Analysis of Bacteria–Phytoplankton relationships at three discrete locations in the Eastern Arabian Sea during winter

Fernandes, Veronica; Bogati, Kalisa

doi:10.1016/j.csr.2022.104751

Cited by 7 publications

(3 citation statements)

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“…Variations in phytoplankton, nutrients and other environmental variables dynamically influence the abundance and composition of microbial communities over time and space [13], [14], [15]. Anthropogenic inputs, such as riverine influx during the monsoon, activities like coastal urbanization, industries, maritime transport, oil extraction and refining, tourism, and aquaculture, affect both the seawater column and marine sediments through benthic-water flux (upwelling processes) [16].…”

Section: Introductionmentioning

confidence: 99%

Article Seasonal Surges in Bacterial Diversity along the Coastal Waters of the Eastern Arabian Sea

Hafza,

Parvathi,

Pradeep Ram

et al. 2024

Preprint

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The upwelling phenomenon plays a vital role within marine ecosystems, transporting essential nutrients from the bottom to the surface and boosting biological productivity. However, the bacterial community structure in upwelling zones along Western coast of India (WCI) is under-studied. This research systematically examines bacterial diversity across three sea-sons—Pre-monsoon (PR), Monsoon (MN), and Post-monsoon (PM)—using next-generation se-quencing. Our findings show distinct spatial patterns of bacterial communities in the Arabian Sea and demonstrate that ecological variations influence bacterial distribution in this dynamic envi-ronment. During MN, the bacterial community was notably distinct and diverse than during PR and PM, despite their lower abundance in MN. Non-Metric MDS cluster analysis revealed a 78% similarity (at order level) between PR and PM, indicating MN supports unique bacterial diversi-ty. KEGG analysis showed significant seasonal variations in metabolic functions, with increased functional potential during MN. Additionally, Carbohydrate-Active enZymes (CAZymes) analy-sis revealed distinct seasonal profiles, among which the GH13 enzymes were the most prevalent glycoside hydrolases during MN; predominantly sucrose phosphorylase and glucosidase, known for breaking down glucan deposits derived from phytoplankton. The CAZymes profiles sup-ported taxonomic and KEGG pathway findings, reinforcing that microbial communities are sea-sonally distinct and functionally adapted to changing availability of nutrients.

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Section: Introductionmentioning

confidence: 99%

Article Seasonal Surges in Bacterial Diversity along the Coastal Waters of the Eastern Arabian Sea

Hafza,

Parvathi,

Pradeep Ram

et al. 2024

Preprint

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“…Seasonal monsoonal wind reversals, and upwelling produce exceptionally high amounts of primary productivity in the Arabian Sea (Wiggert et al, 2005;Parab et al, 2006;(Gerson et al, 2014); Jyothibabu et al, 2021;Chowdhury et al, 2021). The phytoplankton-released compounds, as well as other environmental variables, affect the number and composition of microbial communities over time and space (Arandia-Gorostidi et al, 2022;(Caroppo et al, 2022;Fernandes & Bogati, 2022;Sison-Mangus et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Prokaryotes in the Arabian Sea: Insights into the Interplay of Physicochemical and Biological Variables from Epi to Bathypelagic zone

Hafza,

et al. 2023

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Bacteria play a crucial role in the Arabian Sea ecosystem by actively participating in the decomposition of organic matter, facilitating nutrient remineralisation and thereby enhancing overall productivity. This study aims to resolve the spatial and seasonal variations in prokaryotic abundance (PA) and biomass with respect to the physicochemical parameters during Spring Inter Monsoon (SIM, April-May), Summer monsoon (SM, June-September), and Winter Monsoon (WM, October-February) in the eastern Arabian Sea. Prokaryotic abundance and biomass distribution estimated using microscopic techniques revealed their highest abundance during SIM, ranging from 2.29 to 4.41 × 106 Cells mL-1 and 8.39 to 21.82 µgL-1, respectively. Similarly, high PA and biomass were observed in late SM (September), ranging from 2.01 to 3.96 × 106 Cells mL-1 and 8.74 to 16.70 µgL-1, respectively, which was preceded by a higher abundance of phytoplankton (Chlorophyll a- 14.57 mg m-3) during peak SM (August). Spatially, the mid-photic waters (M, 75–100 m) sustained high PA during winter convective mixing (January-February). DistLM analysis revealed that ammonia, dissolved oxygen and temperature were the most important factors influencing the PA in the upper photic zone. In contrast, nutrients such as silicate, nitrate, nitrite, and phosphate were the major determining factors in the deeper disphotic waters (200–2000 m) which sustained a stable PA throughout the study period. This study throws light on the intricate interplay between physicochemical and biological variables in shaping prokaryotic population during various physical forcings such as upwelling and convective mixing through intense sampling efforts in the Arabian Sea.

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“…In marine ecosystems, heterotrophic bacteria are known to significantly contribute to microbial food webs and biogeochemical cycles by consuming up to half of the primary production (PP) through dissolved OM (Ducklow and Carlson, 1992;Azam et al, 1993;Lønborg et al 2019). Bacteria primarily receive the dissolved organic substrates needed for their growth and biomass production from healthy growing phytoplankton, dead and decaying cells and through sloppy feeding by zooplankton (Fernandes and Bogati 2022). Bacterial extracellular enzymes initiate the microbial remineralization of phytoplankton-derived OM throughout the water column and sediment.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the functional profiles of cultivable bacterial communities in the water and sediments during the southwest monsoon season, along the west coast of India

Parab

Ghose

Manohar

2023

Preprint

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Understanding the functional profiles of cultivable bacterial communities is crucial for comprehending their ecological significance in marine environments. This study investigates the functional profiles of cultivable bacterial communities in the water and sediments during the productive, southwest monsoon season, along the west coast of India. The southwest monsoon plays a vital role in shaping the hydrological and biogeochemical characteristics of this region, making it an ideal period to study bacterial communities and their functions. Our study utilizes a cultivation techniques to study taxonomy as well as functional assays to elucidate the diverse organic substrates utilization capabilities of bacterial communities. Cultivable bacteria were isolated from discrete water depths and sediment samples from the coastal and off-shore region. Subsequently the carbohydrase, lipase and protease assays were performed to assess its functional potential. The results of this study reveal a rich diversity of cultivable bacterial communities including, representative from Proteobacteria, Firmicutes and Actinobacterial phylum with diverse functional profiles. The functional analyses provide insights into the metabolic capabilities of the bacteria, including organic substrates degradation, processes. The bacterial taxonomic diversity and enzymes activities were significantly different (p < 0.001) among the water and sediment bacterial morphotypes. In conclusion, this research sheds light on the functional profiles of cultivable bacterial communities in the water and sediments along the west coast of India during the productive southwest monsoon season. The comprehensive analysis of their functional capabilities provides insights into their ecological roles and potential significance in organic matter recycling. These findings contribute to our understanding of microbial diversity and ecosystem functioning in coastal environments and lay the groundwork for further research on harnessing the significance of these bacteria in biogeochemical cycling.

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Analysis of Bacteria–Phytoplankton relationships at three discrete locations in the Eastern Arabian Sea during winter

Cited by 7 publications

References 64 publications

Article Seasonal Surges in Bacterial Diversity along the Coastal Waters of the Eastern Arabian Sea

Article Seasonal Surges in Bacterial Diversity along the Coastal Waters of the Eastern Arabian Sea

Dynamics of Prokaryotes in the Arabian Sea: Insights into the Interplay of Physicochemical and Biological Variables from Epi to Bathypelagic zone

Elucidating the functional profiles of cultivable bacterial communities in the water and sediments during the southwest monsoon season, along the west coast of India

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