Do rhodophyta produce saxitoxin

Yes, certain species of Rhodophyta, commonly known as red algae, can produce saxitoxin, a potent neurotoxin. This is particularly observed in specific red algal species that can accumulate toxins from their environment, especially in areas affected by harmful algal blooms. Saxitoxin is primarily associated with the dinoflagellates responsible for red tides, but some red algae can also play a role in the transfer of these toxins through the food web.