acidification
The ecological threshold of the Atlantic marine system
The expansion of Marine Protected Areas (MPAs) in Spain, with the aim of protecting 22,405 km² of waters in the eastern North Atlantic basin around the Canary Islands, is not simply a conservation measure: it represents an intervention aimed at the buffering capacity of the marine biological system. The central quantifiable data — 22,405 km² — corresponds to approximately 18% of the entire surface area of Spanish waters, and is concentrated in an area with high endemism: according to scientific sources, the Macaronesia basin is home to 16 species of endemic algae and over 790 native fish. This level of biodiversity is a direct indicator of the system’s resilience to physical disturbances such as ocean acidification and thermal overheating.
The critical threshold is not only the amount protected, but also the degree of functional integration between the areas. Sources indicate that 52% of the dry forests in the Canary archipelago are already under formal protection, but less than 30% benefit from effective active management. The new proposal aims to bridge this operational gap between designation and actual implementation. Exceeding the critical threshold for buffering capacity occurs when the protected area is not only geographically delimited, but also functionally integrated into the regional ecological flow.
The hydroclimatic pressure as an accelerator of resilience
The intervention is set within a context of reduced evaporative capacity in coastal water systems. In Lake Trasimeno, the level has dropped to -191 cm compared to the hydrological zero — a condition that threatens the stability of the regional microclimate and agricultural productivity. This reduction is not isolated: in Italy, over 60% of agricultural areas are affected by critical drought, while the Danube and Rhine rivers have reached historically low levels. The hydroclimatic pressure translates into a reduced evaporative capacity of the Earth’s system, which in turn affects the local energy balance.
Marine protection therefore becomes a compensation mechanism: protected ecosystems in the Atlantic basin can absorb a greater amount of surface heat thanks to the biodiversity of phytoplankton and zooplankton communities. This increase in thermal buffer capacity is crucial for mitigating the effects of ocean warming, which in other areas has already caused the collapse of fish populations. The anthropogenic pressure is not limited to fishing: the expansion of shipping routes and the presence of offshore facilities increase the risk of chemical contamination, which further reduces the resilience of the system.
The Strategic Leverage of Endemic Biodiversity
The effectiveness of Marine Protected Areas (MPAs) depends not only on the protected area’s surface, but also on the degree of functional integration with existing ecosystem services. Endemic species of the Canary Basin — such as the Canary moonfish (Scomberomorus cavalla) or the black cuttlefish (Sepia officinalis) — are direct indicators of trophic stability. Their presence is linked to specific hydrothermal and chemical conditions, which only persist in areas with low anthropogenic disturbance.
Protecting the most vulnerable areas — such as those around Mount Teide or in the underwater canyons of La Gomera — allows for the conservation of gene flow between isolated populations. This is crucial for maintaining evolutionary adaptability in a context of accelerated climate change. The intervention does not only concern the present, but also the long-term adaptation prospects: a population with high genetic diversity has a higher potential to respond to environmental variations.
The Operational Window and the Measure of Success
The effectiveness of the strategy depends on the ability to monitor the return of key ecosystem services. The critical data to follow is not only the extent of protected areas, but also the rate of recovery of fish biomass in previously overexploited zones. According to studies conducted in the northern Mediterranean, the repopulation of sardine (Sardina pilchardus) required a minimum of 7 years after the establishment of actively managed marine protected areas.
The infrastructural cost is not only financial: it includes the loss of economic opportunities related to commercial fishing and mineral exploration. However, the systemic benefit—an increase in the thermal and chemical buffering capacity of the marine system—outweighs the operational costs when measured on a decennial timescale. The true indicator of success is not the amount of km² protected, but the biological resilience index (IBI) of fish communities in the Canary Basin by 4035.
Photo by Yohan Marion on Unsplash
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