Abstract
The light assimilation curves of 10 Cuban macroscopic marine plants presented assimilation plateaus except for those few cases with photoinhibition due to excess light, high temperature, or water stagnation inside unshaken incubation bottles. The studied brown algae had an average compensation irradiance ( I k) value lower than the I k for both green algae and seagrasses. As bottles cannot be adequately agitated during in situ experiments at different depths, this type of field work should be designed only to determine relative photosynthesis values. Because of temperature increments due to artificial lighting, laboratory experiments should provide temperature control during incubations.
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