EFFECTS OF SALINITY AND PESTlCI\)ES ON TilE MOIU'II0LOGY OF SOME MICHOSCOl'lC ALGAE

EFFECTS OF SALINITY AND PESTlCI\)ES ON TilE MOIU’II0LOGY
OF SOME MICHOSCOl’lC ALGAE
EZZAT 1\.. IBH.All1M.
National Institute of Oceanography and Fisheries. IIquatic Plants Lab .•
Zamalek Research Station. Cairo. Egypt.
AIJSTRACT
The effects of salinity, Baylusclde and Dlmethoate
on the morphology of the freshwater chlorophytes
Scenedesmus dimorphus (Trup.) Kuetzing, Scenedesmus
quadricauda (Trup.) de Breblsson, Anklstrodesmus
falcatus (Corda) Ralfs, and StaurastrUlll boreale
W. West and the marine diatom Amphlprora paludosa
W. Smith were Investugated, Sallnlty as represented
by NaCI caused significant increase· In cell size
accompanied by lysis In the cytoplasm. The Insecticide
Dlmethoate increased cell volume and size by rupturing
the cell wall, while the cytoplasm was obviously
shrinking. The mollusclclde Baylusclde slightly
reduced the ce 11 size and volume vIa rupture In
the cell wall; phenomena enhanced at high
concentrations.