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Seasonal patterns in thallus length, biomass, reproduction, total biomass m -2  and size structure were monitored in populations of  Dictyota cervicornis  and  Stoechospermum polypodioides  on a shallow reef flat in the southern Red Sea. These tropical reef flats are exposed to extreme temperatures of about 34°C in summer and to temperatures of about 25°C in winter. Both species showed peaks in length, biomass and reproduction in winter; macrothalli were absent in summer. Thallus length, biomass and the proportion of reproductive thalli showed a strong negative correlation with seawater temperature. Young thalli first appeared in November, following a drop in seawater temperature from about 33 to 31°C. Macroscopic thalli had disappeared in May, when temperatures had reached the same values as those at the start of the growth season (33°C). When reef substrata collected in summer were kept at sub-ambient temperatures (29–31°C), macroscopic thalli of  D. cervicornis  developed. Size structure varied over time, probably because of non-synchronous development and tissue loss among thalli. Reproduction was size-dependent. We conclude that  D. cervicornis  and  S. polypodioides  have highly seasonal patterns of growth and reproduction related to the seasonal variation in the environment, especially temperature.

botanica marina

Seasonal patterns of biomass, growth and reproduction in  Dictyota cervicornis  and  Stoechospermum polypodioides  (Dictyotales, Phaeophyta) on a shallow reef flat in the southern Red Sea (Eritrea)