1. SNC1D
Biodiversity

2. Equilibrium
The state of an ecosystem with relatively constant conditions
Abiotic (non-living) conditions are stable
Energy flow through the system (food chains)
Nutrients are cycled
Photosynthesis in balance with cellular respiration

3. Biodiversity: the variety of life in a particular ecosystem

4. Monoculture: an environment with very low biodiversity
Monocultures are very vulnerable to ecological collapse: when all living things in an ecosystem die.

5. High biodiversity leads to sustainable ecosystems.
In part, due to redundancy in the food web.
If the number of rabbits decreases, the foxes can still eat squirrels.

6. Biodiversity Under Attack
Humans are rapidly destroying Earth's ecosystems and along with them, many species, some we don't even yet know exist.

7. Species at Risk
Extinct: a species that has died out and no longer exists anywhere on Earth
Example:
Passenger pigeon

8. Species at Risk
Extirpated: a species that no longer exists in a specific area in the wild but still lives elsewhere
Example:
Atlantic walrus in
Northwest Atlantic

9. Endangered: a species facing imminent extirpation or extinction
Species at Risk
Endangered: a species facing imminent extirpation or extinction
Example:
Swift fox

10. Species at Risk
Threatened: a species that is likely to become endangered if factors reducing its survival are not changed
Example:
Humpback whale

11. Species at Risk
Special Concern: a species that may become threatened or endangered because of a combination of factors
Example:
Polar bear

12. Habitat: the natural environment in which an organism lives, included food and shelter Habitat fragmentation: remaining wild areas are divided into smaller parts
Many organisms lose their habitat to human development (cities, farms, etc.).

13. Factors Affecting the Sustainability of Habitats
Size: large blocks support larger and therefore more stable populations and communities
One large block is better than an equal area of smaller blocks.

14. Factors Affecting the Sustainability of Habitats
Proximity: the closer areas are to each other, the greater the chance populations will be able to interact
Wildlife corridors connect areas and further increase the chance of interaction.

15. Factors Affecting the Sustainability of Habitats
Integrity: access by roads and trails can increase pollution, hunting, and fishing

16. Factors Affecting the Sustainability of Habitats

17. HOMEWORK Read page 80 (stop at Ecological Succession)
Answer pg 82 # 1 & 9
Read pages 83-90
Answer pg 86 #1-7
Answer pg 90 #1-6