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POPULATION ECOLOGY

POPULATION ECOLOGY. Justin ray m guce 2008. HOW DO WE DEFINE POPULATION???. TERMS TO REMEBER. Population group of organisms that belong to the same species and live in a given area. CHARACTERISTICS OF A POPULATION. GEOGRAPHIC DISTRIBUTION Describes the area inhabited by a population.

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POPULATION ECOLOGY

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  1. POPULATION ECOLOGY Justin ray m guce 2008

  2. HOW DO WE DEFINE POPULATION???

  3. TERMS TO REMEBER • Population • group of organisms that belong to the same species and live in a given area

  4. CHARACTERISTICS OF A POPULATION • GEOGRAPHIC DISTRIBUTION • Describes the area inhabited by a population

  5. CHARACTERISTICS OF A POPULATION • POPULATION DENSITY • Number of individuals per unit area

  6. CHARACTERISTICS OF A POPULATION • POPULATION DISPERSION • clumped • uniform • random

  7. CHARACTERISTICS OF A POPULATION • GROWTH RATE • Factors affecting population size • # of births • # of deaths • Immigration and emigration

  8. ARMM- 3.86% • Region IV- 3.72 • NCR- 1.06%

  9. WHAT DOES this picture SHOW US???

  10. CHARACTERISTICS OF A POPULATION • Types of GROWTH • Exponential • Logistic

  11. CHARACTERISTICS OF A POPULATION • Exponential • J-shaped curve • reproduction at constant rate • ideal conditions

  12. CHARACTERISTICS OF A POPULATION • Logistic • S- shaped curve • Growth stops after an exponential growth

  13. CHARACTERISTICS OF A POPULATION • AGE STRUCTURE • growth depend on the age of the population • age structure diagrams

  14. CHARACTERISTICS OF A POPULATION • DEMOGRAPHIC TRANSITION • Dramatic change in birth and death rates • Birth rate falls to meet the death rate

  15. LIMITS TO GROWTH • Limiting factors • Causes population to decline • Insufficient supply of nutrients • 2 types of FACTORS • DENSITY DENPENDENT • DENSITY INDEPENDENT

  16. DENSITY DEPENDENT FACTORS • depends on population size • becomes limiting when… • POPULATION REACHES A CERTAIN LEVEL • large and dense population size

  17. DENSITY DEPENDENT FACTORS • INCLUDES • Competition • Predation • Parasitism • Disease

  18. Competition

  19. Competition: overcrowding

  20. Predation

  21. Parasitism

  22. Disease

  23. DENSITY INDEPENDENT FACTORS • affects all population in similar ways • REGARDLESS of its POPULATION SIZE • Characteristic crash in population size

  24. DENSITY INDEPENDENT FACTORS • INCLUDES • UNSUAL WEATHER • SEASONAL CYCLES • NATURAL DISASTERS • HUMAN ACTIVITIES

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