By M. J. Dring

This booklet presents an advent to fresh analytical and experimental reports of plant development within the sea. The body structure and ecology of marine crops are, accordingly, emphasised.

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Brook). One temperature probe at each height (a) was exposed to the air about 3 cm above the rock surface, and a second (b) was located under a stone at the same height. The predicted tidal curve for the same day (c) shows the approximate times of submersion and emersion at each height. environmental boundary. Above this level, the duration of emersion in each tidal cycle, and the severity of the resulting temperature and desiccation stress, will increase gradually with height up the shore (Fig.

25) can be determined by potentiometric titration, and is more or less constant in relation to salinity. 070 in most ocean waters. 415 meq I"1. In uncontaminated sea water, the only ions, other than carbonates, which contribute significantly to this total alkalinity are those of boric acid, but their contribution amounts to only between 1 and 6% in the normal pH range of sea water. 325 meq I"1 as the carbonate alkalinity. 3). All the other components of the CO2-system can now be calculated from these two values.

2). Some of the energy absorbed by PS II, however, can be transferred to PS I, so that both light reactions can operate, but maximum efficiency is achieved only when both photosystems are irradiated together. PIGMENTS AND PHOTOSYNTHESIS IN MARINE PLANTS A superficial examination of the seaweeds of a rocky shore is enough to establish an important distinction between marine plants and terrestrial plants. The vegetative parts of the vast majority of the land flora are green, but plants growing in the sea are far more varied in colour.

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