Abstract
The distribution of Himanthalia elongata has been surveyed along the north-east coast of England. The species grows on a wide variety of geological substrata where they are weathered into horizontal ledges near l.w.s.t. Laboratory culture experiments have shown that a slight decrease in salinity decreases the percentage of germination and below a salinity equal to 50% sea water no germination occurs. Very few zygotes germinate in total darkness. With increased light intensity at 10 °C the highest percentage germination was obtained at approximately 6000 lux. Maximum growth of young germlings was obtained at about 10 °C and 1272 lux under a 16 8 hour light/ dark period. Silt appears to be a major factor inhibiting colonization along stretches of the north-east coat. It acts by cutting down the amount of light received by the zygotes and also it forms a substratum of fine particles to which the zygotes, with their highly specialized mode of adhesion, are unable to become attached.
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