Differentiation of microbial communities in coastal seawater before and during an Akashiwo sanguinea (Dinophyceae) bloom in the urban area of Antofagasta city (northern Chile)

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dc.contributor.authorHu, Jingming
dc.contributor.authorCameron, Henry
dc.contributor.authorRilling, Joaquín I
dc.contributor.authorCampos, Marcos
dc.contributor.authorRuiz-Gil, Tay
dc.contributor.authorGonzalez, Mariela A
dc.contributor.authorGajardo, Gonzalo
dc.contributor.authorVergara, Karen
dc.contributor.authorGuzmán, Leonardo
dc.contributor.authorEspinoza-González, Oscar
dc.contributor.authorFuenzalida, Gonzalo
dc.contributor.authorRiquelme, Carlos
dc.contributor.authorUeki, Shoko
dc.contributor.authorNagai, Satoshi
dc.contributor.authorMaruyama, Fumito
dc.contributor.authorFujiyoshi, So
dc.contributor.authorYarimizu, Kyoko
dc.contributor.authorPerera, Ishara Uhanie
dc.contributor.authorÁvila Barrera, Andrés
dc.contributor.authorAcuña, Jacquelinne J
dc.contributor.authorZhang, Qian
dc.contributor.authorJorquera, Milko A
dc.date.accessioned2026-10-21T19:03:11Z
dc.date.available2026-10-21T19:03:11Z
dc.date.issued2025
dc.description.abstractHarmful algal blooms (HABs) are highly relevant for public health, the economy, the ecosystem, and biodiversity stability in southern Chile (40° to 53°S), where they occur regularly and are frequently monitored. However, HAB events and their associated microbes in northern Chile (17° to 30°S) remain unknown and difficult to track due to a lack of monitoring, particularly in urban areas. We investigated changes in microbial communities in coastal seawater before and during an Akashiwo sanguinea bloom (B) at two sampling points in Antofagasta city (23°38′39S, 70°24′39W). Seawater samples (filtered at 1 and 0.2 μm) were collected during distinct bloom phases (control, prebloom, and in-bloom), and 16S and 18S rDNA gene libraries were constructed and analyzed via the DNA metabarcoding technique. Our findings indicate that species diversity within the 16S rDNA-based community was greater during the prebloom phase than during the control and in-bloom phases. Conversely, species diversity within the 18S rDNA-based community was lower during the in-bloom phase than during the control and prebloom phases. Independent of the sampling points and fractions, principal coordinate analysis (PCoA) revealed distinct differences in both the 16S and 18S rDNA-based communities between the analyzed bloom phases. Our analysis further revealed that the 16S rDNA-based community was dominated by the Flavobacteriaceae and Rhodobacteraceae families, whose abundance decreased and increased, respectively, during the bloom. As anticipated, the structure of the 18S rDNA-based community was predominantly governed by the Gymnodiniaceae family, specifically the Akashiwo genus, during the bloom. The differentiation in microbial communities was more pronounced in taxa with low abundances than in the dominant taxa. Additionally, co-occurrence network analysis revealed predominantly positive relationships within the microbial communities, particularly during the bloom event. Our analysis also identified several bacterial genera as keystone taxa within the microbial communities, notably members of Pseudomonadota and Bacteroidota. © 2024 Elsevier B.V.
dc.description.sponsorshipScience and Technology Research Partnership for Sustainable Development (SATREPS) ; JICA and JST, Japan, code JPMJSA1705; the National Science Foundation of China (No. 42077386); the Natural Science Foundation of Fujian Province, China (Grant No. 2023J01042); Universidad de La Frontera (Temuco, Chile)
dc.identifier.doi10.1016/j.hal.2024.102782
dc.identifier.issn1568-9883
dc.identifier.urihttps://repositorioabierto.uantof.cl/handle/uantof/786
dc.language.isoen
dc.publisherElsevier
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1568988324002154?pes=vor&utm_source=scopus&getft_integrator=scopus
dc.rights©2024ElsevierB.V.Allrightsarereserved, includingthosefortextanddatamining
dc.sourceHarmful Algae
dc.subjectBacterioplankton
dc.subjectBacterial diversity
dc.subjectDinoflagellate
dc.subjectDNA metabarcoding
dc.subjectHolobiont
dc.subjectPhytoplankton
dc.titleDifferentiation of microbial communities in coastal seawater before and during an Akashiwo sanguinea (Dinophyceae) bloom in the urban area of Antofagasta city (northern Chile)
dc.typeArticle
oaire.citation.volume142
organization.identifier.rorhttps://ror.org/04eyc6d95
organization.legalNameUniversidad de Antofagasta
uantof.curation.reviewed2026-11-05
uantof.curation.reviewedByDiego León
uantof.identificator.centerCentro de Bioinnovación
uantof.identificator.facultyFacultad de Ciencias del Mar y Recursos Biológicos
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