Assessing spatial and temporal variability of phytoplankton communities' composition in the Iroise Sea ecosystem (Brittany, France): A 3D modeling approach

Cadier, Mathilde; Sourisseau, Marc; Gorguès, Thomas; Edwards, Christopher A.; Mémery, Laurent

doi:10.1016/j.jmarsys.2017.01.004

Cited by 15 publications

(25 citation statements)

References 69 publications

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“…The hydrodynamic model uses realistic forcing at the oceanic and ocean-atmosphere boundaries to simulate the three-dimensional ocean circulation and hydrodynamics in the Iroise Sea (from 49°30 0 N:06°30 0 W to 47°30 0 N;04°W) over a seasonal cycle. Despite not fully resolving the submesoscale, the 30 vertical sigma levels and the horizontal resolution of 1.5 km of our model configuration are sufficient to reproduce the main observed characteristics of the Iroise Sea with a marked tidal front [Cadier et al, 2017a]. …”

Section: Methodsmentioning

confidence: 99%

“…The model-specific setup used in this study is exactly the same that has been used in Cadier et al [2017aCadier et al [ , 2017b to characterize the spatial variability of phytoplankton functional and phenotypic diversity at seasonal scale in the Iroise Sea. An extensive description of our regional setup and an exhaustive list of the model Finally, tidal forcing is performed using 15 tidal frequencies.…”

Section: Methodsmentioning

confidence: 99%

“…This variability (approximately five phenotypes) is relatively low when compared to the regional spatial variability (ranging from~35 to 50 coexisting phenotypes) [Cadier et al, 2017b]. Nonetheless, the fluctuations of environmental conditions (transient stratification) act as a facilitating mechanism to promote high diversity.…”

Section: 1002/2017gl074173mentioning

confidence: 95%

“…During summer, our simulations thus show a dominant signal of the fortnightly variability (driven by the spring/neap tide cycle) leading to a temporal variation of phytoplankton diversity in the tidally impacted region of the Iroise Sea. This variability (approximately five phenotypes) is relatively low when compared to the regional spatial variability (ranging from~35 to 50 coexisting phenotypes) [Cadier et al, 2017b]. Nonetheless, the fluctuations of environmental conditions (transient stratification) act as a facilitating mechanism to promote high diversity.…”

Section: 1002/2017gl074173mentioning

confidence: 95%

“…The temporal variability of the surface mixed-layer depth (MLD) (Figure 1b) shows distinctive patterns. The offshore area (southwest; with a bathymetry >100 m) displays substantial seasonal variability [Simpson and Pingree, 1978;Schultes et al, 2013;Cadier et al, 2017a] but remains permanently stratified (with no marked signal of tidal mixing on the MLD) during boreal summer with tidal mixing from deep bottom friction not being strong enough to break the stratification up to the surface. As bathymetry becomes shallower (northeast region with bathymetry comprised between 35 and 100 m), the MLD variability increases significantly due to the effect of tidal vertical mixing on the water column stability.…”

Section: Tidal Effect On Vertical Stability Phytoplankton Biomass Amentioning

confidence: 99%

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Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Cadier

Gorguès

L’Helguen

et al. 2017

Geophysical Research Letters

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In some regions, tidal energy can be a key factor in the generation of variability in physical and biogeochemical properties throughout the water column. We use a numerical model resolving tidal cycles and simulating diversity in phytoplankton to assess the impact of tidal mixing on vertical stability and phytoplankton community (total biomass and diversity) in a macrotidal sea (Iroise Sea, France). Two different time scales have been considered: semidiurnal and spring/neap tidal cycles. Our results show that the latter is the one primarily influencing the phytoplankton growth conditions by modifying the vertical stratification. During spring tide, the growth is rather light limited, whereas neap tide conditions lead to vertical stabilization and better light conditions in the shallow surface layer. The transition from high to low tidal mixing conditions is thus associated with a total phytoplankton biomass increase (caused by the rapid development of fast‐growing diatoms) and reduced phytoplankton diversity.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: 1002/2017gl074173mentioning

confidence: 95%

Section: 1002/2017gl074173mentioning

confidence: 95%

Section: Tidal Effect On Vertical Stability Phytoplankton Biomass Amentioning

confidence: 99%

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Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Cadier

Gorguès

L’Helguen

et al. 2017

Geophysical Research Letters

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Variability of growth rates and thermohaline niches of Rhizostoma pulmo’s pelagic stages (Cnidaria: Scyphozoa)

et al. 2021

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In recent decades, an increase in the abundance and frequency of bloom events has been reported for the scyphozoan Rhizostoma pulmo in the Mediterranean Sea. Understanding such events requires a thorough assessment of the species' population dynamics through environmental windows allowing species development. The semi-enclosed coastal lagoon of Bages Sigean, France (43 degrees 05 ' 12.72 '' N; 3 degrees 00 ' 35.3 '' E) offers an exceptional framework for investigating the population dynamics of the species, and how its growth rates and environmental niches vary over time. Three cohorts starting in April, May and June 2019 were identified, while the overall population growth reached the maximum biomass (10.2 g m(-3)) in July. Bell diameter and total length were identified as the best morphological proxies of biomass estimation. The abundances of the two most abundant copepods' species appear to drive R. pulmo's dynamics in the lagoon. Based on multinomial analysis and using the von Bertalanffy model, different growth rates for juveniles (4.7 and 2.4 mm day(-1)) and adults (1.8 and 0.9 mm day(-1)) were determined for the first two cohorts. Thermohaline niches varied during ontogeny, but also among populations in three coastal Mediterranean lagoons: Bages Sigean (France), Mar Menor (Spain) and Bizerte (Tunisia), shedding light on the metapopulation dynamics of R. pulmo inhabiting the Mediterranean Sea. The pressing need for understanding the dynamics of jellyfish abundances and their impacts on ecosystems, calls for increased efforts on monitoring these populations and their life history traits to parametrize and build reliable ecosystem models.

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Structure and diversity of the bacterial community of an Arctic estuarine system (Kandalaksha Bay) subject to intense tidal currents

Gorrasi

Pesciaroli

Barghini

et al. 2019

Journal of Marine Systems

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Assessing spatial and temporal variability of phytoplankton communities' composition in the Iroise Sea ecosystem (Brittany, France): A 3D modeling approach

Cited by 15 publications

References 69 publications

Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Variability of growth rates and thermohaline niches of Rhizostoma pulmo’s pelagic stages (Cnidaria: Scyphozoa)

Structure and diversity of the bacterial community of an Arctic estuarine system (Kandalaksha Bay) subject to intense tidal currents

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