Cultivation ofLaminaria hyperborea in situ and in continuous darkness under laboratory conditions
- K. Lüning1
© Biologischen Anstalt Helgoland 1970
1. Two and three year old specimens ofLaminaria hyperborea were transplanted to sub-tidal growth stations at 2 and 6 m water depth, respectively.
2. Maximum growth rate occurred in early May in specimens growing at 2 m depth, and in early June at 2 m depth.
3. Frond area size, attained by the specimens growing at 6 m depth in July, was at least 75 % of frond area size attained at 2 m depth. Stipe length of plants at 6 m depth, as recorded in July, was only about 1/3 of the stipe length attained at 2 m depth.
4. Growth rates of new phylloids ofLaminaria hyperborea specimens kept in darkness from February until May are considerably reduced, if the old frond is amputated.