Population Curves and Diversity. 3 Phases of Population ► Growth ► Stability ► Decline.

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Presentation transcript:

Population Curves and Diversity

3 Phases of Population ► Growth ► Stability ► Decline

Growth of Population ► Population growth occurs when available resources exceed the number of individuals able to exploit them  As a result, reproduction is rapid and death rates are low causing a net increase in the population size

Population Stability ► Population stability is often preceded by a crash  Caused by the growing populations to outstrip its available resources  Stability is usually the longest phase of a population’s life cycle

Population Decline ► Caused by a decrease number of individuals in a population ► May eventually lead to population extinction

Exponential Growth ► Nearly all populations will tend to grow exponentially as long as resources are avaiable ► Exponential rate happens due to reproduction being a multiplicative process

2 Factors Affecting Population Growth ► Natality: birth rate ► Mortality: death rate ► Population growth rate can be determined by subtracting death rate from birth rate

2 Modes of Population Growth ► Exponential mode: J curve, happens when there is no limit to population size ► Logistic mode: “S” curve, depicts the effect of a limiting factor Reference: