Estonian Marine Institute, University of Tartu, Mäealuse 14, EE-12618 Tallinn, Estonia; Estonian Maritime Academy, Tallinn University of Technology, Kopli 101, EE-11712 Tallinn, Estonia.
Marine Systems Institute, Tallinn University of Technology, Ehitajate tee 5, EE-12616 Tallinn, Estonia.
Sci Total Environ. 2022 Sep 15;839:156230. doi: 10.1016/j.scitotenv.2022.156230. Epub 2022 May 26.
Marine eutrophication is a pervasive and growing threat to global sustainability. Macroalgal cultivation is a promising circular economy solution to achieve nutrient reduction and food security. However, the location of production hotspots is not well known. In this paper the production potential of macroalgae of high commercial value was predicted across the Baltic Sea region. In addition, the nutrient limitation within and adjacent to macroalgal farms was investigated to suggest optimal site-specific configuration of farms. The production potential of Saccharina latissima was largely driven by salinity and the highest production yields are expected in the westernmost Baltic Sea areas where salinity is >23. The direct and interactive effects of light availability, temperature, salinity and nutrient concentrations regulated the predicted changes in the production of Ulva intestinalis and Fucus vesiculosus. The western and southern Baltic Sea exhibited the highest farming potential for these species, with promising areas also in the eastern Baltic Sea. Macroalgal farming did not induce significant nutrient limitation. The expected spatial propagation of nutrient limitation caused by macroalgal farming was less than 100-250 m. Higher propagation distances were found in areas of low nutrient and low water exchange (e.g. offshore areas in the Baltic Proper) and smaller distances in areas of high nutrient and high water exchange (e.g. western Baltic Sea and Gulf of Riga). The generated maps provide the most sought-after input to support blue growth initiatives that foster the sustainable development of macroalgal cultivation and reduction of in situ nutrient loads in the Baltic Sea.
海洋富营养化是对全球可持续性的普遍和日益严重的威胁。大型藻类养殖是实现减少营养物质和保障粮食安全的有前途的循环经济解决方案。然而，其生产热点的位置尚不清楚。本文预测了高商业价值大型藻类在波罗的海地区的生产潜力。此外，还调查了大型藻类养殖场内外的营养限制情况，以建议特定地点养殖场的最佳配置。裙带菜的生产潜力主要受盐度驱动，在盐度大于 23 的波罗的海最西部地区预计会有最高的产量。光照、温度、盐度和营养浓度的直接和交互作用调节了肠浒苔和泡叶藻的产量的预测变化。这些物种在波罗的海西部和南部的养殖潜力最大，波罗的海东部也有很有前景的地区。大型藻类养殖不会导致明显的营养限制。由于大型藻类养殖而导致的预期的营养限制的空间传播距离小于 100-250 米。在营养和水交换低的区域（如波罗的海中部的近海地区）发现了更大的传播距离，而在营养和水交换高的区域（如波罗的海西部和里加湾）则发现了更小的传播距离。生成的地图提供了最受关注的输入，以支持蓝色增长倡议，促进大型藻类养殖的可持续发展，并减少波罗的海的原位营养负荷。
