Thought Set 2

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University of Michigan, Flint *

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BIO-327

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Biology

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Dec 6, 2023

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docx

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Thought set 2 Name_______________________________ BIO 327 Note: Responses may be handwritten or typed. You are encouraged to discuss Thought Sets with classmates, but you must turn in your own work in your own words. Submit this assignment by the due date on Canvas. 1) You are studying a population of mosquito ( Culex perturbans ) that is growing exponentially. Initially, the population size was 1000. After one month of observations, you record 200 births and 150 deaths. A) Define and calculate b, d and r for this population. (show your work, 3 points) 200/1000=0.2 b and b = birth rate 150/1000= 0.15 d and d = death rate (200-150)/1000= 0.05 r and r = number growth of individuals per individual B) Based on your calculations above, but without doing further math, describe if the population growing or shrinking and how you know. (1 points) Growing due to the birth rate being larger than the death rate 2) In a study of a population of the endangered Rusty Patched Bumblebee ( Bombus affinis ), you capture and mark 178 individual bees during an 8-hour period. One week later, using the same protocol, you capture 95 bees (54 of which are marked) during an 8-hour period. Estimate the size of the Rusty-Patched Bumblebee population. (show your work, 4 pts) (178*95)/54=313 Rusty-Patched Bumblebee’s

3) In Grinnell’s 1917 paper, he first defines an ecological niche of the California Thrasher. Find Grinnell’s paper using the UM-Flint library electronic resources. Name and describe two factors Grinnell used to define this first concept of a “niche”. (3 points) 1. Floral factors where the thrashers will not enter zones containing transition plants opting to stick to an area containing lower zone plants 2. Faunal factors they were dependent on atmospheric humidity opting to avoid arid areas 4) Describe the competitive exclusion principle to a friend who is not a biology major – no science jargon allowed and creativity is encouraged! (2 points) If you want to have a dog and a cat but only have one food bowl water bowl and you are unable to purchase more either the dog or the cat will take ownership of the food and water bowl and the other would have to leave to find food and water somewhere else or one would starve or dehydrate 5) What is the purpose of the competition coefficients alpha and beta in the Lotka-Volterra equations? For full credit write the equations properly placing alpha and beta, and describe to me what alpha and beta do in a few sentences. (4 points) r1N1((K1-N1-alphaN2)/K1) for species 1 r2N2((K2-N2-betaN1)/K2) for species 2

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