Variation in germling growth in the green tide–forming alga Ulva intestinalis (Chlorophyta) in response to gradients in salinity, temperature, light, and nutrients

Kim, Ju-Hyoung; Zhao, Zi Xu; Kim, Young Sik

doi:10.1007/s10811-021-02563-4

Cited by 9 publications

(2 citation statements)

References 47 publications

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“…Despite the rapid growth of the tubular species it should be mentioned that at 30 PSU the germlings of the NE-Atlantic strain of U. lacinulata had a similar growth rate to the ones of the tubular species therefore being a good candidate as well. Consistent with our results, another study has shown that temperature and light proved to be more important factors than salinity (and even nutrients) to promote growth in germlings of the tubular species U. intestinalis (Kim et al 2021). In our work, both temperature and light were assumed to be optimal.…”

Section: Discussionsupporting

confidence: 92%

“…In contrast, foliose Ulva species are mostly present in areas with salinities ranging from 18 to 40 PSU (Rybak 2018). Similarly as reported here, optimum salinity for growth and photosynthetic activity ranged between 20 and 35 PSU for foliose species and between 10 and 32 PSU for tubular species in other laboratory studies (Choi et al 2010;Chen and Zou 2015;Xiao et al 2016;Li et al 2017;Bastos et al 2019;Bews et al 2021;Kim et al 2021).…”

Section: Discussionsupporting

confidence: 85%

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Salinity as a tool for strain selection in recirculating land-based production of Ulva spp. from germlings to adults

Cardoso,

Meiβner,

Sawicki

et al. 2023

J Appl Phycol

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The genus Ulva is globally distributed and has been thoroughly studied because of its functional biochemical composition, rapid growth rates and opportunistic features, and interest in Ulva cultivation is growing worldwide. In Europe, mostly near- and on-shore flow-through cultivation systems are used and land-based recirculating aquaculture systems (RAS) using fresh water or artificial seawater have not been developed for Ulva. While RAS provides quality control and can be located inland, maintenance costs are high. Using selected strains adapted to low-salinity could reduce seawater production costs and improve the economic feasibility. Therefore, our study assessed how salinity can be used as a tool for strain selection and optimization of functional traits. Growth rates and antioxidant activity of three species (four strains) of tubular and foliose Ulva from the NE-Atlantic and Mediterranean (foliose: Ulva lacinulata – two geographical strains, tubular: Ulva linza and Ulva flexuosa) were followed for three weeks at salinities ranging from 10 to 30 PSU. The tubular strains achieved optimal growth at a lower salinity than U. lacinulata. However, growth rates of both foliose strains were higher than of tubular strains, even at sub-optimal salinity. Therefore, U. lacinulata is a good candidate for RAS with artificial seawater, and the cost of salt can be reduced by up to 33.3% (20 PSU) without significantly reducing the growth rate of U. lacinulata. Higher antioxidant activity was achieved by reducing the salinity to 10 PSU for 10 days, suggesting that the functional traits of cultivated Ulva lacinulata can be optimized prior to harvest.

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Section: Discussionsupporting

confidence: 92%