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Symbols used in the conceptual ecological model diagrams <br />Drivers / Drivers / SourCes: Major external driving forces that have large-scale <br />SOUI'Ces influences on natural systems. Can be natural or anthropogenic <br />Stressor StressOrS: Physical or chemical changes that are brought about by the <br />drivers, causing significant change in biological components, patterns, and <br />relationships in natural systems. <br />EcologiCal EffectS: Biological responses caused by the stressors. <br />Ecological <br />Effect <br />Attributes: A parsimonious subset of all potential biological elements or <br />components of natural systems that are representative of the overall ecological <br />Attribute conditions of the system. Attributes include populations, species, guilds, <br />communities, or processes, and are selected to represent the known or <br />hypothesized effects of the stressors and the efements of the systems that <br />have important human values. <br />PerFormance Measures: Specific features of the each attribute to be <br />Performance monitored to determine how well that attribute is responding to projects <br />Measure designed to correct the adverse effects of the stressors.