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New Mexico Computer Science For All Population Dynamics: Birth and Death Maureen Psaila-Dombrowski
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Population Dynamics What is a Population? A group living things: Ants, bees, turtles, people… Agent Based Modeling: Agents ( Ants, Bees,… but also molecules, cars, …) Population Dynamics - Life Science Characterizes a population Size, age, type, reproduction, death Changes in Population Population Dynamics
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Population Dynamics Birth Immigration Death Emigration Population Change
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Positive Feedback – Simple Birth RabbitsBunnies More Rabbits Even MORE Bunnies
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Negative Feedback RabbitsBunnies More Rabbits Even MORE Bunnies Food (Not Enough) Population (Too Many or Too Few) Health (Disease) Predators
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Effect of Negative Feedback Limits the population CyclicalLogistic
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Modeling Population Dynamics Birth Rate Factors - Health - Food - Population BIRTH RATE Death Rate Factors - Health - Food - Population - Predators DEATH RATE DETAILED MODEL Birth Rate Factors - Health - Food - Population BIRTH RATE SIMPLE MODEL
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Modeling Birth Many ways to model Birth Agent interactions (same breeds) Agent/Environment interactions (location, food,…) Changes in the agent (correct age, energy,...) Energy > Birth Threshold Need a certain energy to have birth – threshold Energy is lost by birth ask turtles […. If (energy > BirthThreshold) [ set energy (energy – amount lost) hatch #babies [forward 1] ]
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Modeling Death Many ways to model Death Agent interactions (predator/prey, infected agent…) Agent/Environment interactions (toxins, locations…) Changes in the agent (disease, age, energy...) Energy < Death Threshold When energy is less than a threshold - die ask turtles […. If (energy < DeathThreshold) [ die ]
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LOOK AT models ▫Simple epidemiology ▫Rabbits and grass ▫Wolves and sheep
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Summary Population: a group of living things Population Dynamics: study of the characteristics and changes in a population Positive Feedback: results in an increase Negative Feedback: results in a decrease Some Types of Population Growth Exponential Logistic Cyclical Modeling birth and death Agent/Agent interactions Agent/Environment interactions Changes in the agent
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