A Case Study on the Dynamics of Phytoplankton Blooms Caused by Tropical Cyclones in the Southeastern Arabian Sea

Cui, Yusheng; Liu, Ziming; Shan, Zhongnan; Shi, Dawei; Ding, Xiaoqi; Lü, Haibin

doi:10.16993/tellusa.30

Cited by 4 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Few studies have followed the evolution of the microbial compartment after a cyclonic event in the tropics and subtropics. They notably showed an increase in chlorophyll a [ 30 – 32 ], changes in taxonomic composition [ 33 – 35 ] and modifications of functional gene activities [ 36 ], supporting the idea of a perturbation of microbial communities at both taxonomic and functional levels. The resilience of communities and ecosystems, defined as the time required for the system to return to its post-disturbance state [ 37 ], depends on cyclone intensity, trajectory, and local hydrodynamic characteristics.…”

Section: Introductionmentioning

confidence: 90%

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Meyneng,

Lemonnier,

Le Gendre

et al. 2024

Environmental Microbiome

View full text Add to dashboard Cite

Background Coastal ecosystem variability at tropical latitudes is dependent on climatic conditions. During the wet, rainy season, extreme climatic events such as cyclones, precipitation, and winds can be intense over a short period and may have a significant impact on the entire land‒sea continuum. This study focused on the effect of river runoff across the southwest coral lagoon ecosystem of Grand Terre Island of New Caledonia (South Pacific) after a cyclonic event, which is considered a pulse disturbance at our study site. The variability of coastal microbiomes, studied by the metabarcoding of V4 18S (protists) and V4–V5 16S (bacteria) rDNA genes, after the cyclone passage was associated with key environmental parameters describing the runoff impact (salinity, organic matter proxies, terrestrial rock origin metals) and compared to community structures observed during the dry season. Results Microbiome biodiversity patterns of the dry season were destructured because of the runoff impact, and land-origin taxa were observed in the coastal areas. After the rainy event, different daily community dynamics were observed locally, with specific microbial taxa explaining these variabilities. Plume dispersal modeling revealed the extent of low salinity areas up to the coral reef area (16 km offshore), but a rapid (< 6 days) recovery to typical steady conditions of the lagoon's hydrology was observed. Conversely, during the same time, some biological components (microbial communities, Chl a) and biogeochemical components (particulate nickel, terrigenous organic matter) of the ecosystem did not recover to values observed during the dry season conditions. Conclusion The ecosystem resilience of subtropical ecosystems must be evaluated from a multidisciplinary, holistic perspective and over the long term. This allows evaluating the risk associated with a potential continued and long-term disequilibrium of the ecosystem, triggered by the change in the frequency and intensity of extreme climatic events in the era of planetary climatic changes.

show abstract

Section: Introductionmentioning

confidence: 90%

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Meyneng,

Lemonnier,

Le Gendre

et al. 2024

Environmental Microbiome

View full text Add to dashboard Cite

show abstract

The Origin of the Matter Matters: The Influence of Terrestrial Inputs on Coastal Benthic Microeukaryote Communities Revealed by eDNA

Meyneng,

Siano,

Mouras

et al. 2024

Environmental DNA

View full text Add to dashboard Cite

Estuaries are a key component of the land‐sea continuum, and their microbial diversity depends on the connection with terrestrial ecosystems. This work aimed to demonstrate that the terrestrial matter carried by rivers influences the structuration of microeukaryote communities of superficial (0–3 cm) sediments collected at the interface between the land and marine coastal areas. To demonstrate this hypothesis, we have chosen the main island of New Caledonia as a study site, a French overseas territory located in the South West Pacific. Using amplicon sequencing of the 18S‐V4 rDNA extracted from sediments, we analyzed microeukaryote community composition in relation to numerous environmental parameters. Samples were collected in five bays influenced by riverine inputs and corresponding to distinct geological features of the watersheds, as revealed by high variations in metal concentrations released from specific minerals in the sediment. Particularly, the influence of ultramafic soils was highlighted by higher nickel concentration (correlated to Co, Cr, Mn, and Fe). Diatoms were the dominant taxonomic group, especially the classes of Bacillariophyceae and Mediophyceae. Then Apicomplexa, Ciliophora, Dinoflagellata, and Cercozoa followed. The metallic composition of the sediment explained 18.46% of the community spatial variability. The selection of ASVs based on their contribution to beta diversity and their correlation with metallic concentrations enabled us to identify spatial patterns. This information could lead to identifying microeukaryote bioindicators of terrestrial influences, particularly of ultramafic origin. We hypothesized that the association between microeukaryotes and metallic compositions is linked to selection processes, given the resistance of some microeukaryotes to some high metallic concentrations. In vitro experiments are needed to confirm this hypothesis. Our results emphasized the role of terrestrial inputs in shaping estuarine diversity and the need to consider the entire land–sea continuum for studying these ecosystems.

show abstract

A case study of precipitation of an anti-S-type track tropical cyclone over the Arabian Sea

Cui

Shen²,

Shi

et al. 2023

Regional Studies in Marine Science

View full text Add to dashboard Cite

A Case Study on the Dynamics of Phytoplankton Blooms Caused by Tropical Cyclones in the Southeastern Arabian Sea

Cited by 4 publications

References 20 publications

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

The Origin of the Matter Matters: The Influence of Terrestrial Inputs on Coastal Benthic Microeukaryote Communities Revealed by eDNA

A case study of precipitation of an anti-S-type track tropical cyclone over the Arabian Sea

Contact Info

Product

Resources

About