carrying capacity
DESCRIPTION
Carrying capacity. Carrying capacity refers to the number of individuals who can be supported in a given area within natural resource limits, and without degrading the environment for present and future generations. Carrying capacity may include. Carrying Capacity may be. Physical capacity - PowerPoint PPT PresentationTRANSCRIPT
Carrying capacity
• Carrying capacity refers to the number of individuals who can be supported in a given area within natural resource limits, and without degrading the environment for present and future generations.
Carrying capacity may include ..• Food• Water• Building materials• Waste processing• Leisure Space
Carrying Capacity may be• Physical capacity • Ecological capacity• Emotional or psychological
capacity
See diagram of graph….
WHAT IS A SUSTAINABLE YIELD?
• It means that there is balance between what we take from the environment and what it can naturally replenish.
• The yield could refer to plants, trees, animals, fish.
• Maximum sustainable yield (MSY) means the amount that can be taken without affecting natural replacement.
MAXIMUM SUSTAINABLE YIELD
Pop at year end must = or exceed the Pop at start
Final pop = Start pop + Growth – mortality & take
If the result is positive then the MSY has not been exceeded. If it is negative the MSY has been exceeded.
• See Fig 9.1 on page 71
Ecological Footprint
• The demands that one individual makes on the environment.
• Demands include:WaterFoodEnergySpace Waste disposal
The Ecological Deficit
• is the level of resource consumption and waste discharge by a population in excess of local carrying capacity
• Questions:• Have we reached a global ecological deficit?• If not, Can you identify any areas that are in
deficit
The trend
• Over centuries humans have taken more and more from the planet
• Because there are more humans
• And we each have more impact or footprint
• We have been borrowing sun energy from the past – fossil fuels
GLOBAL ORCHESTRATION