That coral reefs are in decline worldwide, particularly in the Caribbean, will come as no surprise. This decades-long decline has reached a potential tipping point as the weight of the effects of climate change have come decidedly to bear on the planet’s most diverse marine ecosystem. Whether coral reefs can persist without restorative intervention is debatable, which has prompted a surge in coral reef restoration projects focusing primarily on the cultivation and transplantation of coral fragments onto degraded reefs. But that widespread approach does little to address the underlying causes of coral loss, one of which is the proliferation of macroalgae that are deleterious to corals. An emerging solution to this problem is the enhancement of herbivory on coral reefs through improved management of herbivores, artificial enhancement of herbivore settlement, or their mariculture and subsequent stocking. This review explores the nuances of the biology of well-studied Caribbean coral reef herbivores (fishes, sea urchins, and crabs) as it relates to their mariculture and investigates the promise of herbivore stocking onto coral reefs as a restoration strategy.
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The EU Maritime Spatial Planning Directive (MSPD) requires the member states (MS) to pursue Blue Growth while ensuring good environmental status (GES) of sea areas. An ecosystem-based approach (EBA) should be used for the integration of the aims. However, the MSPD does not specify how the MS should arrange their MSP governance, which has led to a variety of governance arrangements and solutions in addressing the aims. We analysed the implementation of the MSPD in Finland, to identify conditions that may enable or constrain the integration of Blue Growth and GES in the framework of EBA. MSP in Finland is an expert-driven regionalized approach with a legally non-binding status. The results suggest that this MSP framework supports the implementation of EBA in MSP. Yet, unpredictability induced by the non-binding status of MSP, ambiguity of the aims of MSP and of the concept of EBA, and the need to pursue economic viability in the coastal municipalities may threaten the consistency of MSP in both spatial and temporal terms. Developing MSP towards a future-oriented adaptive and collaborative approach striving for social learning could improve the legitimacy of MSP and its capacity to combine Blue Growth and GES. The analysis indicates, that in the delivery of successful MSP adhering to the principles of EBA should permeate all levels of governance. The study turns attention to the legal status of MSP as a binding or non-binding planning instrument and the role the legal status plays in facilitating or constraining predictability and adaptability required in MSP.
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