Decadal trajectories of phytoplankton communities in contrasted estuarine systems in an epicontinental sea

Lefran, Angéline; Hernández-Fariñas, Tania; Gohin, Francis; Claquin, Pascal

doi:10.1016/j.ecss.2021.107409

Cited by 4 publications

(3 citation statements)

References 54 publications

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“…Recently, CTA was used on intertidal communities monitored in a single bay, and results also demonstrated stability at the scale of the study area with changes mainly reflected by random population dynamics of structuring prevalent species under strong natural pressures (Sturbois et al 2021b). CTA conducted on phytoplanktonic communities of the Eastern English Channel also demonstrated an overall stability in community composition (Lefran et al 2021). Brittany is a biogeographic transition zone with a high diversity of benthic habitats (Gallon et al 2017) and its geographical location makes it a very open system.…”

Section: Discussionmentioning

confidence: 99%

Long‐term coastal macrobenthic Community Trajectory Analysis reveals habitat‐dependent stability patterns

et al. 2023

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Long-term monitoring programs are fundamental to detect changes in ecosystem health and understand ecological processes. In the current context of increasing anthropogenic threats on marine ecosystems, understanding the dynamics and response of communities becomes essential. We used data collected over 14 years in the REBENT benthic coastal invertebrates monitoring program, at a regional scale in the North-East Atlantic, covering a total of 26 sites and 979 taxa. Four distinct habitats were studied: two biogenic habitats associated with foundation species in the intertidal and subtidal zones and two bare sedimentary habitats in the same respective tidal zones. We used community trajectory analysis (CTA), a statistical approach that allows for quantitative measures and comparisons of temporal trajectories of ecosystems. We compared observed community trajectories to trajectories simulated under a non-directional null model in order to better understand the dynamics of the communities, their potential drivers, and the role of the studied habitats in these dynamics. Despite strong differences in the community compositions between sites and habitats, the communities followed non-directional dynamics during the 14 years monitored, which suggested stability at the regional scale. However, the shape, size, and direction of the trajectories of benthic communities were more similar within than among habitats, also suggesting the influence of the nature of the habitat on community dynamics. Results showed a higher variability in community composition the first years of the monitoring in the intertidal bare habitat and confirmed the role of biogenic habitats in maintaining temporal stability. They also highlighted the need to apprehend the role of transient and rare species and the scale of observation in temporal beta diversity analyses. Finally, our study confirmed the usefulness of CTA to link observed trajectory patterns to fundamental ecological processes.

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Section: Discussionmentioning

confidence: 99%

Long‐term coastal macrobenthic Community Trajectory Analysis reveals habitat‐dependent stability patterns

et al. 2023

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“…Here, we specifically investigated the seasonal dynamics of abundance and activity for an alga-degrading marine flavobacterial genus in a tidally-mixed coastal habitat of the Western English Channel, an epicontinental sea with strong seasonal and interannual variations of climatic, hydrological and biological conditions (Goberville et al, 2010;Lefran et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of a glycan-degrading flavobacterial genus in a tidally-mixed coastal temperate habitat

Brunet

Duff

Rigaut‐Jalabert

et al. 2023

Preprint

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Coastal marine habitats constitute hotspots of primary productivity. In temperate regions, this is due both to massive phytoplankton blooms and dense colonization by macroalgae that mostly store carbon as glycans, contributing substantially to local and global carbon sequestration. Because they control carbon and energy fluxes, algae-degrading microorganisms are crucial for coastal ecosystem functions. Environmental surveys revealed consistent seasonal dynamics of alga-associated bacterial assemblages, yet resolving what factors regulate the in situ abundance, growth rate and ecological functions of individual taxa remains a challenge. Here, we specifically investigated the seasonal dynamics of abundance and activity for a well-known alga-degrading marine flavobacterial genus in a tidally-mixed coastal habitat of the Western English Channel. We show that members of the genus Zobellia are a stable, low-abundance component of healthy macroalgal microbiota and can also colonize particles in the water column. This genus undergoes recurring seasonal variations with higher abundances in winter, significantly associated to biotic and abiotic variables. Zobellia can become a dominant part of bacterial communities on decaying macroalgae, showing a strong activity and high estimated in situ growth rates. These results provide insights into the seasonal dynamics and environmental constraints driving natural populations of alga-degrading bacteria that influence coastal carbon cycling.

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“…Here, we specifically investigated the seasonal dynamics of abundance and activity for an alga‐degrading marine flavobacterial genus in a tidally mixed coastal habitat of the Western English Channel, an epicontinental sea with strong seasonal and interannual variations of climatic, hydrological and biological conditions (Goberville et al, 2010; Lefran et al, 2021). To this aim, we targeted the genus Zobellia , which has received much attention in the last two decades as a specialist of macroalgal degradation among Flavobacteriia (Lami et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of a glycan‐degrading flavobacterial genus in a tidally mixed coastal temperate habitat

Brunet,

Le Duff,

Rigaut‐Jalabert

et al. 2023

Environmental Microbiology

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Coastal marine habitats constitute hotspots of primary productivity. In temperate regions, this is due both to massive phytoplankton blooms and dense colonisation by macroalgae that mostly store carbon as glycans, contributing substantially to local and global carbon sequestration. Because they control carbon and energy fluxes, algae‐degrading microorganisms are crucial for coastal ecosystem functions. Environmental surveys revealed consistent seasonal dynamics of alga‐associated bacterial assemblages, yet resolving what factors regulate the in situ abundance, growth rate and ecological functions of individual taxa remains a challenge. Here, we specifically investigated the seasonal dynamics of abundance and activity for a well‐known alga‐degrading marine flavobacterial genus in a tidally mixed coastal habitat of the Western English Channel. We show that members of the genus Zobellia are a stable, low‐abundance component of healthy macroalgal microbiota and can also colonise particles in the water column. This genus undergoes recurring seasonal variations with higher abundances in winter, significantly associated to biotic and abiotic variables. Zobellia can become a dominant part of bacterial communities on decaying macroalgae, showing a strong activity and high estimated in situ growth rates. These results provide insights into the seasonal dynamics and environmental constraints driving natural populations of alga‐degrading bacteria that influence coastal carbon cycling.

show abstract

Decadal trajectories of phytoplankton communities in contrasted estuarine systems in an epicontinental sea

Cited by 4 publications

References 54 publications

Long‐term coastal macrobenthic Community Trajectory Analysis reveals habitat‐dependent stability patterns

Long‐term coastal macrobenthic Community Trajectory Analysis reveals habitat‐dependent stability patterns

Seasonal dynamics of a glycan-degrading flavobacterial genus in a tidally-mixed coastal temperate habitat

Seasonal dynamics of a glycan‐degrading flavobacterial genus in a tidally mixed coastal temperate habitat

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