Small-scale low-tropic ocean farming and coastal rural landscapes: Why the logistics of seaweed matter? Insights from Ireland for collaborative planning

Kelps are part of large brown macroalgae species with a fundamental role in temperate to subpolar coastal marine ecosystems and their cultivation has been expanding as part of several efforts and countries' policies. This study explores the relevance of post-harvesting logistics planning involving marine operations of emerging seaweed-based supply chains including kelp species. In the Irish context, we explore the potential of collaboration among low-tropic ocean farming sectors regarding shared space and infrastructure in rural and remote landscapes. Based on empirical data and a novel methodological approach, a multi-method analysis was performed involving geographic information systems, mathematical modelling and qualitative content analysis. The results indicate large potential production and collaboration capacity if current licensed areas and existing infrastructure were integrated with kelp cultivation for further processing and distribution in 40 local supply hubs and 14 optimal locations for shared processing facilities. Moreover, the different transportation scenarios considered indicate that costs and greenhouse gas emissions could be minimised by reducing moisture content locally and with increased payload. Further linkages reveal uncertainties in the uses of alternative methods of preservation such as ensiling and a lack of attention to non-market values. For future valorisation in diverse commercial and non-commercial applications, seaweed farming and collaborative processing opportunities still need to be incorporated into societal discourses and futures envisioned by rural coastal communities, including the engagement of young generations in such transformation pathways.