Assessing the potential for sea-based macroalgae cultivation and its application for nutrient removal in the Baltic Sea

Kotta Jonne; Raudsepp Urmas; Szava-Kovats Robert; Aps Robert; Armoskaite Aurelija; Barda Ieva; Bergström Per; Futter Martyn; Gröndahl Fredrik; Hargrave Matthew; Jakubowska Magdalena; Jänes Holger; Kaasik Ants; Kraufvelin Patrik; Kovaltchouk Nikolai; Krost Peter; Kulikowski Tomasz; Kõivupuu Anneliis; Kotta Ilmar; Lees Liisi; Loite Sander; Maljutenko Ilja; Nylund Göran; Paalme Tiina; Pavia Henrik; Purina Ingrida; Rahikainen Moona; Sandow Verena; Visch Wouter; Yang Baoru; Barboza Francisco R.
Assessing the potential for sea-based macroalgae cultivation and its application for nutrient removal in the Baltic Sea

Kotta Jonne
Raudsepp Urmas
Szava-Kovats Robert
Aps Robert
Armoskaite Aurelija
Barda Ieva
Bergström Per
Futter Martyn
Gröndahl Fredrik
Hargrave Matthew
Jakubowska Magdalena
Jänes Holger
Kaasik Ants
Kraufvelin Patrik
Kovaltchouk Nikolai
Krost Peter
Kulikowski Tomasz
Kõivupuu Anneliis
Kotta Ilmar
Lees Liisi
Loite Sander
Maljutenko Ilja
Nylund Göran
Paalme Tiina
Pavia Henrik
Purina Ingrida
Rahikainen Moona
Sandow Verena
Visch Wouter
Yang Baoru
Barboza Francisco R.
Katso/Avaa
Lataukset: 

Elsevier B.V.
doi:10.1016/j.scitotenv.2022.156230
URI
https://doi.org/10.1016/j.scitotenv.2022.156230
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022081153710
Tiivistelmä

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.

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