Search results
Results From The WOW.Com Content Network
An environmental gradient, or climate gradient, is a change in abiotic (non-living) factors through space (or time). Environmental gradients can be related to factors such as altitude , depth, temperature , soil humidity and precipitation .
A gradsect or gradient-directed transect is a low-input, high-return sampling method where the aim is to maximise information about the distribution of biota in any area of study. Most living things are rarely distributed at random , their placement being largely determined by a hierarchy of environmental factors.
The program evaluation and review technique (PERT) is a statistical tool used in project management, which was designed to analyze and represent the tasks involved in completing a given project. PERT was originally developed by Charles E. Clark for the United States Navy in 1958; it is commonly used in conjunction with the Critical Path Method ...
Charts of the environmental lapse rate are known as thermodynamic diagrams, examples of which include Skew-T log-P diagrams and tephigrams. (See also Thermals ). The difference in moist adiabatic lapse rate and the dry rate is the cause of foehn wind phenomenon (also known as " Chinook winds " in parts of North America).
Environment Ministers of OECD member countries, at their meeting in January 1991, called on the OECD to start environmental performance reviews of member countries. This mandate was subsequently confirmed by the OECD Council meeting at Ministerial level in June 1991, and supported by the London G-7 economic summit in July 1991.
Species richness, or biodiversity, increases from the poles to the tropics for a wide variety of terrestrial and marine organisms, often referred to as the latitudinal diversity gradient. [1] The latitudinal diversity gradient is one of the most widely recognized patterns in ecology. [1] It has been observed to varying degrees in Earth's past. [2]
In a review of previous studies looking at elevational diversity gradients, Rahbek noted the importance of other factors contributing to the shape of a gradient, distinguishing elevational patterns from those described by the latitudinal diversity gradient. [3] For certain taxa and regions, there is a mid-elevational peak in species richness.
To facilitate environmental flow prescriptions, a number of computer models and tools have been developed by groups such as the USACE's Hydrologic Engineering Center Archived 2013-03-08 at the Wayback Machine to capture flow requirements defined in a workshop setting (e.g., HEC-RPT Archived 2022-01-18 at the Wayback Machine) or to evaluate the ...