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MSU ISB 202 - Populaition Dynamics Continued

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ISB 202 1nd Edition Lecture 14 Outline of Last Lecture I. Population DynamicsOutline of Current Lecture II. Reproductive StrategiesIII. Dynamics of Population GrowthIV. Logistic Growth CurveV. Factors Affecting PopulationsCurrent LectureReproductive Strategies- r – Selected Species (cockroach)- K – Selected Species (Elephant)- Two Ends of a Spectrum- r vs. K Strategies o Sizeo Number of Offspringo Parental Careo Reproductive Ageo Mortalityo Population Growth Rateo Population size stabilityo Successional Stageo Niche WidthThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Carrying Capacity (K)- The number of individuals of a given species that can be sustained in a given space.Dynamics of Population Growth- Exponential Growth - growth at a constant rate of increase per unit time (geometric) ; has no limit- Exponential Growtho J curve when the equation is graphedo Initial increase is slow, however, numbers increase quickly because a % increase leads to a much larger increase as the population grows.- Growth to a Stable Population- Logistic Growth - growth rates regulated by internal and external factors until coming into equilibrium with environmental resourceso Growth rate slows as population approaches carrying capacity.o S curve when the equation is graphedLogistic Growth Curve (S Curve)- Factors Influencing Population Growtho Births (natality)o Deaths (mortality)o Immigrationo Emigrationo Factors affecting populationo Density independent factors- These are factors that have the same effect on a population regardless of population sizeo Weather or climate, natural catastrophes, human activities, are usually independent of population sizeFactors Affecting Populations- Density dependent factorso Density dependent factors have a varying affect on populations based on population sizeo Disease, predation, competition, food shortages, overcrowding are usually density dependent meaning that the population size helps determine the spread of the


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MSU ISB 202 - Populaition Dynamics Continued

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