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The effects of salinity and temperature on the photosynthetic and growth performance of the seagrasses  Cymodocea nodosa  and  Ruppia cirrhosa  were studied to understand their local seasonality and distribution.  Cymodocea nodosa  shoots were collected from Cape Vrasidas, and  R. cirrhosa  shoots from the coastal lagoon Fanari, all from the Eastern Macedonian and Thrace Region, Greece. Effective quantum yield (ΔF/Fm′), leaf chlorophyll- a  content (mg g −1  wet mass) and growth (% of maximum) were tested at different temperatures (10–40°C) and salinities (5–60). The results showed that: (a)  R. cirrhosa  was more euryhaline (5–55/60) than  C. nodosa  (10–50), (b) the upper thermal tolerance of  C. nodosa  (34–35°C) was higher than that of  R. cirrhosa  (32–34°C), (c)  C. nodosa  could not tolerate 10°C, whereas  R. cirrhosa  could, and (d) the growth optimum of  C. nodosa  was 30°C and that of  R. cirrhosa  20–30°C. The thermal optima and tolerances of growth and photosynthesis confirm the seasonal patterns of  R. cirrhosa  but not of  C. nodosa . However, the sensitivity of  C. nodosa  to low salinities and temperatures may explain its absence from shallow coastal lagoons.  Ruppia cirrhosa  could be vulnerable to future climate change.

Effects of salinity and temperature on the performance of Cymodocea nodosa and Ruppia cirrhosa : a medium-term laboratory study