Posidonia and climate change

Posidonia and climate change

Posidonia and climate change Impact of sea warming Rising water temperatures, one of the most obvious effects of climate change, pose a serious threat to the Posidonia oceanica. This marine plant is adapted to waters with a relatively stable and moderate temperature, so sustained increases in temperature can alter its delicate physiological processes, reducing its photosynthetic capacity and limiting its growth. In addition, warming seas can make Posidonia more susceptible to diseases and pests, thus accelerating its deterioration and decline. Ocean acidification Another effect of climate change that negatively impacts the Posidonia oceanica is the acidification of the oceans, caused by the increase of the absorption of atmospheric carbon dioxide by marine waters. This phenomenon alters the chemistry of the water and can affect the ability of marine plants, such as Posidonia, to form their calcareous structures. This can weaken the rhizomes and roots of the plant, making it more vulnerable to erosion and fragmentation of seagrass meadows. Sea level rise Sea level rise, caused by melting glaciers and thermal expansion of the oceans, also poses a risk to the Posidonia oceanica . As sea levels rise, Posidonia seagrass meadows can become shaded by a larger water column, reducing the availability of sunlight needed for photosynthesis. In addition, sea level rise can alter current dynamics and sedimentation patterns, affecting Posidonia's ability to colonise new habitats and regenerate damaged areas. Resilience and adaptation Despite the challenges posed by climate change, the Posidonia oceanica It has shown a certain capacity for adaptation and resilience. Some populations have managed to survive extreme weather events, such as marine heatwaves, and have developed mechanisms to cope with changes in environmental conditions. However, the speed and magnitude of climate change impacts could exceed the limits of adaptation of this plant, putting its long-term survival in the Mediterranean at risk.