Short shoot density and blade width were significantly lower while chlorophyll a levels were significantly higher in a deep (6 to 8 m) Thalassia testudinum bed when compared to a (1 m) shallow bed. Although the above and below ground biomass was significantly higher in
the shallow bed, there were no differences in the ratios of above to below ground portions of the cores or individual unit plants. No significant patterns in compensation point (Ic), saturation irradiance (Ik), and linear slope of the curve (α) were evident for
plants from the deep and shallow water beds. The findings suggest an irradiance-depth limitation and that T. testudinum does not photoacclimate through shifts in P-I factors.
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