Artículo
Microbial assemblages associated with the invasive kelp Undaria pinnatifida in Patagonian coastal waters: Structure and alginolytic potential
Lozada, Mariana
; Zabala, Maria Soledad
; Garcia, Patricia Elizabeth
; Dieguez, Maria del Carmen
; Bigatti, Gregorio
; Fermani, Paulina
; Unrein, Fernando
; Dionisi, Hebe Monica
Fecha de publicación:
07/2022
Editorial:
Elsevier
Revista:
Science of the Total Environment
ISSN:
0048-9697
e-ISSN:
1879-1026
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Undaria pinnatifida is a brown algae native to Asia that has settled in various regions worldwide, periodically contributing with large quantities of C and nutrients during its annual cycle. In this work, we analyzed a coastal site in Patagonia (Argentina) that has been colonized for three decades by U. pinnatifida, focusing on associated microbial communities in three different compartments. An important influence of algae was observed in seawater, especially in the bottom of the algal forest during the austral summer (January) at the moment of greater biomass release. This was evidenced by changes in DOC concentration and its quality indicators (higher Freshness and lower Humification index) and higher DIC. Although maximum values of NH4 and PO4 were observed in January, bottom water samples had lower concentrations than surface water, suggesting nutrient consumption by bacteria during algal DOM release. Concomitantly, bacterial abundance peaked, reaching 4.68 ± 1.33 × 105 cells mL −1 (January), showing also higher capability of degrading alginate, a major component of brown algae cell walls. Microbial community structure was influenced by sampling date, season, sampling zone (surface or bottom), and environmental factors (temperature, salinity, pH, dissolved oxygen, nutrients). Samples of epiphytic biofilms showed a distinct community structure compared to seawater, lower diversity, and remarkably high alginolytic capability, suggesting adaptation to degrade algal biomass. A high microdiversity of populations of the genus Leucothrix (Gammaproteobacteria, Thiotrichales) that accounted for a large fraction of epiphytic communities was observed, and changed over time. Epiphytic assemblages shared more taxa with bottom than with surface seawater assemblages, indicating a certain level of exchange between communities in the forest surroundings. This work provides insight into the impact of U. pinnatifida decay on seawater quality, and the role of microbial communities on adapting to massive biomass inputs through rapid DOM turnover.
Palabras clave:
COASTAL ENVIRONMENTS
,
DOM TURNOVER
,
INVASIVE SEAWEEDS
,
MICROBIAL COMMUNITIES
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(CESIMAR)
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Articulos(IBIOMAR)
Articulos de INSTITUTO DE BIOLOGIA DE ORGANISMOS MARINOS
Articulos de INSTITUTO DE BIOLOGIA DE ORGANISMOS MARINOS
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Lozada, Mariana; Zabala, Maria Soledad; Garcia, Patricia Elizabeth; Dieguez, Maria del Carmen; Bigatti, Gregorio; et al.; Microbial assemblages associated with the invasive kelp Undaria pinnatifida in Patagonian coastal waters: Structure and alginolytic potential; Elsevier; Science of the Total Environment; 830; 154629; 7-2022; 1-10
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