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The activity was linked to the COSEA App, an application promoted by the EFFECTIVE project and developed using SPOTTERON Citizen Science technology. This tool allows users to record observations of the marine and coastal environment and share them with the community, making it easier for different audiences to take part in the collection of environmental data.

During the day, the students were divided into groups and, with the support of field guides, explored the beach to identify and register any species, marine litter or habitats they found. In total, 42 new observations were recorded through the app: 16 on coastal species (including birds, fishes, shells, and algae), 23 on pollution and human impacts, 1 on water quality and 2 on habitat.

The day included three rotating activities led by the technical team coordinating the event. Ocean Ecostructures was represented by Núria Trilla, Sol Anglada and Edna Pacareu. Lucía Millán, from the Institute of Marine Sciences, ICM-CSIC, also took part in the activity.

At Espai Blau in Masnou Port, students received a talk and short presentation on the coralligenous habitats in the Mediterranean, benthic habitats and the importance of communities such as gorgonians, as well as the threats these ecosystems face, particularly marine heatwaves and mass mortality events. The session, led by Lucía Millán, also highlighted the importance of monitoring to obtain real, measurable follow-up data on the state of marine ecosystems and renaturalisation actions.

During the second part of the presentation, Núria Trilla, provided context on the EFFECTIVE Pilot 1 technology, Ocean Ecostructures’ Life Boosting Units (LBUs). This technology, based on scalable marine regeneration solutions is designed to increase habitat diversity, promote the settlement of benthic organisms and create refuge areas for the development of marine life, including juvenile fish.

In a second part of the session, the students visited the dock to see the installed marine structures and learn first-hand about the monitoring work carried out with an ROV, guided by Sol Anglada, an expert in underwater ROV piloting. This allowed the students to connect the observations made on the beach with the regeneration and monitoring solutions promoted by the project.

The BioMarathon was an opportunity to show how citizen science, digital tools and environmental education can contribute to generating knowledge about the marine environment.

Through the COSEA App, the students became marine explorers for a day and actively contributed to the observation and protection of the coastline.

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The research, conducted by MSc student Nikol Mode, investigated the composition and abundance of meiobenthic communities inhabiting coral reefs and adjacent habitats. Sampling took place during October 2024 and March 2025 at two coral reef stations (Vasiliki and Kryo Nero) and a control station without corals (Blue Lagoon). 

The study identified 20 meiobenthic taxonomic groups and revealed higher organism abundances in coral-associated habitats, while sponge samples supported the highest biodiversity. Community composition differed among sites, highlighting the influence of local environmental conditions and habitat heterogeneity. 

The results demonstrate that meiobenthic communities are highly sensitive bioindicators of environmental quality and ecosystem functioning. These findings provide valuable information for monitoring restoration actions and assessing ecological status within Marine Protected Areas, supporting the broader objectives of the EFFECTIVE project. 

The study was conducted within the framework of EFFECTIVE Pilot 4 through collaboration between HCMR and CMMI, demonstrating how the project supports both scientific research and the training of early-career marine scientists. 

Congratulations to Nikol Mode and the HCMR and CMMI teams for this valuable contribution to Pilot 4 and to the scientific understanding of Mediterranean coral reef ecosystems. 

Further information: The full MSc thesis (available in Greek) can be accessed here through the University of Crete repository. 

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Significant progress has already been achieved. During the week of 3–7 November 2025, 22 LBUs were successfully deployed at Club Nàutic L’Estartit across three zones: five units at the harbour entrance, nine at the central pier, and eight at the floating pier. In the floating pier area, an innovative clamp-based fixation system attached to cylindrical columns was implemented and validated, improving both stability and installation efficiency. Environmental sensors measuring temperature and light were installed in each zone to generate continuous datasets for interpreting ecological trends. In collaboration with CSIC scientists (ICM and CEAB), targeted restocking actions introduced five plates of Cystoseira and seven plates of Leptogorgia, carefully distributed according to ecological requirements. A comprehensive baseline monitoring campaign was also conducted, including ROV inspections, in situ multiparametric measurements, and water sampling for nutrients, microplastics, hydrocarbons, and other water quality indicators, establishing a robust reference for future comparisons.

Early monitoring results are encouraging. A follow-up survey carried out on 14 January 2026 assessed structural integrity and early biological colonisation. All units remain stable, with no signs of displacement or degradation, confirming the robustness of both the design and the innovative anchoring system under real operating conditions. ROV footage is currently being analysed to quantify biodiversity and colonisation patterns, providing the foundation for upcoming ecological assessments. Initial water quality analyses have also been completed, offering valuable environmental baseline data. Together, these early findings indicate that the pilot is progressing as planned and that the systems are performing reliably.

One of the main challenges has been navigating the complex authorisation and permitting processes required for marine restoration activities within regulated port and coastal environments. The team is addressing this through ongoing coordination with port authorities, environmental agencies, and local stakeholders to ensure alignment with regulatory frameworks and conservation objectives.

Looking ahead, the pilot will continue its scheduled monitoring campaigns to track structural performance and ecological succession. The analysis of the first ROV survey will deliver the initial biodiversity results, which will be shared through the EFFECTIVE digital platform via API integration between the Ocean Ecostructures system and the project infrastructure managed by CTN. This integration directly supports EFFECTIVE’s broader objective of connecting local pilot actions with a scalable digital framework, enabling data-driven decision-making, knowledge transfer, and replication across other pilot areas.In parallel, the pilot will expand its education and citizen science activities, including local school workshops linked to marine restoration efforts and CoaseaApp features. The site will also host a consortium meeting at Pilot Area 1, complemented by workshops and joint awareness-raising activities with Espai Medes, focused on marine conservation, community engagement, and sensitisation. By combining ecological restoration, digital innovation, stakeholder engagement, and policy alignment, Pilot Area 1 exemplifies the EFFECTIVE approach: transforming site-based interventions into measurable, transferable solutions that contribute to healthier marine ecosystems and more sustainable coastal management across Europe.

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This pilot focuses on the restoration and long-term conservation of gorgonian coral communities around Tavolara Island in northern Sardinia, within the Tavolara–Punta Coda Cavallo Marine Protected Area and the Maddalena Archipelago National Park. The main objective is to enhance the resilience of key Mediterranean gorgonian species (Eunicella cavolini and Paramuricea clavata) in the face of climate change by combining active restoration actions with a robust early-warning and continuous monitoring programme for thermal stress events.

Significant progress has been made across restoration, monitoring, research, and community engagement activities. Field studies were conducted to identify priority areas with the highest recovery potential, followed by targeted restoration actions including cleaning, repopulation, and relocation of gorgonian colonies. These interventions are supported by ongoing studies on colony growth and survival, enabling the evaluation of restoration success over time. In parallel, a permanent monitoring network was established based on sentinel stations that continuously record environmental conditions and allow for the early detection of thermal stress events.

Several complementary scientific studies are being carried out alongside these actions. These include oxidative stress analyses in collaboration with the University of Cádiz, holobiont research led by CIC Barcelona, detailed mapping of coral distribution, studies on population growth bioindicators, and the integration of remote sensing data to better understand large-scale environmental dynamics. Outreach and communication activities have also been developed to share the project’s objectives and results with local communities, encouraging active participation and long-term stewardship of these vulnerable ecosystems.

Early results demonstrate a clear and positive response of gorgonian corals to the sanitation and recovery programme. Most treated colonies showed branch regrowth, improved colony structure, and a marked reduction in visible pathologies. Over the two years of the project, strong recruitment has been recorded across the study area, indicating active natural regeneration and a high recovery potential. These findings confirm that targeted restoration actions can effectively support coral recovery, even in systems already under climate stress. At the same time, the pilot has highlighted the limits of management interventions during extremely intense and rapidly developing thermal stress events, which can cause severe damage before mitigation measures can be fully implemented. Depth was also identified as a key factor influencing resilience, with deeper zones generally providing more stable thermal conditions. Close collaboration with local managers and stakeholders has been essential in reinforcing protection measures and supporting long-term conservation.

The pilot has faced significant challenges, most notably a mass mortality event in late September 2025. While investigations into the exact causes are ongoing, prolonged marine heatwaves and broader climate-driven changes in the Mediterranean are likely to have played a major role. This event underscored the vulnerability of gorgonian coral ecosystems and the speed at which conditions can deteriorate. In response, efforts are being intensified to reinforce early-warning systems, expand monitoring, and prioritise strategies that reduce damage and support faster recovery during extreme events.

In the coming months, the focus will be on completing ongoing studies and collaborations, while continuing to monitor restored sites and further refine early-warning systems. Restoration actions will be adapted based on the insights gained to date, alongside efforts to strengthen partnerships with scientific institutions and local stakeholders. The overarching goal is to enhance long-term resilience, improve preparedness for future climate extremes, and share lessons learned from Tavolara as a replicable model for adapting Mediterranean coral ecosystems to climate change.

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Pilot 2 is implemented in the Ebro Delta Bays (Els Alfacs and El Fangar, northeast Spain), a Natura 2000 Marine Protected Area under strong pressure from rice agriculture, aquaculture, and climate change. The pilot’s main objective is to restore degraded shallow coastal and marine habitats, improve water quality and ecosystem resilience, and support sustainable aquaculture. To achieve this, an integrated nature-based restoration scheme is being tested, combining a constructed wetland, seabed remediation, seagrass recovery strategies, and innovative solutions to mitigate summer hypoxia that affects aquaculture activities.

Despite some implementation delays, several key milestones have already been achieved. A representative restoration site in Els Alfacs Bay was selected in close collaboration with local stakeholders. For the first time in this shallow coastal area, bathymetry and sediment thickness data were generated, alongside sediment characterisation and bi-monthly water quality monitoring. These data informed the development of an executive project for a constructed wetland and seabed remediation, which has been formally submitted for permitting. In parallel, the Eurecat team tested an innovative oxygenation system on a mussel platform in Fangar Bay to mitigate summer hypoxia and carried out field surveys and environmental diagnostics of Cymodocea nodosa seagrass meadows to assess their restoration potential. Continuous engagement with local stakeholders—including irrigation communities, the aquaculture sector, Natural Park authorities, and regional government—has accompanied all stages of the pilot.

Early results indicate that long-term accumulation of fine organic mud and freshwater inputs from rice drainage channels are key drivers of habitat degradation and eutrophication in shallow bay areas. The oxygenation system proved technically capable of increasing dissolved oxygen at the outlet, but its limited effects at farm scale highlighted the challenges of improving oxygen conditions in open-water aquaculture systems.

Several important lessons have emerged. Small-scale pilots are essential for validating the feasibility of nature-based solutions, yet isolating interventions from broader environmental pressures remains difficult. Another key insight is that technical feasibility must be closely aligned with governance frameworks. Ongoing dialogue with local stakeholders has been crucial, particularly in managing expectations around restoration implementation and in testing innovative approaches such as oxygenation systems and artificial biotopes.

The pilot has faced significant challenges, including working in very shallow marine environments, navigating regulatory constraints within a protected public area, and adapting to external infrastructure developments such as the construction of a new coastal dike by the regional government. While these factors have delayed implementation, they have also created new opportunities, with the constructed wetland now being discussed as a complementary nature-based solution for coastal protection. Technical challenges are being addressed through adaptive engineering solutions, close coordination with authorities, and alignment with regional climate adaptation plans.

Looking ahead, the next phase will focus on finalising permit approvals and strengthening alignment with regional authorities, followed by the tendering and implementation of the constructed wetland and seabed remediation works. In parallel, activities will continue on passive seagrass restoration planning, improved habitat mapping, and stakeholder co-design. The Eurecat team will also continue to strengthen partnerships with regional authorities and local stakeholders, with the aim of scaling up successful solutions across the Ebro Delta Bays and positioning the pilot as a replicable Mediterranean nature-based solutions case.

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The EFFECTIVE European Horizon project workshop took place on October 27, at the Centro Polivalente of the Municipality of Cabras. The event was organised by the One Ocean Foundation, in collaboration with the Marine Protected Area “Penisola del Sinis – Isola di Mal di Ventre” and the La Maddalena Archipelago National Park.

The workshop aimed to identify key environmental pressures affecting protected areas, using the 11 Good Environmental Status (GES) indicators defined by the EU Marine Strategy Framework Directive. Applying these indicators at a local level relies on the expertise and on-the-ground experience of those working in the area.

The event opened and closed with remarks from the Mayor of Cabras and featured strong participation from the Sardinian research community, including professors from the University of Sassari, researchers from the International Marine Center and CNR-IAS of Oristano, alongside the active contribution of the Marine Protected Area “Penisola del Sinis – Isola di Mal di Ventre.”

This workshop marks the first step in a wider, ongoing process that will continue to engage these stakeholders in future project phases, with the aim of strengthening the management and effectiveness of Marine Protected Areas (MPAs).

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Pilot 4 aims to implement a restoration solution in Cyprus to revive the coral populations of the endangered coral species Cladocora caespitosa.

Cladocora caespitosa is a scleractinian coral species endemic to the Mediterranean Sea. It now exhibits a patchy distribution along the Mediterranean Sea, with no true reefs, but in some cases large bioconstructions. In Cyprus, this coral species faces increased vulnerability because its colonies typically occur at depths of less than 5 meters. At such shallow waters, they are exposed to pronounced temperature fluctuations, as well as erosion, sedimentation, extreme climatic events (such as windstorms), and human-induced disturbances. Consequently, urgent measures are required to safeguard this endangered species. 

Under Pilot 4 for the EFFECTIVE project, CMMI has focused its efforts on evaluating the efficacy of a restoration solution involving floating nurseries for the first time in Cyprus. As a first step, the necessary permits were obtained from the relevant Governmental Departments and regulators in Cyprus to initiate fieldwork and the respective actions. For the development of the two coral nurseries, the proposed methodology by Rinkevich, 2019 and adapted for the Cyprus case study (Pilot 4) was followed (Fig. 1). In addition, a mini temperature logger was installed on each nursery to record seawater temperature (SWT) fluctuations with a 30-min interval for the duration of the experiments.

In parallel and in collaboration with the Hellenic Centre for Marine Research – HCMR an ecological status assessment and monitoring scheme of the area’s coastal habitats was initiated. Through seasonal expeditions, the overall benthic community structure is evaluated in both soft- and hard-bottom habitats. 

Among the key findings is that hydrographic conditions play a crucial role in the survival of coral fragments, as one location exhibited the highest survival rate. The weather and hydrodynamic conditions of each area can also affect the installation and the overall progress of the experiment, and ongoing expeditions for inspection are advised. Hands-on adjustments were necessary on several occasions to maintain the nursery’s proper orientation and to fix any damage. Differences in benthic biodiversity and community structure across areas have also been observed. The next step will be to continue the monitoring program related also to the return of the fragments back into their natural habitats, which will conclude the last phase of this Pilot.

Reference:

Rinkevich, B. (2019) The active reef restoration toolbox is a vehicle for coral resilience and adaptation in a changing world», Journ. of Mar. Sci. Eng, 7(7), 201, https://doi.org/10.3390/jmse7070201 

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