抄録
The influence of temperature, light intensity, salinity
and nutrient concentration (including NO3- and PO4-)
on the early stage of the erect thalli of Cladoszphon okamuranus
Tokida were investigated in laboratory culture. The erect thalli formed in
the range of 20-30 °C,75-260 μmol m-2 s-1, 22-50 ‰,
and at nutrient concentrations of 3.1-104 μM NO3-
and 0.1-15.1 μM PO4-. The highest growth was
observed at 22.5 °C, 260 μmol
m-2 s-1, 34 ‰,
and at nutrient concentrations of 16.2-44.2 μM NO3-
and 1.9-6.0 μM PO4-.
The color of the branches and shape of the thallus was darkened and
crumbled with an increase in NO3-
concentrations of over 56.8 μM and 7.9 μM PO4-.
The thalli did not grow more than 1cm in length at those nutrient
concentrations. From these results, C. okamuranus erect
thalli was shown to have minimal adaptability to high nutrient
concentrations in enriched seawater media. This is the first report of the
affects of nutrient concentrations on the growth of the erect thallus of C.
okamuranus.
