Start with a small population (n= 5-50) with the # of populations set to 1. Leave all other variables as the default. Select “Island” migration and add a migration rate of 0.1. Describe what happens at a migration rate of 0.1 (10% of individuals migrate between pops). Now increase the rate of migration to 0.5. What are the effects?
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Population Growth
R and K Selection
R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.
Start with a small population (n= 5-50) with the # of populations set to 1. Leave all other variables as the default. Select “Island” migration and add a migration rate of 0.1. Describe what happens at a migration rate of 0.1 (10% of individuals migrate between pops). Now increase the rate of migration to 0.5. What are the effects?
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- Population growth model Notes Population growth Using discrete time steps, which is easier to describe that continuous change, the model for population growth is this: N₁ Try changing the blue numbers, for "r" (rate) and "N0" (start population), below. r: No: Nort Moose: 1.5 House fly: 80 *** 80 Time step (t) (N) Population at end of time step (N₁) 2 0 1 2 3 4 5 6 7 8 9 10 Wolf: 1.2 Z żż ź żż žžžžž ž Cockroach: 40 2 N₁ 160 No 12800 1024000 81920000 6553600000 5.24288E+11 4.1943E+13 3.35544E+15 2.68435E+17 N10 2.14748E+19 N₂ N3 N4 N5 N6 Try these hypothetical "r" values to begin, then try new numbers of your own: N7 N8 N9 Rabbit: 5 Endangered tiger: 0.8Population growth model Notes Population growth Using discrete time steps, which is easier to describe that continuous change, the model for population growth is this: N₁ Try changing the blue numbers, for "r" (rate) and "N0" (start population), below. 80 Time step (t) (N) Population at end of time step (N₁) 2 0 1 2 3 4 5 6 7 8 9 10 r: No: Nort Moose: 1.5 House fly: 80 *** Wolf: 1.2 Z żż ź ż żž Ž ž ž ź ż Cockroach: 40 2 N₁ 160 No N₂ 12800 1024000 81920000 6553600000 5.24288E+11 4.1943E+13 3.35544E+15 2.68435E+17 N10 2.14748E+19 N3 N4 N5 N6 Try these hypothetical "r" values to begin, then try new numbers of your own: N7 N8 N9 Rabbit: 5 Endangered tiger: 0.8S2) Below are two tables showing the population size and deaths by age for one year in the states of Louisiana (LA) and Florida (FL). Use the data to answer the following questions. You may use the blank cells in the tables for calculations and to show answers Age group 0-15 16-70 71+ Louisiana Deaths 30 215 585 Florida Age group Deaths 0-15 16-70 71+ 25 400 725 Population 165,000 300,000 75,000 Population 90,000 435,000 225,000 a. Calculate the overall crude mortality rates for LA and FL expressed as per 100,000 population. LA: FL: b. Calculate the age-adjusted mortality rates using the combined population as the standard. c. Explain what accounts for this difference in crude rates and adjusted rates between LA and FL.
- Write a generalized model for exponential population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes. Write a formula that extends the preceding model to incorporate carrying capacity, producing sigmoidal population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes.The life table below is for a species of lizard. Use it to answer the questions below. It can be copied and pasted in excel or downloaded here. What is the intrinsic rate of increase of this population? nx bx 678 1 102 31 19 10 4 14 12 12 12 10 14 10 10 8. 11 6. 10 1.32 0.053 1.89 0.51(Number marked × total number recaptured)# recaptured with mark/Number marked × total number recaptured# recaptured with mark The formula above is the equation for estimated population size using the Mark and Recapture method of population estimation. I initially catch and tag 10 rabbits. Later I recapture 50 total rabbits and 10 of those are marked. What is the estimated population size of this rabbit population? Question 22 options: 500 rabbits 20 rabbits 2 rabbits 50 Rabbits
- There are 453 mice in a population. There is no net immigration or emigration. If 47 mice die and 32 mice are born in one month, what is the population size at the end of the month? What is the size of the population at the end of the month?If a population has a constant r = 0.3 Group of answer choices the per capita rate of population increase continues to accelerate as the population grows the time necessary for population size to double gets shorter as time goes by since population size is increasing exponentially the absolute increase (change in population size per unit time) is also constant the time necessary for population size to double is also constantThe discrete logistic function (the one you can solve with your calculator) has a time lag built in = one generation. What would a greater time lag do to the outcome? increase the chances of population exceeding K decrease the chances of population exceeding K slow down population growth by decreasing r increase population growth by increasing r it would have little/no effect under all circumstances
- Wolf biologists started estimating the number of wolves in 2000 at 21 wolves in GTNP population. In 2010 they repeated their population surveys and counted 105 animals. What is the doubling time for this population? The Tripling time? What is the current (2022) estimated population?The curve below shows the growth rate of a population that has a per capita growth rate of 0.4. Which of the following is true about this curve. More than one is possible. exponential growth 2500000 2000000 1500000 1000000 500000 0 5 10 15 20 25 Select one or more: Ua. r becomes greater as the population grows because there are more births per year. b. There are more births per generation as you move right on the graph c. exponential growth is most often observed in stable populations that have resided in an environment for a long time. Od. The slope of the curve changes continuously as you move to the right even though r remains the same.Write a generalized model for exponential population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes.