occurs when individuals in a population reproduce at a constant rate causes: ideal conditions with...
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Occurs when individuals in a population reproduce at a constant rate
Causes:• Ideal conditions with unlimited resources
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Populations growth slows or stops following a period of exponential growth
Causes:• Birth rate decrease, Death rate increases• Birth rate and death rate are equal• Rate of immigration decreases• Rate of emigration increases
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Factor that causes population growth to decrease
Competition Predation Parasitism and disease Drought and climate extremes
• Human disturbances
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Density Dependent Factors: Limiting factor that depends on population size
Density Independent Factors: not dependent on population size
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Competition• Overcrowding causes organisms to compete
for food, water, space and sunlight Predation
• Predator-prey relationship Parasitism and Disease
• Parasites take nutrients from host, weakening host, spreading disease or death
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Affects all populations in similar ways, regardless of population size• Unusual weather• Natural disasters• Seasonal cycles• Human activities