1. Ecosystems Part 2
Human populations, relationships in communities, disruptions, biogeology, LA Natural resources

2. Learning objectives
I can construct an argument supported by evidence that changes to physical or biological components of an ecosystem affect populations.
I can create a design project that assists in maintaining diversity and ecosystem services.
I can construct an argument supported by evidence of how increases in human population and consumption of natural resources impact Earth’s systems.

3. World population video
Show National Geographic World Population Video

4. World Population clock

5. How Populations change
This is how we measure populations changes.
If the birthrate is higher than the death rate, the population increases.
If the death rate is higher than the birthrate, the population decreases.
Disease and natural disasters such as floods, fires, or volcanic eruptions can decrease populations.
Predation—the hunting of organisms for food—also reduces population size
A population’s birthrate is the number of offspring produced over a given period of time.
The death rate is the number of individuals that die over the same period of time.

6. How populations change
If populations continue to decrease in numbers, they disappear.
An extinct species is a species that has died out and no individuals are left.
Extinctions can be caused by predation, natural disasters, or damage to the environment.

7. How populations change
An endangered species is a species whose population is at risk of extinction.
A threatened species is a species at risk, but not yet endangered.

8. How populations change
Populations also change when organisms move from place to place.
Migration is the instinctive seasonal movement of a population of organisms from one place to another.
Ducks, geese, and monarch butterflies are examples of organisms that migrate annually.

13. As populations migrated,
we began to interact
with communities
As we migrated, we began to interact with other communities

14. Relationships in communities
A close relationship between two or more organisms of different species that live in direct contact is called symbiosis.

15. Symbiotic relationships
A symbiotic relationship in which both partners benefit is called mutualism.
Both species benefit!

16. 1 benefits – the other is not affected
A symbiotic relationship that benefits one species but does not harm or benefit the other is commensalism.
1 benefits – the other is not affected

17. Parasitism: one organism benefits while the other is harmed.
1 benefit = 1 harmed

18. Symbiotic relationships are another role of biotic factors

19. How life interacts with the planet itself
Biogeology
How life interacts with the planet itself

20. Interactions cause the consumption of natural resources

21. Consumption of natural resources

22. Consumption of natural resources
Overconsumption leads to negative impacts:
Climate change
Deforestation
Land shortage
Burning fossil fuels

23. Alternative uses to energy consumption
Resource management
Alternative uses to energy consumption
Solar power, wind energy, nuclear power
Reduce, Reuse, Recycle
Glass, paper, plastic, metal

24. LA Dept. of Natural Resources
Resource management
LA Dept. of Natural Resources
Develops and enforces policies and regulation relating to the consumption and conservation of natural resources in the state.

25. Resource management Coastal Restoration Program
Protect, develop, restore, and enhance the resources of the states coastal zone.
Coastal & Estuarian Land Conservation Program
Protected land
Coastal Nonpoint Pollution Control Program
Reduce pollutants in coastal waters