The Effects of UV Radiation on Chloroplast Clumping and Photosynthesis in the Seagrass Halophila stipulacea Grown under High-PAR Conditions

Table 1

Midday values of PAR and UVR and percentage transmittances (%) of the in situ downwelling (at 6 and 30 m) and 50%-shaded water-table (under the control- and UV-filters) PAR (400–700 nm) and UVR (300–400 nm). The water-table values were measured on April 10, 2007, and the in situ values were measured on April 1, 2008, offshore the IUI, with the PRR-800 profiling radiometer (BioSpherical Instruments).

	PAR		UVR
	(μmol photons m^−2 s^−1)	(%)	(μW m^−2)	(%)
In situ, 6 m	750	45	2116	50
In situ, 30 m	90	5	134	3.0
Water-table + control-filter	860	45	2132	41
Water-table + UV-filter	860	45	192	7.4