island, they should fail to survive and reproduce, but if we transplant seeds and protect them from the other species, then they should do well. If the plant is absence because of abiotic conditions, then the plant should fail to germinate, grow, reproduce when we tranplant it. This should be true even if we exclude interactions with species that might have deleterious effects on the target species. c) Design an experiment to test this hypothesis. Include all relevant information, including details about the key components of a well designed experiment. Also be sure to mention what you will measure and what you should “see” if your hypothesis is correct (and what you should see if it is incorrect). e.g., Dispersal limitation: collect seeds from the island. Randomly allocate seeds to 10 groups, which will be equally allocated to two treatments: "island" and "mainland". The ten groups get handled similarly, except the "island" group gets planted on the island (in the habitat within which the plant normally occurs – but in plots that have been cleared
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Midterm1-spring2001-key - Name KEY Page 1 of 10...

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