. The algae. Algae. I V VII IX xi| i 1947 ' 1 1—r V VII IX 1948 Fig. 223 Annual variation of alginic acid (top) and mannitol (bottom) in Laminaria digitata and L. saccharina. Top: A—L. digitata (loch plants), B—the same (open sea), C-L. saccharina. Bottom: A—L. digitata (open sea), B—the same (loch plants). (After Black.) the littoral rockweeds (Fucales) and sub-littoral oarweeds (Lamin- ariales) of Europe. Regular analyses of plant populations have been made so that the results represent changes in the average composi- tion rather than those in a single individual. During the period of rapid
. The algae. Algae. I V VII IX xi| i 1947 ' 1 1—r V VII IX 1948 Fig. 223 Annual variation of alginic acid (top) and mannitol (bottom) in Laminaria digitata and L. saccharina. Top: A—L. digitata (loch plants), B—the same (open sea), C-L. saccharina. Bottom: A—L. digitata (open sea), B—the same (loch plants). (After Black.) the littoral rockweeds (Fucales) and sub-littoral oarweeds (Lamin- ariales) of Europe. Regular analyses of plant populations have been made so that the results represent changes in the average composi- tion rather than those in a single individual. During the period of rapid grov^h (spring) fresh weight, ash, protein content and alginic acid increase v^hilst laminarin and manitol behave in a reverse fashion (Fig. 222). The summer decrease in growth is correlated with the decrease of PO4 and NO3 in the sea at that time. During this period, however, the high photosynthetic rate permits the ac- cumulation of mannitol and laminarin (Fig. 223). The degree of the variations depends upon habitat, especially for Laminaria digitata and L. saccharina, being least in the open sea and greatest in lochs 423. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
