Logistic Growth and Human Demographics: Population Dynamics and Carrying Capacity, Slides of Ecology and Environment

Download Logistic Growth and Human Demographics: Population Dynamics and Carrying Capacity and more Slides Ecology and Environment in PDF only on Docsity! 1 I. Logistic Growth (Chap. 11, continued) A. Patterns: Sigmoidal curve B. Equation C. What limits population growth? Density dependent factors Density independent factors II. Human demographics A. Distribution B. Growth rates and carrying capacity C. Age Structure Population Ecology 3 Logistic Growth and Human Demographics Bottom line of exponential growth: When there are no limits, populations grow faster, and FASTER and FASTER! What happens if there are limits? (And eventually there ALWAYS are!) LOGISTIC POPULATION GROWTH A. Patterns 11.6 11.9 11.11 2 11.12 The sigmoidal curve defines the shape of logistic growth. Draw it. What are the axes? What is r? Is it constant or changing? Where is r at its maximum? Where is dN/dt at it’s maximum? B. The equation 11.14 Higher N leads to lower realized r Assumptions of logistic 1) Assumes rapid feedback from pop. size to b and d. 2) No minimum size (e.g., difficulty finding mates, social organization, etc.) 3) Constant K C. What limits population growth? 1. Density dependent factors 2. Density independent factors