PJB-1983-10
Effects of emergence and salinity on the photosynthetic and respiratory activities of ulva fasciata delile (chlorophyta)
Mustafa
shameel
Abstract
The rates of photosynthesis and dark
respiration were measured in a littoral seaweed , ulva fasciata delile , gross photosynthesis and respiration initially increased during emergence , reached to a maximum at 20% desiccation and then gradually declined but the net photosybthesis constantly declined with
the rise in the intensity of desiccation . a pretreatment of U. fasciata with salinities between 40 and 60 % o increased the gross photosynthesis , which however decreased after exposure to salinities below 30% o and higher than 70 o. treatment with fresh water reduced respiration , which increased over the
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