GRIMAUD , Ghjuvan Micaelu

Unicellular photosynthetic organisms forming the phytoplankton are the basis of primary production. Because these organisms cannot regulate their inner temperature, the medium temperature strongly constrains their growth. Understanding the impact of this factor is topical in a global change context. In this PhD thesis we have investigated how...

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We developed a simple phytoplankton thermal evolutionary model using the Adaptive Dynamics method.We validated the model on 57 phytoplankton growth rate versus temperature data sets.The evolutionary optimal growth rate for a given species is higher than the mean annual temperature and depends on the annual temperature fluctuations.Some areas...

Phytoplankton are ectotherms and are thus directly influenced by temperature. They experience temporal variation in temperature which results in a selection pressure. Using the Adaptive Dynamics theory and an optimization method, we study phytoplankton thermal adaptation (more particulary the evolution of the optimal growth temperature) to...

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Temperature plays a key role in outdoor industrial cultivation of microalgae. Improving the thermal tolerance of microalgae to both daily and seasonal temperature fluctuations can thus contribute to increase their annual productivity. A long term selection experiment was carried out to increase the thermal niche (temperature range for which the...