1. My Life’s a Circle

2. Matter Cycles
the movement of INORGANIC materials from the atmosphere or soil into living ORGANISMS and back again.

3. WATER CYCLE
WATER IN
ATMOSPHERE
PRECIPITATION
EVAPORATION
WATER /ICE

4. WATER CYCLE EVAPORATION - liquid to gas PRECIPITATION - gas to liquid
Organisms return water to the atmosphere through TRANSPIRATION, PERSPIRATION, and EXCRETION

5. Carbon/Oxygen Cycle
CARBON DIOXIDE
PHOTOSYNTHESIS
RESPIRATION
OXYGEN

6. Carbon/Oxygen Cycle
Photosynthesis – plants use CARBON DIOXIDE and release OXYGEN
Respiration – plants and animals use OXYGEN and release CARBON DIOXIDE

7. Carbon/Oxygen Cycle
Burning of FOSSIL FUELS increases the amount of CARBON DIOXIDE in the atmosphere.
This may be increasing the temperature.
(GREENHOUSE effect)

8. Nitrogen Cycle NITROGEN GAS NITROGEN FIXATION DENITRIFICATION ANIMALS
PLANTS
NITRATES

9. Nitrogen Cycle Nitrogen is necessary to make AMINO ACIDS
Nitrogen FIXATION is done by plants containing rhizobium bacteria.
DENITRIFICATION is the returning of nitrogen into the atmosphere

10. Biotic Potential
The rate at which a POPULATION will grow if all individuals SURVIVE and REPRODUCE at maximum capacity.

11. Growth Curve Lag Phase – little or no increase in a population
Exponential Phase – population DOUBLES in a specific time interval and keeps DOUBLING in increasingly shorter periods of time.

12. Exponential Phase
Lag Phase
Time

13. Carrying Capacity
The MAXIMUM number of individuals that the ecosystem is capable of SUPPORTING.

14. Carrying Capacity
Exponential Phase
Lag Phase
Time

15. Limits to Growth
Density-dependent factors
Density-independent factors

16. Density-dependent factors
As the DENSITY changes, these factors change
Space
Food
Predators

17. Density-independent factors
Factors that affect population that have nothing to do with DENSITY
Climate changes
Natural disaster

18. Oh Deer!

19. Succession
The gradual, SEQUENTIAL replacement of POPULATIONS in an area

20. Pioneer Species
The first SPECIES to colonize an area

21. Seral Community
Intermediate COMMUNITIES

22. Climax Community
A community that will remain STABLE as long as it is left undisturbed

24. Primary succession
The sequential REPLACEMENT of populations of an area that has not previously supported LIFE
Example: Sand dunes, volcanic rock, glaciers removing soil, pavement

25. Secondary succession
The sequential REPLACEMENT of populations in DISRUPTED habitats that have not been totally stripped of soil and vegetation.
Example: FOREST FIRE, LOGGING, FARMING, MINING
Old field succession – Replacement of populations in abandoned farm fields

26. Succession in lakes
The transformation of CRYSTAL CLEAR BODIES OF WATER to dry LAND

27. Eutrophication
An increase in the amount of NUTRIENTS in an environment

28. Eutrophic
A lake with many NUTRIENTS in it.