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Various phenomena related to reproduction and recruitment in a population of Fucus distichus L. emend. Powell in Vancouver, British Columbia. Canada were evaluated. Using log linear analysis and tests for simple, multiple and partial associations, age and size were both found to be significant, but size slightly more so than age, as descriptors of reproductive events. Reproductive plants were found throughout the sampling period, from September 1985 to November 1987, but peaked in fall and winter of each year. Potential egg production, based on number of eggs produced per conceptacle and number of conceptacles per unit area of receptacle, is size-dependent. However, estimated monthly egg production, calculated by observed number of eggs in clusters extruded from the receptacle, is independent of plant size. Two types of recruits were monitored Microrecruits (< 1 mo-old of microscopic size) are germlings developed from fertilized eggs. Their numbers were assessed using settling blocks. Macrorecruits are detectable by the unaided eye and are plants appearing in the permanent quadrats for the first time. They can first be detected when about 3 to 4 mo old. The recruitment pattern of microrecruits is significantly correlated with reproductive phenology and patterns of potential and estimated monthly egg production. The pattern of recruitment of macrorecruits is negatively correlated with reproductive phenology and that of the estimated monthly egg production. Peaks in microrecruitment are not always followed by peaks in macro-recruitment. This apparent discrepancy is probably due to a differential survivorship of microrecruits over time or to the possible existence of a 'germling bank'. Patterns of survival and emergence of macrorecruits may be independent of those of microrecruits or may be unrelated to the prevailing reproductive phenology.

Natural dynamics of a Fucus distichus (Phaeophyceae, Fucales) population: reproduction and recruitment