Ecosystem approach to management. What is Ecosystem Management? The ecosystem Past Resource Management Approach New ecosystem management approach Examples Using Natural Processes under Ecosystem Management Disturbance Succession Important types of natural disturbance.
Epic of Gilgamesh – ancient Mesopotamia
Social systems developed by the civilization far outstretched the constraints of ecological systems
A. The Ecosystem = All the organisms in a given area interacting with the physical environment so that a flow of energy leads to trophic structure, biotic diversity and material cycles.
“Any land management system that seeks to protect populations of all native species, perpetuates natural disturbance…at the regional scale, adopts a planning time line of centuries, and allows human use at levels that do not result in long-term ecological degradation.”
Each unit is represented by an ecosystem team which has developed its own biologically- based strategy. The Service has identified and defined boundaries for 53 ecosystem units by grouping the USGS defined watersheds -
Primary community: arises in a lifeless area
Secondary community: occurs after disturbance
Mature forest – nearing climax
Prescribed Burns -the controlled application of fire to existing naturally occurring fuels under specified environmental conditions, which allows the fire to be confined to a predetermined area.
In a study comparing an area burned in April after the snows melt to an area unburned for 25 years, there was a three to fourfold increase in forbs (flowers) for 1 to 2 growing seasons.
Effects of Dams on ecosystems
Number of Species