Mediterranean Biodiversity Hotspots: Patterns, Trends, and Conservation Challenges

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Marine Diversity".

Deadline for manuscript submissions: 31 October 2026 | Viewed by 773

Special Issue Editors


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Guest Editor
Independent Researcher, Via Dottor Consoli 57, 95124 Catania, Italy
Interests: marine ecology; marine biology; marine botany; restoration ecology; biodiversity; conservation

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Guest Editor
Department of Biological, Geological and Environmental Sciences, University of Catania, Via Empedocle 58, 95128 Catania, Italy
Interests: marine macroalgae; taxonomy; mediterranean sea

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Guest Editor
1. Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STeBiCeF), University of Palermo, Via Archirafi 38, 90123 Palermo, Italy
2. NBFC, National Biodiversity Future Center-Palermo, Piazza Marina 61, 90133 Palermo, Italy
Interests: mediterranean marine algae; marine protected areas; biological invasions; citizen science
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Special Issue Information

Dear Colleagues,

The Mediterranean Basin is recognized as one of the most significant Global Biodiversity Hotspots (GBH), hosting a vast array of endemic marine fauna and flora. Despite its ecological importance, this basin is exceptionally susceptible to anthropogenic impacts. Key drivers threatening this rich biodiversity include climate warming, the introduction and spread of invasive alien species, habitat destruction, pollution, and eutrophication.

In this context, it is imperative to assess the conservation status of threatened species and propose effective management, conservation, and restoration strategies to ensure their long-term persistence. Evaluating these statuses requires not only the collection of contemporary data, but also a rigorous comparison with historical records to identify and interpret long-term trends and ecological patterns.

Marine Protected Areas (MPAs), particularly No-Take Zones (NTZs), are internationally recognized as essential tools for biodiversity conservation. By minimizing human interference, MPAs provide a sanctuary for endemic and endangered species. Furthermore, these areas can function as refugia, facilitating species repopulation and habitat recovery in surrounding regions.

This Special Issue aims to expand our understanding of Mediterranean marine biodiversity by investigating species and habitat patterns, identifying primary stressors, and addressing the challenges of effective conservation and restoration. We also welcome contributions that explore the pivotal role of MPAs in safeguarding Mediterranean ecosystems.

Dr. Giuliana Marletta
Dr. Donatella Serio
Dr. Anna Maria Mannino
Guest Editors

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Keywords

  • marine mediterranean biodiversity
  • conservation and restoration
  • marine protected areas (MPAs)
  • endemic species
  • anthropogenic impacts

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Published Papers (1 paper)

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Research

14 pages, 1155 KB  
Article
Impacts of Invasive Rabbitfish Species on Native Herbivore Communities in Eastern Aegean Coastal Ecosystems
by Ryan Wong, Tim Grandjean, Scott Bergisch, Maria Morán-García, Rumeysa Arslan, Anastasia Miliou, Rupert Perkins and Laura Macrina
Diversity 2026, 18(4), 225; https://doi.org/10.3390/d18040225 - 14 Apr 2026
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Abstract
The Mediterranean Sea is a major biodiversity hotspot increasingly affected by biological invasions, climate warming, and habitat degradation. Among the most successful invaders are the rabbitfish species Siganus luridus and Siganus rivulatus, Lessepsian migrants from the Red Sea that are now widespread [...] Read more.
The Mediterranean Sea is a major biodiversity hotspot increasingly affected by biological invasions, climate warming, and habitat degradation. Among the most successful invaders are the rabbitfish species Siganus luridus and Siganus rivulatus, Lessepsian migrants from the Red Sea that are now widespread across the eastern Mediterranean. This study examined how these invasive herbivores influence native herbivore assemblages in shallow coastal habitats around Lipsi Island in the Aegean Sea, Greece. Using Underwater Visual Census (UVC) surveys and in situ feeding observations, we quantified the abundance and grazing activity of invasive rabbitfish relative to that of the native herbivores Sparisoma cretense and Sarpa salpa. Invasive rabbitfish represented approximately 35% of the herbivore assemblages and showed clear habitat and dietary preferences. Significant negative correlations were observed between invasive foraging activity and the feeding rate of the native S. cretense, while no such effect was found for S. salpa. High habitat overlap between S. luridus and S. cretense suggests that this native species may be more susceptible to competition on rocky substrates. Evidence of partial resource partitioning was observed, including increased use of seagrass habitats by S. salpa. These findings highlight how invasive herbivores can restructure native herbivore communities and alter grazing dynamics in eastern Aegean coastal ecosystems. Given the ongoing sea warming and widespread decline of seagrass habitats across the Mediterranean, understanding these competitive interactions is therefore essential for assessing future biodiversity trajectories and informing management strategies. Full article
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