[23042014] Predator Versus Prey Simulation: Wolves & Rabbits
Posted on Thursday, April 24, 2014 at 11:21 PM


Note: The green cells represent the population in a new generation/ round
Correction: The cell immediately below the seventh generation should have said "4" instead of "3."

Analysis:

For this simulation, we were unable to complete more than 9 generations of observation, meaning that the graph above appear incomplete. However, to compensate for an incomplete graph, I will post a predator-vs-prey simulation graph completed from another source in addition to a general analysis of the graph.

In the line graph above, both the total population of rabbits and the wolves increase. The rabbits' population doubles every generation, whereas the wolf's population can only be doubled for every three rabbits it catches. This is the reason why the wolf has a slower population growth rate in comparison to the rabbits.

When looking at the graph, the number of arctic rabbits (white in colour) surpass that of a rabbit of other colours. This is because we have to take in setting to consideration, which in this case is the arctic, where snow is ubiquitous. With this piece of valuable information, it isn't hard to discern that arctic rabbits have the advantage of camouflage. Other species of rabbits like the "honeydew green" rabbit and the "olive green" rabbit are the first to become extinct because of the stark contrast between their fur and surroundings. The "green" rabbits do end up surviving for the nine generations recorded, but do so in smaller numbers in comparison to the arctic rabbit. 


Above is a general graph that compares the population of prey and predators. Like I mentioned above, I have posted this general graph as to compensate for the lack of data recorded for this simulation due to lack of time. Although this graph is not highly detailed, it does serve the purpose of explaining the relationship between prey and predators. As you can see, the number of prey increases as the number of predators decrease, and the number of prey decrease when the number of predators increase. 

When the number of predators increase, it will need prey to sustain the population. Consequently, the need for more food resources end up depleting the prey population because the prey population is the food resource for the predators. As a result of having the prey population decrease faster than the rate of prey reproduction, the population of prey will naturally decrease.

As the prey population decreases, the predators source of food also decreases, meaning that its population will need to compete for nutritional resources. As a result, only a fraction of the population deemed "fit" will be able to retrieve this source of food and survive, while the rest of the population steadily depletes. However, when the graph breaks even after the predator population decreases, the cycle begins again with a larger population of preys than predators. This is because there are less predators to hunt for prey, meaning that prey can finally reproduce and repopulate their species. The cycle then repeats again.

Predators and prey co-evolve together. This co-evolution can be accredited to the fact that mutations may form traits favourable for some organisms in the survival-of-the-fittest competition. For example, mutations may make the arctic rabbit run faster, increasing their probability of escape from the wolf. Other arctic rabbits without this mutation will inevitably be consumed by the wolf, and the ones with the mutation are left to breed, creating a new generation of faster arctic rabbits. Similarly, the wolves that are unable to successfully capture any food will eventually die, leaving the wolves, who are faster, more discreet , and able to catch and consume these quicker rabbits, to breed. As a result, the genetic mutation that makes these wolves faster are passed on, and the difference in speed between the rabbit and the wolf will return to more or less the same as it was previously. Theoretically, this means that wolves and rabbits can only get faster after every generation.

Also, this is all I could think about every time I wrote "wolf." Sorry. 엑소 진짜 대박.


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