The health of the seas surrounding the Iberian Peninsula and the Mediterranean is a barometer of the planet's condition. In recent years, Marine biodiversity in Spain faces growing challengesBut it also represents an unprecedented mobilization of scientists, government agencies, and citizens. From the Posidonia seagrass meadows to the Andalusian ports, and along the Basque coast, numerous initiatives are underway seeking to understand, protect, and restore underwater ecosystems.
Climate change, the arrival of exotic species, and human pressure are transforming the coastline. However, The response was swift: European mass sampling projects, educational workshops on board traditional boats, and awareness campaigns. They demonstrate that marine conservation has become a shared priority. Below, we review the main fronts in the fight to preserve the underwater wealth of Spain and Europe.
Posidonia, a pillar of the Mediterranean
In the Mediterranean, Posidonia oceanica is much more than a marine plant. Considered the "lungs" of this sea, Its meadows generate oxygen, filter water, and serve as shelter. to hundreds of speciesFor this reason, both government agencies and environmental organizations have made it a symbol of conservation. In the Balearic Islands, the Directorate General for the Natural Environment has organized educational outings aboard the traditional lateen-rigged boat La Balear so that participants can discover the importance of Posidonia seagrass and plankton, measuring parameters such as water temperature and salinity. These sessions, which have brought together around one hundred people, aim to to promote direct knowledge of the marine environment and the need to protect it.
Climate change and invasive species, two major threats
Global warming is altering the oceans at an accelerated rate. According to the United Nations' third global ocean assessment, Sea levels are rising at a rate of 4,3 mm per year and tropical seas are thermally expanding.While Arctic sea ice could disappear by mid-century, these changes directly affect biodiversity: habitat loss, acidification, and rising water temperatures alter the living conditions of native species. In Spain, Pablo Sánchez-Jerez, a professor at the University of Alicante and co-author of the report, emphasized that the ocean modulates the global climate and food supply, so its deterioration has cascading consequences.
One of the most visible consequences of climate change is the proliferation of invasive alien species. On the Basque coast, the Asian seaweed Rugulopteryx okamurae has colonized ports and beaches. displacing native algae and reducing fish biomassFirst detected in Ceuta in 2015, it has spread throughout the Cantabrian Sea and the Mediterranean, forming mats that disrupt the ecosystem and generate cleaning costs. Faced with this threat, ports have become sentinel points: in Andalusia, the University Institute of Marine Research at the University of Cádiz has installed experimental panels in the Marina del Este port to compare the biodiversity of the port interior with that of nearby natural spaces and to detect the arrival of new exotic species early. The combination of these studies allows us to anticipate the spread of invasive species and design control strategies.
Monitoring and citizen science to protect the sea
To address these challenges, science has taken a significant step forward with large-scale projects. The European project BIOcean5D, based on the TREC/Tara Europe expedition, has collected more than 70,000 samples across 21 coastal countries, from the Arctic to the Mediterranean. The information obtained has been integrated into an open access data center This approach harmonizes everything from molecular analyses to acoustic recordings, enabling the development of tools such as the JEDI metabarcoding marker for biodiversity monitoring. This collaborative approach, involving scientists, policymakers, and citizens, lays the foundation for a European coastal monitoring network.
At the local level, collaboration between ports and universities is bearing fruit. In Marina del Este, in addition to the monitoring panels, other equipment has been installed. biomimetic micro-reefs that mimic the functioning of natural reefs. The first results show a 79% increase in species richness and the generation of biomass, demonstrating that it is possible to restore biodiversity even in port environments. These experiences, along with educational workshops in the Balearic Islands and tattoo campaigns in the Mediterranean, reflect a shift in trend: marine conservation is no longer just the domain of experts, but involves the whole of society.
The protection of marine biodiversity in Spain and Europe is progressing on several fronts. From environmental education to cutting-edge science, including the fight against invasive species and climate change, Each initiative contributes a grain of sand to preserving underwater ecosystems.The key lies in collaboration between government agencies, researchers, and citizens, and in the awareness that what happens beneath the sea directly affects our lives on land. The road is long, but the steps being taken offer reasons for hope.
