Effects of irradiance, temperature, nutrients, and pCO2 on the growth and biochemical composition of cultivated Ulva fenestrata
Artikel i vetenskaplig tidskrift, 2020

Ulva fenestrata is an economically and ecologically important green algal species with a large potential in seaweed aquaculture due to its high productivity, wide environmental tolerance, as well as interesting functional and nutritional properties. Here, we performed a series of manipulative cultivation experiments in order to investigate the effects of irradiance (50, 100, and 160 μmol photons m−2 s−1), temperature (13 and 18 °C), nitrate (< 5, 150, and 500 μM), phosphate (< 1 and 50 μM), and pCO2 (200, 400, and 2500 ppm) on the relative growth rate and biochemical composition (fatty acid, protein, phenolic, ash, and biochar content) in indoor tank cultivation of Swedish U. fenestrata. High irradiance and low temperature were optimal for the growth of this northern hemisphere U. fenestrata strain, but addition of nutrients or changes in pCO2 levels were not necessary to increase growth. Low irradiance resulted in the highest fatty acid, protein, and phenolic content, while low temperature had a negative effect on the fatty acid content but a positive effect on the protein content. Addition of nutrients (especially nitrate) increased the fatty acid, protein, and phenolic content. High nitrate levels decreased the total ash content of the seaweeds. The char content of the seaweeds did not change in response to any of the manipulated factors, and the only significant effect of changes in pCO2 was a negative relationship with phenolic content. We conclude that the optimal cultivation conditions for Swedish U. fenestrata are dependent on the desired biomass traits (biomass yield or biochemical composition).

Chlorophyceae

Relative growth rate

Biochemical composition

Macroalgae

Ulva lactuca

Aquaculture

Ulva fenestrata

Författare

Gunilla B. Toth

Göteborgs universitet

Hanna Harrysson

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Niklas Wahlström

Kungliga Tekniska Högskolan (KTH)

Joakim Olsson

Chalmers, Biologi och bioteknik, Industriell bioteknik

Annelous Oerbekke

Göteborgs universitet

Sophie Steinhagen

Göteborgs universitet

Alexandra Kinnby

Göteborgs universitet

Joel White

Göteborgs universitet

Eva Albers

Chalmers, Biologi och bioteknik, Industriell bioteknik

Ulrica Edlund

Kungliga Tekniska Högskolan (KTH)

Ingrid Undeland

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Henrik Pavia

Göteborgs universitet

Journal of Applied Phycology

0921-8971 (ISSN) 1573-5176 (eISSN)

Vol. 32 5 3243-3254

Produktionssystem för alger med högvärdiga tillämpningar

Stiftelsen för Strategisk forskning (SSF), 2015-01-01 -- 2019-12-31.

Ämneskategorier

Ekologi

DOI

10.1007/s10811-020-02155-8

Mer information

Senast uppdaterat

2020-11-10