Decreased Irradiance and Nutrient Enrichment Mitigate the Negative Effect of Ocean Warming on Growth and Biochemical Compositions of a Canopy-Forming Marine Macroalga

Heatwaves under global warming have negative impacts on ecosystem primary producers. This warming effect may be synergized or antagonized by local environments such as light and nutrient availability. However, little is known about the interactive effects of warming, irradiance, and nutrients on phy...

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Published inJournal of marine science and engineering Vol. 10; no. 4; p. 479
Main Authors Charan, Harshna, Inomata, Eri, Endo, Hikaru, Sato, Yoichi, Okumura, Yutaka, Aoki, Masakazu N.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 30.03.2022
Subjects
Algae
Canopies
Canopy
Carbon
Carbon content
carbon sequestration
Chlorophyll
Chlorophylls
Climate change
Coastal ecosystems
Composition
ecosystem conservation
Enrichment
Environmental impact
Global warming
Growth rate
Heatwaves
Irradiance
Laboratories
Light
Marine ecosystems
marine macroalgal forest
Mineral nutrients
Nitrogen
non-additive effect
Nutrient availability
Nutrient content
Nutrient enrichment
Nutrients
Ocean temperature
Ocean warming
Pigments
Plant cover
Salinity
Seawater
Seaweeds
Temperature effects
Japan
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Summary:Heatwaves under global warming have negative impacts on ecosystem primary producers. This warming effect may be synergized or antagonized by local environments such as light and nutrient availability. However, little is known about the interactive effects of warming, irradiance, and nutrients on physiology of marine macroalgae, which are dominant in coastal ecosystems. The present study examined the combined effects of warming (23 and 26 °C), irradiance (30 and 150 µmol photon m−2 s−1), and nutrients (enriched and non-enriched) on specific growth rate (SGR) and biochemical compositions of the canopy-forming marine macroalga Sargassum fusiforme. The negative effect of warming on SGR and ratio of chlorophyll (Chl) c to Chl a was antagonized by decreased irradiance. Moreover, the negative effect of temperature elevation on carbon content was antagonized by nutrient enrichment. These results suggest that the effect of warming on the growth and carbon accumulation of this species can be mitigated by decreased irradiance and nutrient enrichment.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10040479