Tidal levels significantly change bacterial community composition in a tropical estuary during the dry season

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dc.contributor.authorAguilar, Pablo
dc.contributor.authorPiyapong, Chantima
dc.contributor.authorChamroensaksri, Nitcha
dc.contributor.authorJintasaeranee, Pachoenchoke
dc.contributor.authorSommaruga, Ruben
dc.date.accessioned2026-10-21T19:03:00Z
dc.date.available2026-10-21T19:03:00Z
dc.date.issued2025
dc.description.abstractEstuaries are usually characterized by strong spatial and temporal variability in water physicochemical conditions and are often largely affected by human activities. One important source of variability is caused by tides that can swiftly alter not only physicochemical conditions but also the abundance and composition of the biota. The effect of the diurnal tidal cycle on microbial community composition during different seasons remains uncertain, although this knowledge underlies having effective monitoring programs for water quality and potential identification of health risk conditions. In this study, we assessed the bacterioplankton community composition and diversity across four tidal water levels in a tropical estuary characterized by a mixed semidiurnal tide regime (i.e., two high and two low tides of varying amplitudes) during both dry and wet seasons. The bacterial community composition varied significantly among the four tidal levels, but only during the dry season, when the influence of the seawater intrusion was largest. Bacterial indicators’ taxa identified using the Indicator Value Index were found within Cyanobacteria, Actinobacteriota, Bacteroidota, and Proteobacteria. The indicator taxon Cyanobium sp. had a prominent presence across multiple tidal levels. The main predicted phenotypes of the bacterial communities were associated with potential pathogenicity, gram-negative, and biofilm formation traits. While there were no marked predicted phenotypic differences between seasons, pathogenic and gram-negative traits were more prevalent in the dry season, while biofilm formation traits dominated in the wet season. Overall, our findings underscore the intricate relationship between river hydrodynamics and bacterial composition variability and hint a significant human impact on the water quality of the Bangpakong River
dc.description.sponsorshipBurapha University, the National Research Council of Thailand (Grant number: 53/2562); ANID Millennium Science Initiative Program NCN2021-056; the Austrian Agency for International Cooperation in Education and Research through the ASEA-UNINET Program (MPC-2022-04066)
dc.identifier.doi10.1007/s42995-024-00254-w
dc.identifier.issn2096-6490
dc.identifier.urihttps://repositorioabierto.uantof.cl/handle/uantof/785
dc.language.isoen
dc.publisherSpringer Nature
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceMarine Life Science & Technology
dc.subjectBacterial indicators
dc.subjectBrackish systems
dc.subjectRivers
dc.subjectTides
dc.subjectWater pollution
dc.titleTidal levels significantly change bacterial community composition in a tropical estuary during the dry season
dc.typeArticle
oaire.citation.volume7
oaire.citationEndPage156
oaire.citationIssue1
oaire.citationStartPage144
organization.identifier.rorhttps://ror.org/04eyc6d95
organization.legalNameUniversidad de Antofagasta
uantof.curation.reviewed2026-11-05
uantof.curation.reviewedByDiego León
uantof.identificator.departmentDepartamento de Biotecnología
uantof.identificator.facultyFacultad de Ciencias del Mar y Recursos Biológicos
uantof.identificator.instituteInstituto Antofagasta
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