Strain selection and temperature responses of Ulva and Ulvaria (Chlorophyta) for application in land-based cultivation systems

Larsen-Ledet, K.; Boderskov, T.; Olesen, B.; Larsen, M.M.; Simonsen, N.; Christiansen, E.R.; Nielsen, L.H.; Tran, L.-A.T.; D'Hondt, S.; De Clerck, O.; Bruhn, A.

doi:/10.1016/j.algal.2024.103858

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Strain selection and temperature responses of Ulva and Ulvaria (Chlorophyta) for application in land-based cultivation systems

Larsen-Ledet, K.; Boderskov, T.; Olesen, B.; Larsen, M.M.; Simonsen, N.; Christiansen, E.R.; Nielsen, L.H.; Tran, L.-A.T.; D'Hondt, S.; De Clerck, O.; Bruhn, A. (2025). Strain selection and temperature responses of Ulva and Ulvaria (Chlorophyta) for application in land-based cultivation systems. Algal Research 85: 103858. https://dx.doi.org/10.1016/j.algal.2024.103858

In: Algal Research. Elsevier: Amsterdam. ISSN 2211-9264

Available in	Authors
VLIZ: Open access 411992 [ download pdf ]

Keywords

Bioremediation
Marine/Coastal

Author keywords

Ulva cultivation; Macroalgae, Photosynthesis rates; Nitrogen uptake potential; Species selection

Authors		Top
Larsen-Ledet, K. Boderskov, T. Olesen, B. Larsen, M.M.	Simonsen, N. Christiansen, E.R. Nielsen, L.H. Tran, L.-A.T.	D'Hondt, S. De Clerck, O., more Bruhn, A.

Abstract

The macroalgal family, Ulvaceae, holds promising candidates for cultivation in land-based Integrated Multitrophic Recirculated Aquaculture Systems (IMRAS) due to their fast growth and nutrient uptake capabilities. Selection of appropriate strains, however, is crucial before implementation in IMRAS. In this study, an evaluation of Ulvaceae strains was conducted through an initial screening of in total nine strains, eight sourced from natural habitats and one commercial Ulva producer. The abiotic conditions were characterised by high nutrient concentrations (883 μM NO₃⁻-N) and were kept uniform for all strains during the screening. Following the initial screening, the effect of temperature on growth was investigated (10, 16, 22, and 28 °C) in two selected strains (Ulva compressa and Ulvaria obscura) under high nutrient conditions. This study demonstrated that four investigated Ulvaceae strains achieved high and stable growth rates (15–22% fresh weight d⁻¹) in indoor free-floating cultures. Further, there was consistent and significant nitrogen uptake potential of a single Ulva compressa strain across temperatures between 10 and 22 °C (0.03 g N L⁻¹ Week⁻¹ corresponding to 74% of added dissolved inorganic nitrogen). Ulva compressa grew across all investigated temperatures with weekly variations in biomass yields (18–40 g dry weight m⁻² day⁻¹) while Ulvaria obscura grew stably at 10, 16, and 22 °C (15–16 g dry weight m⁻² day⁻¹). The findings of this study enhance our understanding of the potential uses of Ulvaceae strains in land-based cultivation and serves as a stepping stone for the integration of Ulvaceae cultivation into IMRAS on a commercial scale.

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