Chemistry
| Algal group | δ13C range |
|---|---|
| HCO3-using red algae | −22.5‰ to −9.6‰ |
| CO2-using red algae | −34.5‰ to −29.9‰ |
| Brown algae | −20.8‰ to −10.5‰ |
| Green algae | −20.3‰ to −8.8‰ |
Brown algae have a δ13C value in the range of −20.8‰ to −10.5‰, in contrast with red algae and greens. This reflects their different metabolic pathways.
They have cellulose walls with alginic acid and also contain the polysaccharide fucoidan in the amorphous sections of their cell walls. A few species (of Padina) calcify with aragonite needles.
Brown algae produce a specific type of tannin called phlorotannins.
Read more about this topic: Brown Algae
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