![]() In this study the validation process presented good confirmation of a priori reference sites selection, showing that the proposed criteria could be considered as appropriate tools for characterization of the existent disturbance gradient in the Karun River Basin. A series of progressively increasing or decreasing differences in the growth rate, metabolism, or physiological activity of a cell, an organ, or an organism. Results in different seasons showed that all the least disturbed sites (n = 14) were significantly different from moderate and most disturbed sites (p < 0.01). The rate at which a physical quantity, such as temperature or pressure, changes relative to change in a given variable, especially distance. The metric Ephemeroptera, Plecoptera and Trichoptera (EPT) taxa was used for validation of the classification. ![]() Of the 54 sites, 14, 26 and 14 sites were classified as least, moderate and most disturbed sites, respectively. Principal components analysis (PCA) of 17 variables identified five variables that were influential across all seasons: conductivity, total habitat score, stream morphology, clay & silt, and sand. From the definition of the gradient as the increase in gravity by so many units per centimetre it follows that if we know the 1 The apparent contradiction. moving by steps walking as, gradient automata Gradientadjective. For this purpose, at each site, physical structure and physico-chemical data were collected once in each season for a total of 4 samples during the period (October 2018 - September 2019). Webster Dictionary(4.00 / 1 vote)Rate this definition: Gradientadjective. Herein, we describe an approach using water chemistry, physical structure and land use for identification of a disturbance gradient existing in the Karun River Basin. A physical, chemical and biological characterization of river systems is needed to evaluate their ecological quality and support restoration programs.
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