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Understanding Population Ecology: Key Concepts in Population Density, Dispersion, and Growth

This lesson on population ecology explores essential vocabulary and concepts including population definition, density, and demographics. We’ll discuss the methods for studying populations, including clumped, uniform, and random dispersion patterns. The limitations of population sizes are defined through the concept of carrying capacity, and the differences between exponential and S-curve growth patterns are analyzed. Key factors that affect population dynamics will also be examined, including resources such as food, water, and space, crucial for understanding ecological relationships.

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Understanding Population Ecology: Key Concepts in Population Density, Dispersion, and Growth

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  1. Population Ecology ORTIS Project Lesson 10

  2. Major Vocab Word Population: a group of individuals of a single species living in the same place at the same time. Difficulty in studying populations: Where are the barriers/boundaries that define a given population?

  3. The interests of the population ecologist lie within 3 areas. • Density of the population • Dispersion of the population • Demographics of the population

  4. Population Density • The number of individuals per unit area.

  5. Dispersion of the population • Clumped – organisms living in clusters • Uniform – organisms are evenly dispersed • Random – there is no pattern to the dispersion

  6. Demographics • Density and Dispersal cover the results of: • Ecological needs of the species • Structure of the environment • Inter-population relations • Demographics: • Studying birth rates and death rates over time • How these rates vary among individuals and between males and females

  7. Population size is limited • Carrying Capacity: • Carrying capacity is the number of individuals in a population that an ecosystem can support over a relatively long period of time. carrying capacity for the organism # of organisms time

  8. Types of population growth • Exponential growth – “J - curve” carrying capacity # of organisms time

  9. Types of population growth • S – curve population growth carrying capacity # of organisms time

  10. Population growth: explanations • Most populations have limited resources – these become limiting factors to population growth. • Food • Space • Water • When limiting factors exist, S – curve population growth occurs. • When does J – curve population growth occur?

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