Long-term response of the microbial community to the degradation of DOC released from Undaria pinnatifida

Xie, Yuyang; Su, Jie; Shao, Kuishuang; Hu, Tian; Ming, Hongxia; Shi, Tingting; Wang, Wenjing; Fan, Jingfeng

doi:10.1016/j.marenvres.2023.106313

Cited by 3 publications

(1 citation statement)

References 72 publications

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“…In the seaweed ecosystem, the dominance of Proteobacteria, Cyanobacteria, and Actinobacteria reflects a community engaged towards nutrient cycling and primary production, crucial for marine ecosystems (Singh & Reddy, 2014;Menaa et al, 2020). The presence of Bacteroidetes and Planctomycetes, known for their roles in organic matter decomposition and nitrogen cycling, further underscores the functional diversity within this habitat (Xie et al, 2024;Zhang et al, 2024). These findings were consistent with the global studies on seaweed-associated bacterial communities, spanning a decade, showing dominant presence of key bacterial phyla such as Proteobacteria, Actinobacteria, Bacteroidetes, Planctomycetes, and Cyanobacteria in these ecosystems (Burke et al, 2011;Lachnit et al, 2011;Bengtsson et al, 2012;Mancuso et al, 2016;Cleary & Huang, 2020).…”

Section: Variation In Bacterial Diversity and Community Structure In ...mentioning

confidence: 99%

Comparative metagenomic analysis of bacterial communities and functional profiles in urban-influenced blue carbon ecosystems

Ghose,

Jad

et al. 2024

Preprint

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Mangrove and seaweed ecosystems, as integral components of blue carbon habitats, play pivotal roles in global carbon sequestration and coastal protection, showcasing unique environmental dynamics and biological diversity. This study explores seaweed and mangrove-associated bacterial communities and their functional dynamics in Goa coastal habitats, highlighting their critical ecological roles within blue carbon habitats. Physicochemical analysis revealed contrasting environmental conditions, with the seaweed ecosystem experiencing stable marine influences and the mangrove ecosystem subject to dynamic terrestrial-aquatic interactions. Elevated levels of pathogenic bacteria in both ecosystems indicate significant pollution from anthropogenic activities. Advanced metagenomic techniques, including Illumina’s 16S V3-V4 amplicon sequencing, were employed to assess bacterial diversity. The seaweed ecosystems were predominated by Proteobacteria, Cyanobacteria, and Actinobacteria, crucial for nutrient cycling and organic matter decomposition. In contrast, mangrove ecosystems displayed a more complex microbiota, represented by Firmicutes, adapted to anaerobic conditions. Core microbiome analysis revealed the prevalence of the pathogen Pleurocapsa in seaweeds, suggesting ecosystem health decline, while mangrove microbiomes showed the dominance of genera such as Bacillus and Clostridium, which are key in processing organic material under low-oxygen conditions. Notably, Clostridium levels indicated faecal contamination, underscoring the impact of external pollution. Functional pathway analysis conducted with PICRUSt2 analysis elucidated the metabolic specializations of the microbiomes. Seaweed-associated microbiomes excelled in carbohydrate metabolism, cellular growth and death and environmental information processing, whereas mangrove microbiomes showed advanced capabilities in carbohydrate metabolism, xenobiotics biodegradation and complex organic compound metabolism such as terpenoids and polyketides, reflecting complex microbial dynamics and pollution in mangroves. The findings emphasize the urgent need for effective conservation strategies to protect these vital ecosystems against the rising threats of anthropogenic pressures pollution, and climate change. An enhanced understanding of microbial dynamics and functional capabilities is essential for implementing informed management practices, ensuring the conservation and restoration of these critical blue carbon ecosystems.

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Section: Variation In Bacterial Diversity and Community Structure In ...mentioning

confidence: 99%

Comparative metagenomic analysis of bacterial communities and functional profiles in urban-influenced blue carbon ecosystems

Ghose,

Jad

et al. 2024

Preprint

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Marine heatwaves and disease alter community metabolism and DOC fluxes on a widespread habitat-forming seagrass species (Zostera marina)

Egea,

Jiménez-Ramos,

English

et al. 2024

Science of The Total Environment

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Shifts in macroalgae composition alters carbon flow in Coastal Baltic Sea ecosystems: implications for dissolved organic carbon bioavailability and flux

Hall,

Herkül,

Baltar

et al. 2024

Front. Mar. Sci.

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The extracellular release of dissolved organic carbon (DOC) from marine macroalgae supports coastal ecosystem function by supplying photosynthetically fixed carbon to higher trophic levels via the microbial loop. Despite its widely acknowledged biogeochemical importance, DOC is not typically included in primary production estimates of coastal systems. Additionally, little is known about how changes in species composition and coverage will affect the supply of DOC to coastal systems. Within the context of the Baltic Sea, anthropogenic forces are driving a decline in habitat forming kelp species (Fucus vesiculosus) which is superseded by filamentous/turfing algal species, a pattern of change observed globally in numerous other aquatic systems. To evaluate how the drivers of this change may impact the flow of carbon within the Baltic Sea coastal system, the production of DOC by the filamentous algae (Ectocarpus siliculosus) was examined and its rate of release determined (0.095 mg C · g DW−1 · h−1 in light and 0.070 mg C · g DW−1 · h−1 in dark). In addition, bioassays were used to assess the short-term DOC use by bacteria as a proxy of the lability of the released products, with the majority (28.7% released in light and 18.6% released in dark) of the products remaining after 120 hours. This data was linked with long term macroalgae biomass and coverage surveys in order to assess changes in macroalgae community structure through time and to produce standing stock estimates of F. vesiculosus. DOC production as a metric of algal coverage was used to make a preliminary estimation of how changes in community structure may impact the flow of carbon within the system. Our results suggest that decreased levels of DOC released by filamentous algae relative to F. vesiculosus will act to reduce microbial activity. Our model estimates the presence of approximately 150,000 tonnes of F. vesiculosus (dry weight) within the Estonian coastal system translating to an annual release of 7,391 tonnes of DOC. Our study indicates that filamentous-dominated systems have likely altered carbon flow, impacting the broader ecology of the Baltic Sea. Consequently, the loss of kelp species and the expansion of filamentous algae may alter carbon dynamics, with important ecological consequences for other coastal systems globally.

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Long-term response of the microbial community to the degradation of DOC released from Undaria pinnatifida

Cited by 3 publications

References 72 publications

Comparative metagenomic analysis of bacterial communities and functional profiles in urban-influenced blue carbon ecosystems

Comparative metagenomic analysis of bacterial communities and functional profiles in urban-influenced blue carbon ecosystems

Marine heatwaves and disease alter community metabolism and DOC fluxes on a widespread habitat-forming seagrass species (Zostera marina)

Shifts in macroalgae composition alters carbon flow in Coastal Baltic Sea ecosystems: implications for dissolved organic carbon bioavailability and flux

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