The fan mussel, Pinna nobilis, represents the largest bivalve endemic to the Mediterranean Sea. Since 2016, dramatic mass mortality of this species has been observed in several areas. The first surveys suggested that Haplosporidium pinnae (currently considered species-specific) was the main etiological agent, but recent studies have indicated that a multifactorial disease may be responsible for this phenomenon. In this study, we performed molecular diagnostic analyses on P. nobilis, P. rudis, and bivalve heterologous host species from the island of Sardinia to shed further light on the pathogens involved in the mass mortality. The results support the occurrence of a multifactorial disease and that Mycobacterium spp. and H. pinnae are not necessarily associated with the illness. Indeed, our analyses revealed that H. pinnae is not species-specific for P. nobilis, as it was present in other bivalves at least three years before the mass mortality began, and species of Mycobacterium were also found in healthy individuals of P. nobilis and P. rudis. We also detected the species Rhodococcus erythropolis, representing the first report in fan mussels of a bacterium other than Mycobacterium spp. and Vibrio spp. These results depict a complicated scenario, further demonstrating how the P. nobilis mass mortality event is far from being fully understood.

Ecosystem Services (ESs) are assuming a constantly increasing importance in management practices due to their key role in ensuring a sustainable future to fauna and flora on Earth. In addition, ES degradation and quality loss jeopardize current human activities. For this reason, it is essential to develop methodologies and practices able to efficiently assess environmental and socio-economic impacts in terms of ES deterioration, especially within protected areas. Norms and regulations have to be able to identify habitat and species categories to be preserved, and to determine the cost of their destruction and decline, according to a holistic vision, which includes social and economic impacts, besides the environmental ones. The paper illustrates the case study of the “Isola dell’Asinara” Marine Protected Area (MPA) in Sardinia, where an experimental methodology was developed with the aim to draw new regulations that integrate conservation measures of Natura 2000 sites included in its territory, provisions determined by the integrated coastal zone management (ICZM) protocol and the Standardized Actions for Effective Management of MPAs (ISEA) project. Subsequently, in order to assess the status of ESs and impacts on ESs located within the MPA territory, an ecosystem-based approach was implemented and applied to the actions defined for the new regulation proposal. Results show that regulations are in this way valuably enriched by environmental aspects of the MPA that would otherwise be overlooked.

This study outlines small-scale fishing Sardinia through specificities related to the state of the fishing fleet at the major and minor port systems of the island, the main techniques, and tools (fixed longlines, bottom trawls, purse seines, casting nets, driftnets). Mapping fishing areas in the Marine Protected Area of Asinara Island was important to define efficient fisheries management measures shared by stakeholders. Therefore, the work focused on the mapping of fishing areas in MPA, its techniques and tools.This work is a premise for future and more applicative lines of research

The European Charter for Sustainable Tourism (ECST) represents a voluntary management tool for protected areas that promotes the implementation of sustainable tourism for both the environment and local communities, as well as for all the stakeholders (e.g., firms, tourists); its principles emerge as an essential guide for designing policies respecting the environment and actively involving the local community. The present work focuses on the Asinara National Park (Porto Torres, Sardinia-Italy) as a case study of the ongoing application of the ECST (i.e., renewal phase of Phase I and initiation of Phase II). The aims were: (1) to identify the strengths and weaknesses related to confirming Phase I; (2) to isolate the motivations leading a firm to obtain the ECST certificate. Through a methodology involving official documentation analysis and the Park’s entrepreneurial landscape, results suggested a systemic vision of stakeholder engagement in creating a model for best practices to qualify the socio-economic network. Promoting participatory and inclusive governance could ensure a balance between sustainable tourism and environmental conservation on the Asinara island.

Understanding how land use and land cover changes (LULCCs) affect ecosystem services (ES) is essential for guiding sustainable management strategies in protected areas (PAs), particularly in small island contexts where ecological processes, historical land uses and socio-economic dynamics are tightly interwoven. This study explores the medium-term dynamics of ES supply using LULCCs as a spatial indicator on the island of Asinara (Italy). Spatially modelled results show that the transition from agricultural and semi-natural uses to uncultivated areas, driven by land abandonment and soft nature-restoration actions, has reshaped the balance between provisioning, regulating and cultural services, generating reflections on opportunities and land management challenges. These outcomes require careful contextualization to reflect underlying ecological processes and land capabilities, highlighting the need for governance frameworks oriented towards conservation-driven landscape management rather than passive rewilding, especially in landscapes long shaped by human activities. More generally, sustainability in PAs is not an automatic outcome of protection or abandonment, but a contingent, spatially differentiated and governed process, in which indicators and maps serve to guide decisions, not to certify their success.