1. Warm-Up (2/26)
On the piece of white paper from the back, answer the following question.
Name
Date
Period
Predict the effects of deforestation on ocean acidification.

2. 4A.6b: Changes in regional and global climates and in atmospheric composition influence patterns of primary productivity.
4A.6e: Models allow the prediction of the impact of climate change in biotic and abiotic factors.
4A.6e.1: Competition for resources and other factors limits growth and can be described by the logistic model.
4A.6e.2: Competition for resources, territoriality, health, predation, accumulation of wastes and other factors contribute to density-dependent population regulation.
4A.6f: Human activities impact ecosystems on local, regional and global scales.
4A.6f.1: As human populations increase in numbers, their impact on habitats for other species have been magnified.
4A.6f.2: In turn, this has often reduced the population size of the affected species and resulted in habitat destruction and, in some cases, the extinction of species.
4B.4a: Human impact accelerates change at local and global levels.
Illustrative example: human activities threaten ecosystems on Earth
4C.2b: An organism’s adaptation to the local environment reflects a flexible response of its genome.
Illustrative example: alterations in timing of flowering due to climate changes

3. Population Dynamics, Part II
Regulation of population sizes is density-dependent.
Populations of species compete for:
resources

4. Population Dynamics, Part II
Regulation of population sizes is density-dependent.
Populations of species compete for:
resources
territory

5. Population Dynamics, Part II
Regulation of population sizes is density-dependent.
Populations of species compete for:
resources
territory
prey

6. Population Dynamics, Part II
Regulation of population sizes is density-dependent.
In short, limited food and accumulated waste restrict growth.
after
before

7. And thus population size grows with a logistic curve.
Population Dynamics, Part II
And thus population size grows with a logistic curve.

8. If food is not renewable, the population dies.
Population Dynamics, Part II
If food is not renewable, the population dies.

9. Population Dynamics, Part II
after
before

10. Population Dynamics, Part II
Habitat destruction due to human expansion causes reduced population sizes.

11. Critical Thinking Question #1
Describe a logistic growth curve and explain why a population size would be plotted over time using a logistic growth curve.

12. 4A.6b: Changes in regional and global climates and in atmospheric composition influence patterns of primary productivity.
4A.6e: Models allow the prediction of the impact of climate change in biotic and abiotic factors.
4A.6e.1: Competition for resources and other factors limits growth and can be described by the logistic model.
4A.6e.2: Competition for resources, territoriality, health, predation, accumulation of wastes and other factors contribute to density-dependent population regulation.
4A.6f: Human activities impact ecosystems on local, regional and global scales.
4A.6f.1: As human populations increase in numbers, their impact on habitats for other species have been magnified.
4A.6f.2: In turn, this has often reduced the population size of the affected species and resulted in habitat destruction and, in some cases, the extinction of species.
4B.4a: Human impact accelerates change at local and global levels.
Illustrative example: human activities threaten ecosystems on Earth
4C.2b: An organism’s adaptation to the local environment reflects a flexible response of its genome.
Illustrative example: alterations in timing of flowering due to climate changes

13. Population Dynamics, Part II
But some species can adapt.
Plants, for example, flower earlier in the year due to global warming.

14. Critical Thinking Question #2
Explain how warmer, shorter winters would affect levels of signal transduction proteins and transcription factors in a flowering plant, and describe how this would lead to earlier flower buds. (LO 4.24)

15. Closure
On the piece of white paper from the back, answer the following question:
Name
Date
Period
Predict how expansion of human populations into new areas might result in greater regulation of population sizes of native species.
Scale 1 – 10