Ecology-population dynamics I

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Presentation transcript:

Ecology-population dynamics I Characteristics of population

Population growth - from zero

Given favourable conditions, bacteria double in number every 20-30 minutes.

Huge Reproductive potential of living organisms

Huge reproductive potential

Reproductive potential

Natural pop remains roughly stable over time despite huge reproductive potential

Environmental resistance

Carrying capacity and Environmental resistance

Population equation

J-shaped growth

J-shaped growth

J-shaped growth                                                          

J-shaped – swarm of locust

Survivorship curve e.g. Oyster

Oyster_life cycle

The very haphazard life of planktonic larvae

Oyster_adult stage-well secured

Survivorship curves_different life strategies

Equal chance of death at all ages

Different life strategies

Age structure_Sweden vs Costa

Age structure-India

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