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Study Questions for Midterm 3

Study Questions for Midterm 3 - Why would highly connected...

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Why would highly connected and/or species rich (1& 2) be harder to invade? 1. If there are more interspecific interactions, then any species trying to invade will be subjected to greater intensities of competition from individuals at the same trophic level. It will be harder to find an empty predator niche-for instance, or apparent competition among prey may also increase. 2. It seems that species # also decreases the # of ways to be a successful invader, but it is not clear why. One possibility is that there are fewer ways to invade since there seems to be limits on the # of trophic levels, as indicated by Cohen's cascade hypothesis (don't get confused!!!). If this is true, then we simply can't add a species to the top of a chain to avoid competition. Any species that tries to insert itself will face at least competition (if it adds to the top level) or competition + predation (if it inserts into a lower level). Thus, just like competition , predation , and diversity , and succession , non-equilibrium conditions in island processes may be just as important as equilibrial conditions, and the existence of equilibrium should not be assumed automatically. community persistence . Your book describes several methods for determining primary productivity, and I encourage you to read this material. Recall that in our simulations of food webs we could not build an infinitely big web by continuing to add more predator levels. That reflects energy limitations. R n k Succession Coevolution Diversity Competition Really, the life-history theory that we covered previously provides an excellent explanation for how competition acts in succession, Basically, species exist on a continuum of early (pioneer) to late (climax) species MC Life Table dn/dt Life Hist Essay Total 30 points 15 points 15 points 15 points 25 points 25 7 12 11 15 70 MC Food web Sucession Islands Essay Total (30) (15) (15) (15) (25) (100) 20 8 13 11 17.5 69.5 Study Questions for Midterm 3 Island Biogeography
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1. What are the defining characteristics of an island? What are the 2 major characteristics of fauna on islands relative to those on the mainland? According to these characteristics, what types of ecological scenarios or settings might be appropriate for use of island biogeographic theory? They generally harbor fewer species, and have different types of communities. Islands represent a series of isolated habitats, varying in the degree of isolation and size. Because they are isolated, they are unlikely to experience intense competition, and studying islands frees ecologists from having to examine all the particulars of species interactions. By studying different islands, researchers can study the effect of factors like size and isolation on the properties of animal assemblages. It can be a pond in the middle of a desert, a patch of coral in the ocean, or a high mountain top.
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