{"refrec":{"BRefID":37571,"RR":"<b>Peelen, R.</b> (1975). Changes in the composition of the plankton of the rivers Rhine and Meuse in the Netherlands during the last fifty-five years. <i>Verh. - Int. Ver. Theor. Angew. Limnol. 19</i>: 1997-2009","BEntID":37571,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Verh. - Int. Ver. Theor. Angew. 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Compared with 1916 an increase in total numbers has taken place. The closure of the Haringvliet-the estuarine end of both rivers-caused another increase in numbers, as the residence time of the plankters within this area was increased. 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