Effect of heat stress and darkness on gametophyte density.

Gametophyte density from the North Sea and Arctic populations of Laminaria digitata after 8 days in different treatments (15°C dark, 15°C, 20°C, 22.5°C, 25°C and 25°C DHS). Box plots with median, boxes for 25th and 75th percentiles and whiskers indicating min and max values (n = 4). No significant differences between treatments or populations were detected (excluding the 25°C treatment). See Table 1 for statistics.