4. Biodiversity
The period since the emergence of
humans an ongoing biodiversity
reduction and an accompanying loss of
genetic diversity. This is due to:
– Hunting species to extinction
– Introducing toxic chemicals into food
webs
– Introducing a foreign species to a new
environment
6. Biodiversity Health
Biodiversity boosts ecosystem productivity
where each species, no matter how small, all
have an important role to play. For example:
– A larger number of plant species means a greater
variety of crops
– Greater species diversity ensures natural
sustainability for all life forms
– Healthy ecosystems can better withstand and
recover from a variety of disasters.
7. Sustainability
Sustainability describes how biological
systems remain diverse, robust and
productive over time, a necessary
precondition for the well-being of
humans and other organisms.
Long-lived and healthy wetlands and
forests are examples of sustainable
biological systems.
19. Density Independent
Human Activities -
damming, cutting
forests, building roads
20. Things to study for the test
Relationships within an Levels of organization
environment - biosphere
– Biotic vs abiotic – Biomes
– symbiosis – Ecosystem
– Preditor-prey – Community
– Mutualism – Population
– Commensalisms – Organism/species
– Niches
– Habitat
– competition
21. Test stuff
Cycles in Nature:
– Atmosphere to soil (N2 - NO3) denitrification,
nitrification
– Carbon Cycle Photosynthesis/ respiration (O2 - CO2)
– H2O Cycle
– Phosphorus Cycle
22. More
Populations graphs Limiting factors on
– Exponential populations
– Logistic – Density dependent
– Predator prey – Density independent
– Extinction – Limiting factors
– 3 different possible
phases on graphs Biodiversity
– Carrying capacity Sustainability
resources
24. Partner Quiz
1. Autotrophs use light energy to power
chemical reactions that convert CO2 and
H2O into ____
– A. water and carbohydrates
– B. oxygen and carbohydrates
– C. energy and proteins
– D. energy and fats
