Physiological Responses of Porphyra yezoensis Ueda (Bangiales, Rhodophyta) Exposed to High Ammonium Effluent in a Seaweed-based Integrated Aquaculture System

Kang, Yunhee; Park, Sang-Rul; Oak, Jung-Hyun; Seo, Tae-Ho; Shin, Jong-Ahm; Chung, Ik‐Kyo

doi:10.5657/fas.2009.12.1.070

Cited by 3 publications

(1 citation statement)

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“…By controlling the electron flux, seaweeds are able to Table 1 Summary of two-way ANOVA for the relative growth rate (elongation = RGL and organic content = AFDW tot ), photosynthetic responses (maximum electron transport rate = rETR max , the saturation irradiance = E k and the slope of the light-limited region of the light curve = α), chemical composition (total nitrogen content = Tot N, carbon to nitrogen ratio = C:N) and pigment content (chlorophyll a, total carotenoid content and fucoxanthin) manage the assimilation of nitrogen and its incorporation into organic compounds to limit the accumulation of extra metabolites such as reactive oxygen species, which may damage the cells. Such responses can be relatively fast, and for Pyropia (Porphyra) yezoensis, 24 h exposure to 70 μmol L −1 of ammonium are enough to stimulate an increase in electron transport rate and maximum quantum yield (Kang et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Kelp in IMTAs: small variations in inorganic nitrogen concentrations drive different physiological responses of Saccharina latissima

et al. 2020

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Kelps can be included in integrated multitrophic aquaculture (IMTA) where their growth and quality might benefit from the nutrient load released by other species like finfish and mussels transforming effluents from the cultured animals into valuable products. We studied how different nutrient concentrations affect growth, photosynthesis, chemical composition and pigment content of the kelp Saccharina latissima. We exposed kelps to natural seawater, water enriched to levels of ammonium and nitrate simulating finfish cage waste (IMTA1) and a combination of such enrichment with natural effluents coming from mussels (IMTA2). The algal biomass was higher and produced elevated total organic content when exposed to both IMTA1 and IMTA2. The photosynthetic responses in terms of relative electron transfer rate (rETRmax), PSII saturation irradiance (Ek) and total nitrogen content were also positively affected by both IMTA1 and IMTA2. We found a significant enhancement in pigment content only when algae were exposed to the strongest enrichment of our study (IMTA2). Finally, we found a positive relationship between rETRmax and growth, and the content of chlorophyll a and fucoxanthin. Our results show significant physiological responses of S. latissima to nutrient enrichment mimicking IMTA settings, as well as the benefit of added nutrients through a boost in photosynthetic activity that leads to higher kelp biomass and pigment production. This study suggests that modest nitrogen enrichment such as the one in our IMTA2 setup is enough to generate not only higher kelp biomass, but also an increased biomass quality with potentially higher market value.

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Section: Discussionmentioning

confidence: 99%