Cell wall organic matrix composition and biomineralization across reef-building coralline algae under global change

Ellie Bergström, Jelle Lahnstein, Helen Collins, Tessa Page, Vincent Bulone, Guillermo Diaz-Pulido

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Abstract

Crustose coralline algae (CCA) are one of the most important benthic substrate consolidators on coral reefs through their ability to deposit calcium carbonate on an organic matrix in their cell walls. Discrete polysaccharides have been recognized for their role in biomineralization, yet little is known about the carbohydrate composition of organic matrices across CCA taxa and whether they have the capacity to modulate their organic matrix constituents amidst environmental change, particularly the threats of ocean acidification (OA) and warming. We simulated elevated pCO2 and temperature (IPCC RCP 8.5) and subjected four mid-shelf Great Barrier Reef species of CCA to 2 months of experimentation. To assess the variability in surficial monosaccharide composition and biomineralization across species and treatments, we determined the monosaccharide composition of the polysaccharides present in the cell walls of surficial algal tissue and quantified calcification. Our results revealed dissimilarity among species' monosaccharide constituents, which suggests that organic matrices are composed of different polysaccharides across CCA taxa. We also observed that species differentially modulate composition in response to ocean acidification and warming. Our findings suggest that both variability in composition and ability to modulate monosaccharide abundance may play a crucial role in surficial biomineralization dynamics under the stress of OA and global warming.
Original languageEnglish
Article number13290
Number of pages15
JournalJOURNAL OF PHYCOLOGY
Early online date27 Oct 2022
DOIs
Publication statusE-pub ahead of print - 27 Oct 2022

Keywords

  • biomineralization
  • calcification
  • coral reefs
  • crustose coralline algae
  • global warming
  • monosaccharides
  • ocean acidification
  • organic matrix

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