Abstract
A method for analyzing the phytosociological structure of seaweed communities using measured line transects, or line transects with subsidiary point sampling, is described. The methods are applied to communities on the shores of Nova Scotia to investigate the spread of the introduced species, F. serratus L., which has been rapid in some areas but slow in others. The study found no evidence that its invasion into new areas has been slowed by competition from Chondrus crispus Stackh., but it did find evidence that competition from F edentatus Pyl. has probably been an important factor.

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