BIOLOGY OF SEAWEEDS OF ECONOMIC IMPORTANCE
227
the standing crop. There is always the possibility, however, that some
environmental change or fungal or bacterial disease may seriously
deplete the underwater beds of seaweed. Continued intensive harvesting over the years may affect the ability of the plant populations to
withstand any future depredations. The need for conservation should
be an essential part of any planning of large-scale exploitation of marine
dgae. There are cases where this need has been discovered at too late a
Stage for effective measures to be taken. Whilst there are many aspecta
of the biology of the economically important seaweeds which remain
to be fully explored, a welcome trend in recent years hm beea shown in
those studies which have linked taxonomic observations with the
seasonal life of the plants in different habitats, with a close watch on
the cycles of growth and regeneration, and on the morphological
changes which may be involved. Work of this nature, together
with studies on plant biochemistry, can lead to a more effective
exploitation of the available resources.
XII. REFERENCES
(All references marked with an asterisk are in Japanese with Englieh summaries.)
Akamsin, A. D., Parchevskii, V. P., and Polikarpov, G. G. (1960). ‘Vodorosl
nakaplivaet radioaktivnost’. Priroda, 2, 96-6.
Akiyama, K. (1960). ArtiGcial multiplication of ConchoceZia-thallm of Porphyra.
Bull. Tohoku. Reg. Fiah. Lab. 17, 46-8.
Aleem, A. A. (1966a). A quantitative study of the benthic communities inhabiting
the kelp beds off the California coast with a self-contained breathing
apparatus. Proc. 2 Int. Seaweed Sym., Abs., 149-62.
Aleem, A. A. (1966b). Quantitative underwater study of the benthic communities inhabiting kelp beds off California. Science, N.S. 123, 183.
Alfimov, N. N. (1961). 0 vozmozhnosti ispol’ zovaniya vodoroslevoi muki dlya
povysheniya pischchevoi tsennosti khleba. Bot. Zhur. 46, 1660-4.
Anderson, G. W. (1962). A note on the seaweed resources of Zanzibar Protectorate. Proc. 1 Int. Seaweed Sym. 102-3.
*Ando, Y., and Inoue, K. (1961). Decomposition of alginic acid by microorganisms--Iv. On the &brio-type bacteria, newly isolated from the
decaying Laminaria. Bull. Jap. SOC. Sci. Fiah. 27, 339-41.
hasaki, S. (1947). Studies on the rot of Porphyra temra by 8 Pythium (In
Japanese). J. Jap. Soc. Fiah. 13, 7490.
*Arm&, S. (1960). A chytridean parasite on the Porphyra. Bull. Jap. SOC. Sci.
Fiah. 26, 643-8.
Arasaki, S., and Shihira, I. (1969). Variability of morphological structure and
mode of reproduction in Enteromorpha Zinzcr. Jap. J. Bot. 17, 92-100.
*hasaki, S., Fujiyama, T., and Saito, Y. (1966). On the relation between the
appearance of spores of the laver (Porphyra tenera) and the environmental
conditions-11.
Bull. Jap. SOC. Sci. Fiah. 22, 167-71.
227
the standing crop. There is always the possibility, however, that some
environmental change or fungal or bacterial disease may seriously
deplete the underwater beds of seaweed. Continued intensive harvesting over the years may affect the ability of the plant populations to
withstand any future depredations. The need for conservation should
be an essential part of any planning of large-scale exploitation of marine
dgae. There are cases where this need has been discovered at too late a
Stage for effective measures to be taken. Whilst there are many aspecta
of the biology of the economically important seaweeds which remain
to be fully explored, a welcome trend in recent years hm beea shown in
those studies which have linked taxonomic observations with the
seasonal life of the plants in different habitats, with a close watch on
the cycles of growth and regeneration, and on the morphological
changes which may be involved. Work of this nature, together
with studies on plant biochemistry, can lead to a more effective
exploitation of the available resources.
XII. REFERENCES
(All references marked with an asterisk are in Japanese with Englieh summaries.)
Akamsin, A. D., Parchevskii, V. P., and Polikarpov, G. G. (1960). ‘Vodorosl
nakaplivaet radioaktivnost’. Priroda, 2, 96-6.
Akiyama, K. (1960). ArtiGcial multiplication of ConchoceZia-thallm of Porphyra.
Bull. Tohoku. Reg. Fiah. Lab. 17, 46-8.
Aleem, A. A. (1966a). A quantitative study of the benthic communities inhabiting
the kelp beds off the California coast with a self-contained breathing
apparatus. Proc. 2 Int. Seaweed Sym., Abs., 149-62.
Aleem, A. A. (1966b). Quantitative underwater study of the benthic communities inhabiting kelp beds off California. Science, N.S. 123, 183.
Alfimov, N. N. (1961). 0 vozmozhnosti ispol’ zovaniya vodoroslevoi muki dlya
povysheniya pischchevoi tsennosti khleba. Bot. Zhur. 46, 1660-4.
Anderson, G. W. (1962). A note on the seaweed resources of Zanzibar Protectorate. Proc. 1 Int. Seaweed Sym. 102-3.
*Ando, Y., and Inoue, K. (1961). Decomposition of alginic acid by microorganisms--Iv. On the &brio-type bacteria, newly isolated from the
decaying Laminaria. Bull. Jap. SOC. Sci. Fiah. 27, 339-41.
hasaki, S. (1947). Studies on the rot of Porphyra temra by 8 Pythium (In
Japanese). J. Jap. Soc. Fiah. 13, 7490.
*Arm&, S. (1960). A chytridean parasite on the Porphyra. Bull. Jap. SOC. Sci.
Fiah. 26, 643-8.
Arasaki, S., and Shihira, I. (1969). Variability of morphological structure and
mode of reproduction in Enteromorpha Zinzcr. Jap. J. Bot. 17, 92-100.
*hasaki, S., Fujiyama, T., and Saito, Y. (1966). On the relation between the
appearance of spores of the laver (Porphyra tenera) and the environmental
conditions-11.
Bull. Jap. SOC. Sci. Fiah. 22, 167-71.