Factors that regulate population ppt presentation
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Factors that regulate population ppt presentation Presentation Transcript

  • 1. Ecology of Individuals and Populations Factors that Regulate Populations Basilan, Glecy B. Orenday, Johnrey V. Ugtuhan, Carren P. BS Biology III Basilan | Orenday | Ugtuhan | (c) 2014 1
  • 2. IMPORTANT TERMINOLOGIES  Population  Community  Density  Natality  Mortality  Biotic factors  Carrying capacity Basilan | Orenday | Ugtuhan | (c) 2014 2
  • 3. Factors Regulating Population Size  Density-dependent factors - act on a population such that the proportion eliminated depends on the population density. Basilan | Orenday | Ugtuhan | (c) 2014 3
  • 4. Fig. 1 showing the examples of density-dependent effects Basilan | Orenday | Ugtuhan | (c) 2014 4
  • 5. Factors Regulating Population Size  Density-independent - factors that eliminate a proportion of a population regardless of population density. Basilan | Orenday | Ugtuhan | (c) 2014 5
  • 6. Density-independent factors • Forest fire • Modification of weather conditions • Severe storm and flooding • Earthquakes and volcanic eruptions Basilan | Orenday | Ugtuhan | (c) 2014 6
  • 7. Fig. 2 showing the examples of density-independent effect – Forest fire Basilan | Orenday | Ugtuhan | (c) 2014 7
  • 8. “Resource availability affects life history adaptations.” Basilan | Orenday | Ugtuhan | (c) 2014 8
  • 9. TWO TYPES OF LIFE STRATEGIES • K-selected species (Equilibrium) • Characteristics of r-selected species (Opportunist) Basilan | Orenday | Ugtuhan | (c) 2014 9
  • 10. Characteristics of K-selected species (Equilibrium)  late maturation  longer life spans  more parental care  intense competition for resources Basilan | Orenday | Ugtuhan | (c) 2014 10
  • 11. Characteristics of r-selected species (Opportunist)  early maturation  shorter life spans  less parental care  little competition for resources Basilan | Orenday | Ugtuhan | (c) 2014 11