302 exam 2

302 exam 2 - NAME: _ LAB INSTRUCTOR:_ ECOL 302 Second...

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NAME: _______________________________________________________ LAB INSTRUCTOR:____________________________________________ 1 Page score_______ ECOL 302 – Second midterm examination – Fall 2006 Put your name at the top of each page NOW. All questions are worth 8 points each. ANSWER IN THE SPACE ALLOTTED OR LESS. Use graphs or equations in your answers wherever you want or need to. Use correct units where applicable. You will need some of the following equations: dN/dt = rN dN/dt = rN[(K - N)/K] dN/dt = rNt[(K - N t- J )/K] N t+1 = λ N t G = Σ l(x)m(x)x / Σ l(x)m(x) N t = N 0 e rt lnN t = lnN 0 + rt r = b – d r = lnR 0 /G N t+1 = Nt(1 + r d (K - N t )/K)) R 0 = Σ l(x)m(x) l(x) = S(x)/S(0) (1) What is the equation that is used to determine how many individuals are added to a population that is exhibiting Malthusian (exponential) growth: dN/dt = rN (N t = N 0 e rt would be used to predict population size at time t) Briefly state one of the assumptions that we make when using the Malthusian growth equation: Closed population; constant environment; all individuals the same; continuous (2) Describe or name the type of population dynamics illustrated in figures A through C (for C, focus on the part of the curve that is in the dashed circle). (A) _ negative exponential growth _________ (B) ___ logistic growth _______________ (C) ____ Allee effect _____________________ (D) On figure B below, label the equilibrium point. Mark and label where the population would be growing at a maximal rate
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NAME: _______________________________________________________ LAB INSTRUCTOR:____________________________________________ 2 Page score_______ N dN dt 0 - + (A) N dN dt 0 - + (B) N dN dt 0 - + (C) (3) You introduce 5 individual fruit flies of the species Ceratitis capitata to an incubator filled with ripe apples to see how fast this species of fruit flies can grow. You provide ample food to the fruit flies,
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302 exam 2 - NAME: _ LAB INSTRUCTOR:_ ECOL 302 Second...

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