APES Unit 5: Resource Management and Forestry

Tragedy of the Commons

An environmental concept introduced by Garrett Hardin that describes how individuals acting independently according to their self-interest can deplete a shared resource.

Commons

A shared, limited resource that is not owned by any specific individual but is available to all.

Common-pool resource

A type of resource that is shared by many users, leading to potential over-exploitation.

Open-access resource

A resource that is freely available to all individuals without restrictions.

Incentive

A benefit gained from exploiting a resource, which leads individuals to overuse that resource.

Overgrazing

The depletion of grasslands due to excessive grazing by livestock.

Overfishing

The practice of depleting fish populations faster than they can reproduce, resulting in fishery collapse.

Groundwater depletion

The reduction of groundwater levels due to excessive pumping from aquifers.

Private Ownership

A method of resource regulation where commons are converted into private property, incentivizing owners to protect them.

Government Regulation

The enactment of laws or policies that limit the use of common resources to prevent over-exploitation.

Maximum Sustainable Yield (MSY)

The maximum amount of a renewable resource that can be harvested without compromising future availability.

Carrying Capacity (K)

The maximum population size that an environment can sustain.

Logistic Growth

Population growth that is rapid at first and slows as it approaches carrying capacity.

Clearcutting

A timber harvesting method where all trees in a specific area are removed at once.

Soil Erosion

The removal of topsoil due to lack of plant roots holding the soil in place, often exacerbated by clearcutting.

Increased Turbidity

Cloudiness in water caused by eroded soil, which harms aquatic life by blocking sunlight and clogging fish gills.

Water Temperature Rise

The increase in temperature of water bodies due to loss of shade from surrounding vegetation.

Flooding and Runoff

The rapid movement of water over the surface when forests are removed, leading to increased flooding.

Habitat Fragmentation

The process of breaking up larger habitats into smaller, isolated sections, often due to human activities like clearcutting.

Loss of Biodiversity

The decline of the variety and variability of life forms due to practices like clearcutting.

Selective Cutting

A timber harvesting practice that involves removing specific trees while leaving others standing.

Shelterwood Cutting

A timber harvesting method that removes trees in stages, allowing younger trees to grow under the shade of mature trees.

Edge Effects

Changes in population or community structures that occur at the boundary of two habitats, often harmful in fragmented ecosystems.

Albedo Effect

The impact of surface reflectivity on local temperatures, affected by deforestation.

Erosion vs Weathering

Erosion refers to the movement of soil and rock, while weathering refers to the breakdown of rocks.

Henry Hardin

The ecologist who introduced the concept of the Tragedy of the Commons in 1968.

Environmental regulation

Laws or policies intended to protect the environment by regulating the use of common-pool resources.

Quota System

A regulatory approach that limits the amount of resources that can be harvested or used.