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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 Justin ray m guce 2008
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
CHARACTERISTICS OF A POPULATION • POPULATION DENSITY • Number of individuals per unit area
CHARACTERISTICS OF A POPULATION • POPULATION DISPERSION • clumped • uniform • random
CHARACTERISTICS OF A POPULATION • GROWTH RATE • Factors affecting population size • # of births • # of deaths • Immigration and emigration
ARMM- 3.86% • Region IV- 3.72 • NCR- 1.06%
CHARACTERISTICS OF A POPULATION • Types of GROWTH • Exponential • Logistic
CHARACTERISTICS OF A POPULATION • Exponential • J-shaped curve • reproduction at constant rate • ideal conditions
CHARACTERISTICS OF A POPULATION • Logistic • S- shaped curve • Growth stops after an exponential growth
CHARACTERISTICS OF A POPULATION • AGE STRUCTURE • growth depend on the age of the population • age structure diagrams
CHARACTERISTICS OF A POPULATION • DEMOGRAPHIC TRANSITION • Dramatic change in birth and death rates • Birth rate falls to meet the death rate
LIMITS TO GROWTH • Limiting factors • Causes population to decline • Insufficient supply of nutrients • 2 types of FACTORS • DENSITY DENPENDENT • DENSITY INDEPENDENT
DENSITY DEPENDENT FACTORS • depends on population size • becomes limiting when… • POPULATION REACHES A CERTAIN LEVEL • large and dense population size
DENSITY DEPENDENT FACTORS • INCLUDES • Competition • Predation • Parasitism • Disease
DENSITY INDEPENDENT FACTORS • affects all population in similar ways • REGARDLESS of its POPULATION SIZE • Characteristic crash in population size
DENSITY INDEPENDENT FACTORS • INCLUDES • UNSUAL WEATHER • SEASONAL CYCLES • NATURAL DISASTERS • HUMAN ACTIVITIES