Premium
Effet de l'enrichissement continu en nitrates sur les populations de Diatomées isolées à l'aide d'enceintes expérimentales placées dans un étang oligotrophe
Author(s) -
le Cohu René
Publication year - 1976
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19760610605
Subject(s) - fragilaria , diatom , chemistry , biology , botany , ecology , nutrient , phytoplankton
The influence of nitrates (NH 4 NO 3 KNO 3 and Ca(NO 3)2 ) on Diatom populations has been studied. These populations were isolated by enclosures with transparent walls, without bottom or lid, placed in an oligotrophic pond. The addition of NH 4 NO 3 generally resulted in a decrease in the number of Diatoms and the disappearance of some species. The addition of KNO 3 and Ca(NO 3)2 was followed, during some periods, by a very important increase of Achnanthes minutissima, Fragilaria construens and Gomphonema parvulum .