RT Journal Article ID 36327d562281b9ad A1 Shkundina, F. B. T1 Ecological groups of the Belaya River phytoplankton JF International Journal on Algae JO IJA YR 2004 FD 2004-08-24 VO 6 IS 2 SP 140 OP 150 AB The problem of major ecological groups of the river phytoplankton species revealed in a number of cases by compound complex gradients is discussed. Niche width indices are used. An attempt is made to construct a species gradient inside ecological groups by means of several chemical factors for the Belaya River phytoplankton using canonic ordination. The species spectrum is obtained from the concentration of ammonium nitrogen. PB Begell House LK https://www.dl.begellhouse.com/journals/7dd4467e7de5b7ef,31fa5e5c1ac588ce,36327d562281b9ad.html