Midterm2-f99-key - Name KEY Page 1 of 8 Instructions-Write your name on all the pages-Make sure that all 8 pages are attached GENERAL ECOLOGY PCB

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Name: KEY Page 1 of 8 Instructions: --Write your name on all the pages --Make sure that all 8 pages are attached. GENERAL ECOLOGY PCB 4044 FALL 1999 MIDTERM II (Nov. 3, 1999) PAGE POINTS POSSIBLE SCORE 2 14 _____ 3 10 _____ 4 10 _____ 5 15 _____ 6 25 _____ 7 12 _____ 8 14 _____ _____ _________ TOTAL 100 _____ KEY -- sample answers provided; other reasonable (and correct) answers accepted for full or partial credit.
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Name: KEY Page 2 of 8 1. (4 points) a) At what institution did you take the Ecology and Evolution portion of Introductory Biology (at UF, this would correspond to BSC 2011)? Please give the name of the institution (e.g., UF, SFCC, USF, etc.) or indicate AP if you placed out of the Introductory Biology series. Any reasonable answer accepted. b) Who was your instructor(s) for the Ecology portion of Introductory Biology? Any reasonable answer accepted. 2. (10 points) The Janzen-Connell model supports the theory that plants benefit by having frugivores disperse their seeds away from the parent tree. a) Based on the Janzen-Connell model, draw the expected seed shadow and survivorship curves on the axes below (be sure to label the axes). Distance from Parent Density of seeds, or Density of seedlings, or Proportion Surviving Seed shadow Survival Seedlings b) On this same figure, draw the curve describing seedling recruitment. c) Explain the biological mechanisms that give rise to these patterns. The seed shadow is highest near the parent because of limited dispersal and the fact that there is much more total area at greater distances from the parent. The pattern in survivorship results from density dependent mortality, which is high under the parent tree (at low distances) where seed density is high. At greater distances, lower seed density results in greater survivorship. Thus, at intermediate distances, the number of older seedlings ("recruits") is highest because it is the product of the seed shadow and survivorship curves.
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Name: KEY Page 3 of 8 3. (10 points) Two species compete for resources. Their interaction can be described using the Lotka-Volterra Competition Equations. The following data are available: in the absence of Species A, Species B reaches an equilibrium density of 60 / acre. in the absence of Species B, Species A reaches an equilibrium density of 50 / acre.
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This note was uploaded on 06/04/2011 for the course PCB 4043 taught by Professor Osenberg during the Spring '10 term at University of Florida.

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Midterm2-f99-key - Name KEY Page 1 of 8 Instructions-Write your name on all the pages-Make sure that all 8 pages are attached GENERAL ECOLOGY PCB

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