The photosynthetic carbon uptake and oxygen release of seagrasses is quite extensively studied. But what factors affect the coinciding carbon dioxide release and oxygen consumption by respiration? And how could this process affect the carbon- and oxygen balance in coastal ecosystems?

This is examined in this thesis where certain factors with potential effect on the respiration (and to some extent photorespiration) such as light irradiance, time of day, tissue age, temperature and carbon availability, were assessed. The results show that the oxygen consumption of the seagrasses is highly variable according to these factors. As respiratory rates typically have been obtained in darkness, and the rates have been considered constant over the day, these results can be highly important when estimating accurate coastal carbon budgets.

Lina Rasmusson is defending her thesis. Faculty opponent is Jonas Collén, Université Pierre et Marie Curie, Station Biologique de Roscoff.

All welcome!