31apopul2 - Differentiate the concepts of density dependent...

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1 Differentiate the concepts of density dependent and density independent  influences on population growth. Be able to explain the shape of the logistic population curve in terms of  density dependent selection pressures. Discuss the related ideas of logistic growth curve, density dependent influences and the strength of natural selection pressures. Understand that only experiment can determine the influences that affect population growth.
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2 Where we are going I. Models of Population Growth A. Modeling r = rate of growth B. Exponential growth model C. Logistical growth model II. Approaching K (carrying capacity): A. Density dependent factors B. Density independent factors III. Survivorship curves
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3 Approaching K: Do populations conform to  the logistic model of population growth? A. Density - Dependent Factors 1. Theory a. r is decreased by  environmentally induced  increased mortality or decreased reproduction b. Effect of environmental factor intensifies  as  population density increases
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4 Decreased reproduction: plants Plantain Control density in planting beds. Competition for resources Soil Nitrogen : an environmental  factor affecting plant  growth / reproduction. Availability of nitrogen to a single plant is dependent on the presence or absence of other plants.
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5 Decreased reproduction: plants Plantain Note: a decrease in  reproduction as the population approaches K
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Observation of clutch size year by year on an island. Clutch size decreases with intraspecific competition over 
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31apopul2 - Differentiate the concepts of density dependent...

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