BIO120H1 Lecture Notes - Lecture 18: Exponential Growth, Net Reproduction Rate, Step Function
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BIO120H1 Full Course Notes
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Lecture 18: population ecology: models without age structure. Defining populations and individuals, with a focus on some unusual cases. Exponential and geometric population growth models without density dependence. Incorporating density dependence; effects of crowding, etc. More complex density dependent: time delays, allee effects. Population: collection of (interbreeding) individuals in a certain area. Pop. size n = number of individuals. Population ecology developed by zoologists (more ambiguity about plant individuals) Aspen: clones: one seed produces many identical, connected stems. Connected underground roots; many physiological individual but one genetic individual. Larkspur: many unique seeds produce many unique plants. Each is called an individual: genetically and physiologically distinct. Dandelion: no sex; many identical seeds produce many identical, unconnected. Relationships among models in bio120: basic models: Density independent (no crowding effect etc. conditions are good) Density dependent (slowed down growth as number gets bigger: extension for greater realism. Predict the trajectory of population growth through time, i. e. , n as a function of t.
