The first years after protection: what changes beneath the Mediterranean seafloor?
Published in Ecology & Evolution and Zoology & Veterinary Science
Fishery No-Take Zones (FNTZs) are increasingly being introduced as a management tool to reduce pressure on marine ecosystems and support the sustainable use of fisheries resources. Yet assessing whether these measures are delivering ecological benefits can be challenging, particularly in deep soft-sediment habitats where changes may unfold over long timescales. A new article published in Reviews in Fish Biology and Fisheries examines the early ecological responses observed in eleven recently established FNTZs along the Catalan margin in the northwestern Mediterranean.
The research team surveyed bentho-demersal communities between 2023 and 2024 using remotely operated vehicle (ROV) video transects. Protected areas were compared with adjacent sites that remained open to fishing across two depth ranges: 100–300 m and deeper than 300 m. The study focused separately on sessile fauna, such as habitat-forming organisms attached to the seabed, and motile fauna, whose greater mobility may influence how quickly they respond to protection.
The results suggest that protection is already associated with ecological differences in some locations. Several no-take zones, particularly on the shelf edge, supported higher densities, richness and diversity of sessile organisms than nearby control areas. Community composition also differed, with protected zones tending to host a greater representation of habitat-forming species. These organisms can play an important role in increasing habitat complexity and supporting biodiversity.
Responses among motile fauna were less consistent. While some differences between protected and non-protected areas were observed, patterns varied among locations and depths. This contrast highlights an important point for marine managers and researchers: the effects of protection may depend not only on the duration of protection but also on the life histories of the organisms being studied and the environmental characteristics of the habitat.
The study also provides a reminder that recovery in deep-sea soft-sediment environments is unlikely to be rapid. The authors suggest that decades of bottom trawling have left a legacy of physical habitat degradation that may constrain ecological restoration, even after fishing pressure is removed. As a result, signs of recovery are currently uneven across the region and should be interpreted as the beginning of a longer process rather than evidence of full ecosystem restoration.
Beyond its ecological findings, the work establishes an important baseline for future monitoring of Mediterranean FNTZs. By providing a regional-scale assessment shortly after protection was implemented, it offers a reference point against which future changes can be measured. Long-term monitoring will be essential for understanding whether the patterns observed today develop into broader and more persistent ecosystem recovery in the years ahead.
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Sustaining Life Below Water: Conserving, managing, and protecting our marine and freshwater resources
In support of the UN Sustainable Development Goal SDG14 we are calling for submissions for this new collection on Sustaining Life Below WaterPlastic waste, overfishing, ocean acidification, increasing eutrophication are some of the major threats endangering our oceans, rivers and lakes. With this collection we aim to create a cross-disciplinary home for research articles, perspectives, and emerging topics addressing the conservation and sustainability of the use of our marine and freshwater resources. By putting scholarship supporting this UN Goal in the spotlight we hope to increase the scientific knowledge and awareness of the targets and indicators set by the UN Goal such as reducing marine pollution, strengthening resilience, restoring coastal ecosystems, minimizing the impacts of ocean acidification, reducing destructive fishing practices, providing access for small-scale fishers to marine resources and markets and more.
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