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

TY - JOUR

T1 - Strain selection and temperature responses of Ulva and Ulvaria (Chlorophyta) for application in land-based cultivation systems

AU - Larsen-Ledet, Kristoffer

AU - Boderskov, Teis

AU - Olesen, Birgit

AU - Larsen, Martin Mørk

AU - Rimi Christiansen, Esben

AU - Nielsen, Lasse Hornbek

AU - De Clerck, Olivier

AU - Bruhn, Annette

PY - 2025/1

Y1 - 2025/1

N2 - 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 NO 3 −-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.

AB - 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 NO 3 −-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.

KW - Artsudvælgelse

KW - Bioremediering

KW - Fotosynteserater

KW - Kvælstofoptag

KW - Ulva-dyrkning

KW - makroalger

KW - Bioremediation

KW - Macroalgae

KW - Nitrogen uptake potential

KW - Photosynthesis rates

KW - Species selection

KW - Ulva cultivation

UR - http://www.scopus.com/inward/record.url?scp=85212535508&partnerID=8YFLogxK

U2 - 10.1016/j.algal.2024.103858

DO - 10.1016/j.algal.2024.103858

M3 - Journal article

SN - 2211-9264

VL - 85

JO - Algal Research

JF - Algal Research

M1 - 103858

ER -