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# R and k strategies

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• ### R and k strategies

1. 1. Topic 2: Ecosystems 2.6 Changes 2.6.3 - 2.63: r and K strategiesTwo general types of life strategies can be identiﬁed for most organisms • r = growth rateEquilibrium or K strategy species (a species -not the individual - is at carrying capacity K)Opportunist or r strategy species (a species exists in the exponential phase of ofpopulation growth r)
2. 2. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesWhat are K and r• The two variables that deﬁne a population curve• r = growth rate• K = carrying capacity
3. 3. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategies PopulationWhat are K and r 120• The two variables that 100 deﬁne a population curve 80• r = growth rate 60• K = carrying capacity Growth 40 20 Intrinsic rate of growth r 0 0 50 100 150 200 250 300 Time
4. 4. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategies K PopulationWhat are K and r 120• The two variables that 100 deﬁne a population curve 80• r = growth rate 60• K = carrying capacity Growth 40 20 0 0 100 200 300 400 500 600 Time
5. 5. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategies
6. 6. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists
7. 7. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate
8. 8. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate• Large investment in parental care
9. 9. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate• Large investment in parental care• Late maturity
10. 10. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate• Large investment in parental care• Late maturity• Slow growth
11. 11. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate• Large investment in parental care• Late maturity• Slow growth• Large organisms
12. 12. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists• Low reproductive rate• Large investment in parental care• Late maturity• Slow growth• Large organisms• Late successional species
13. 13. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists • Niche specialist• Low reproductive rate• Large investment in parental care• Late maturity• Slow growth• Large organisms• Late successional species
14. 14. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesK strategists • Niche specialist• Low reproductive rate • Require stable environment• Large investment in parental care• Late maturity• Slow growth• Large organisms• Late successional species
15. 15. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategies
16. 16. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists
17. 17. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate
18. 18. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate• Low investment in parental care
19. 19. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate• Low investment in parental care• Early maturity
20. 20. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate• Low investment in parental care• Early maturity• Rapid growth
21. 21. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate• Low investment in parental care• Early maturity• Rapid growth• Small organisms
22. 22. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists• High reproductive rate• Low investment in parental care• Early maturity• Rapid growth• Small organisms• Pioneer species species
23. 23. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists • Generalists• High reproductive rate• Low investment in parental care• Early maturity• Rapid growth• Small organisms• Pioneer species species
24. 24. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesr strategists • Generalists• High reproductive rate • Rapidly adapt to environmental variation• Low investment in parental care• Early maturity• Rapid growth• Small organisms• Pioneer species species
25. 25. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesThe reality is more of a continuum
26. 26. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesThe reality is more of a continuum Zebra Rabbit Bacteria r K
27. 27. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesIf life Tables (Survivorship) is plotted fordifferent species three generalised types of lifecurve formType 1 - Survivorship is high, most mortalitylater in life span (K strategy)Type II - Constant mortality throughout lifespan (in between)Type III - High mortality early in life, lowsurvivorship into late life span (r Strategy)
28. 28. Topic 2: Ecosystems2.6 Changes2.6.3 - 2.63: r and K strategiesIf life Tables (Survivorship) is plotted fordifferent species three generalised types of lifecurve formType 1 - Survivorship is high, most mortalitylater in life span (K strategy)Type II - Constant mortality throughout lifespan (in between)Type III - High mortality early in life, lowsurvivorship into late life span (r Strategy)