Intraspecific variation in Potamogeton pectinatus L.: a controlled laboratory experiment

In a controlled laboratory experiment, the question was addressed whether intraspecific variation in Potamogeton pectinatus L. has a genotypic component. Two populations from contrasting habitats in The Netherlands were tested, one habitat was the exposed and eutrophic freshwater Lake Veluwe and the other a brackish ditch on the island of Texel. Weight frequency distributions of the natural tuber banks in spring were significantly different, while tuber specific densities (weight per volume) were not.