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Ecology-population dynamics I

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Presentation on theme: "Ecology-population dynamics I"— Presentation transcript:

1 Ecology-population dynamics I
Characteristics of population

2 Population growth - from zero

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

4 Huge Reproductive potential of living organisms

5 Huge reproductive potential

6 Reproductive potential

7 Natural pop remains roughly stable over time despite huge reproductive potential

8

9 Environmental resistance

10 Carrying capacity and Environmental resistance

11

12 Population equation

13 J-shaped growth

14 J-shaped growth

15 J-shaped growth                                                          

16 J-shaped – swarm of locust

17 Survivorship curve e.g. Oyster

18 Oyster_life cycle

19 The very haphazard life of
planktonic larvae

20 Oyster_adult stage-well secured

21 Survivorship curves_different life strategies

22 Equal chance of death at all ages

23 Different life strategies

24 Age structure_Sweden vs Costa

25 Age structure-India


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