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MAIN V ARIATION TENDENCES IN THE LOTIC ECOSYSTEMS FROM SIERRA NEVADA (GRANADA, S-SPAIN) Physical, chemical and biological characteristics were studied from sixty-one samples taken in seven rivers of Sierra Nevada (S. Spain). Sampling took place in twenty-one stations from November 1980 to June 1981. The results obtained showed a progres~;ve increase of mineral salt content, heterotrophic bacteria! populations, coliform density, soluble phosphate and nitra te concentrations, and Margalef pigmentdoi:10.23818/actas.01.26 fatcat:bwbvluiqg5bb7hfrdup6yx5xz4