Dumontiae and other rhodophytes
have been confirmed in vivo and in vitro to inhibit growth of several viruses, notably herpes simplex I and II, and HIV.
Diatoms were the most abundant and diverse algal organisms (359 taxa), followed by chlorophytes (121), Cyanobacteria (42), euglenophytes (31), xanthophytes (14), chrysophytes (12), rhodophytes
(6), dinophytes (6), and cryptophytes (3).
This is what happens in the rhodophytes
and cyanobacteria, which use the nitrogen of their phycobilin pigments for cell growth if there are no external sources of nitrogen compounds.
This is with the addition of eight chlorophytes, one chrysophyte (a macroscopic tubicolus diatom species), two phaeophytes and five rhodophytes
Finally, the expressed morphologies of two common rhodophytes
found in all microhabitats, Chondracanthus spinosus (Kutzing) and Pterocla-diella capillacea (Gmelin), are explored and the fitness benefits associated with the observed morphology considered.
On the coasts of Brittany and Monterey, the upper circumlittoral consists of mixed populations of corallinaceous algae (Mesophyllum, Lithothamnium, Lithophyllum), laminar rhodophytes
(Rhodymenia, Fryeella, Phycodrys), and suspensivorous animals (sponges like Axinella, alcyonarians like Alcyonium, or Paralcyonium), but they do not form communities as complex as those in the Mediterranean.
Consequences of light limitation for carbon acquisition in three rhodophytes
262 A typical mediolittoral zonation pattern in the northwestern Mediterranean consists of an upper layer consisting of barnacles (Chthamalus), an intermediate level of the laminar rhodophytes
(Rissoella verruculosa), and a lower level with mussels (Mytilus galloprovincialis) and some coralline algae (Corallina elongata).