Biology Meets Math. Predator-Prey Relationships in Belowground Ecosystems. US Department of Homeland Security
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1 Biology Meets Math Predator-Prey Relationships in Belowground Ecosystems US Department of Homeland Security
2 Goals: Define Predator and Prey in relation to soil ecology Define a mathematical model and identify some examples when one is useful Create a hypothesis Explain the basics behind the given simple Predator- Prey Relationship Model Graph the results of the given model Use your results to support or refute your hypothesis
3 Predators & Prey Predator: an organism that hunts, kills and eats other organisms (prey) to survive Prey: an organism hunted and taken as food
4 In the Soil. Predation happens on a variety of scales Source: TIEE (ESA) Where the telescope ends, the microscope begins. Which of the two has the grander view? -- Victor Hugo
5 Classic Predator-Prey Canadian lynxes and hares Fur trapping data Controversial! Theoretically you d expect prey to peak before predators every time Let s get help from a model!
6 Do these models look helpful?
7 So what do we mean by a Model?
8 You re a Modeler! Have you ever calculated how much gas it s going to take you to get somewhere? Have you ever estimated how long it ll take you to save up for something? Picked the best line at the grocery store? Others?
9 Brace Yourself for Math! (Trust Me, You Can Do It!) Math Anxiety
10 What do we mean by a Mathematical Model? Occam s Razor Real World Interpret and Test Model World Model Results Your Big Question A Purposeful Representation of Reality Figure from A Course in Mathematical Modeling by Mooney & Swift Model Math
11 Soil Biologists Use Models Nutrient cycling Decomposition Carbon sequestration Predator-Prey Host-parasite Soil formation/erosion
12 Some Kinds of Models Stochastic Model: Has randomness! Discrete Model: No randomness Theoretical Model: for explaining observed phenomena Deterministic Model: for predicting events in time
13 Theoretical Predator-Prey How did they do it?
14 Terms: The Mathematical Model N n Your prey population at the moment (time step n)
15 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 Your prey population at the next time step
16 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 R Your prey population at the next time step The prey population s growth rate
17 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 R K Your prey population at the next time step The prey population s growth rate The prey s carrying capacity
18 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 R K C Your prey population at the next time step The prey population s growth rate The prey s carrying capacity The predator s efficiency in nabbing prey
19 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 R K C P n Your prey population at the next time step The prey population s growth rate The prey s carrying capacity The predator s efficiency in nabbing prey Your predator population
20 Terms: The Mathematical Model N n Your prey population at the moment (time step n) N n+1 R K C P n Q Your prey population at the next time step The prey population s growth rate The prey s carrying capacity The predator s efficiency in nabbing prey Your predator population The predator s efficiency in using prey to reproduce
21 How Do You Expect These to Relate? If the prey population growth rate is positive, what do you expect will happen to the population of prey over time? As the prey population reaches its carrying capacity, what do you expect will happen to the prey population? As the predator s efficiency in getting prey goes up, what do you expect will happen to the prey population? As the predator s population goes up, what do you expect will happen to the prey population? As the prey population goes up, what do you expect will happen to the predator population? As the predator s efficiency in using energy it gets from prey to reproduce goes up, what would happen to the prey population?
22 How Do You Expect These to Relate? If the prey population growth rate is positive, what do you expect will happen to the population of prey over time? Prey population goes up. As the prey population reaches its carrying capacity, what do you expect will happen to the prey population? Prey growth slows down. As the predator s efficiency in getting prey goes up, what do you expect will happen to the prey population? Prey population goes down. As the predator s population goes up, what do you expect will happen to the prey population? Prey population slows down or goes down. As the prey population goes up, what do you expect will happen to the predator population? Predator population goes up. As the predator s efficiency in using energy it gets from prey to reproduce goes up, what would happen to the predator population? Predator population goes up.
23 Introducing what you just said Growth of Prey Population Existing Prey Population Prey Population Gets Pulled Down by Predators What about the predator population?
24 Hello Predators! Growth of Predator Population
25 Does this actually work? Let s plug some stuff in! Assumptions: K =100 R = 1.5 Q = 0.02 N 0 = 50 P = 0.2 C = 3
26 Answer Key Time Step (n) N (Prey Population) P (Predator Density)
27 Goals: Play with a Predator-Prey Model using Netlogo (free online software!) Have some free-wheeling inquiry-based fun
28 Computers: An Easier Way to Model Go to website: ccl.northwestern.edu/netlogo/ Download the program Pay attention to what folder the program downloads into. Then put the file Bacteria Protozoa Predation.nlogo in the same folder
29 Open the Model Run Netlogo Go to File Open Find the Bacteria Protozoa file Select Open
30 Netlogo Interface Check it out! To run Press the Setup button
31 Netlogo Interface Check it out! To run Press the Setup button Press the Go button
32 Netlogo Interface Check it out! To run Press the Setup button Press the Go button And watch what happens!
33 Netlogo Interface Check it out! To run Press the Setup button Press the Go button And watch what happens! Oh my.
34 Background on the Model Select the Information tab, and read about this model Then work through the worksheet
35 Need More Challenge? Click on the Procedures tab See the computer codes that make the model work Tutorial available on the Netlogo website
36 Looking for More? Check out our modules on quantifying biodiversity and measuring a forest!
37 Sources Charles J. Krebs. Ecology: The Experimental Analysis of Distribution and Abundance. Harper and Row Publishers, New York, second edition, Douglas Mooney & Randall Swift. A Course in Mathematical Modeling. The Mathematical Association of America, Netlogo copyright 1997 Uri Wilensky. See for terms of use.
38 For this Module & More: Website: See what we re all about Sign up for our bimonthly newsletter Check our blog
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Another lab report sample: This is Natasha and Stephanie s first attempt at a lab report so bear that in mind as you read this sample report. Natasha Duell Stephanie Moeller AP Bio/Sastry 10 September