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Ecological efficiency is a combination of several related efficiencies that describe resource utilization and the extent to which resources are converted into biomass. [ 1 ] Exploitation efficiency is the amount of food ingested divided by the amount of prey production ( I n / P n − 1 {\displaystyle I_{n}/P_{n-1}} )
Thus, some consider harvesting at MSY to be unsafe on ecological and economic grounds. [ 14 ] [ 15 ] The MSY model itself can be modified to harvest a certain percentage of the population or with constant effort constraints rather than an actual number, thereby avoiding some of its instabilities.
EwE has three main components: Ecopath – a static, mass-balanced snapshot of the system [2]; Ecosim – a time dynamic simulation module for policy exploration [3]; Ecospace – a spatial and temporal dynamic module designed for exploring the combined impacts of fishing, the placement of protected areas, [4] and changing environmental conditions.
Typical units are grams per square meter per year or calories per square meter per year. As with the others, this graph shows producers at the bottom and higher trophic levels on top. When an ecosystem is healthy, this graph produces a standard ecological pyramid. This is because, in order for the ecosystem to sustain itself, there must be more ...
Ecological yield is the harvestable population growth of an ecosystem. It is most commonly measured in forestry : sustainable forestry is defined as that which does not harvest more wood in a year than has grown in that year, within a given patch of forest .
Global map of countries by Environmental Performance Index, 2024 [1]. The Environmental Performance Index (EPI) is a method of quantifying and numerically marking the environmental performance of a state's policies, highlightning the degradation of the planet's life-supporting systems on which humanity depends.
An economic input-output life-cycle assessment, or EIO-LCA involves the use of aggregate sector-level data to quantify the amount of environmental impact that can be directly attributed to each sector of the economy and how much each sector purchases from other sectors in producing its output.
In other words, it is a measure of the ecological efficiency at supporting well-being. [14] [15] Furthermore, the Happy Planet Index was criticized because the used data is not comprehensive enough. In the HPI Report of 2006 (by nef) they emphasized that they "were forced to estimate data on Footprint and life satisfaction for several countries".