Microbial communities in coastal seawater during Heterosigma akashiwo and Alexandrium catenella blooms in Chilean Patagonian fjords.
Zhou Y, González CA, Manquian J, Vergara K, Gajardo G
Harmful Algal Blooms
Shellfish from Chilean fjords — mussels, clams, oysters — become toxic during these algal blooms, and understanding which bacteria help blooms thrive is the first step toward early-warning systems that protect coastal food supplies.
Harmful algal blooms — the kind that shut down shellfish harvests and poison marine life — don't happen alone. This study found that two different types of these blooms each travel with their own distinct crowd of bacteria and tiny organisms, like a biological fingerprint. Identifying those signature microbes could eventually help scientists predict blooms before they become dangerous.
Key Findings
The two bloom types (Heterosigma akashiwo and Alexandrium catenella) harbored significantly different microbial communities in both richness and taxonomic structure.
Proteobacteria, Bacteroidota, and Cyanobacteria dominated the bacterial communities across both bloom types and both water-size fractions sampled (1 µm and 0.2 µm filters).
Blastopirellula bacteria and Dino-Group-I-Clade-1 dinoflagellates were identified as keystone taxa specifically in the Alexandrium catenella bloom, suggesting outsized roles in structuring that community.
chevron_right Technical Summary
Scientists studying harmful algal blooms in Chilean Patagonia discovered that each bloom type hosts a distinctly different community of bacteria and microorganisms, and identified specific microbial 'keystone' species that may drive or sustain toxic blooms.
Abstract Preview
Harmful algal blooms (HABs) are recurring events in Chilean coasts where free-living and associated microbiota (also known as HAB holobiont) may play a crucial role for occurrence, monitoring and p...
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