Seasonal variations of phytoplankton community in relation to environmental factors in an oligotrophic area of the European Atlantic coast (southeastern Bay of Biscay)

Muñiz, Oihane; Rodríguez, José Germán; Revilla, Marta; Laza‐Martínez, Aitor; Seoane, Sergio; Franco, Javier

doi:10.1016/j.rsma.2017.11.011

Cited by 23 publications

(22 citation statements)

References 67 publications

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“…Our results reveal that variations in water temperature and inorganic nutrients (phosphate, nitrate) had the biggest effect on diatom community structure, which is consistent with previous work that used global or regional datasets [30,32]. However, we also identified significant links between diatom community structure and the relative abundance of several key bacterial families previously implicated in important ecological interactions with diatoms (i.e., Rhodobacteraceae, Flavobacteriaceae and Alteromonadaceae).…”

Section: Environmental and Bacterial Drivers Of Continental-wide Diat...supporting

confidence: 91%

“…Temporal studies at specific locations (mostly coastal) [30][31][32] have demonstrated that diatom communities exhibit strong seasonal patterns, with higher biomass generally observed during winter and spring, typically as consequence of seasonal variability in nutrients and temperature [32,33]. Shorter temporal studies with higher resolution (daily timescales) have also identified very rapid changes in diatom community assemblages [29].…”

Section: Introductionmentioning

confidence: 99%

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Diatom Biogeography, Temporal Dynamics, and Links to Bacterioplankton across Seven Oceanographic Time-Series Sites Spanning the Australian Continent

et al. 2022

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Diatom communities significantly influence ocean primary productivity and carbon cycling, but their spatial and temporal dynamics are highly heterogeneous and are governed by a complex diverse suite of abiotic and biotic factors. We examined the seasonal and biogeographical dynamics of diatom communities in Australian coastal waters using amplicon sequencing data (18S-16S rRNA gene) derived from a network of oceanographic time-series spanning the Australian continent. We demonstrate that diatom community composition in this region displays significant biogeography, with each site harbouring distinct community structures. Temperature and nutrients were identified as the key environmental contributors to differences in diatom communities at all sites, collectively explaining 21% of the variability observed in diatoms assemblages. However, specific groups of bacteria previously implicated in mutualistic ecological interactions with diatoms (Rhodobacteraceae, Flavobacteriaceae and Alteromonadaceae) also explained a further 4% of the spatial dynamics observed in diatom community structure. We also demonstrate that the two most temperate sites (Port Hacking and Maria Island) exhibited strong seasonality in diatom community and that at these sites, winter diatom communities co-occurred with higher proportion of Alteromonadaceae. In addition, we identified significant co-occurrence between specific diatom and bacterial amplicon sequence variants (ASVs), with members of the Roseobacter and Flavobacteria clades strongly correlated with some of the most abundant diatom genera (Skeletonema, Thalassiosira, and Cylindrotheca). We propose that some of these co-occurrences might be indicative of ecologically important interactions between diatoms and bacteria. Our analyses reveal that in addition to physico-chemical conditions (i.e., temperature, nutrients), the relative abundance of specific groups of bacteria appear to play an important role in shaping the spatial and temporal dynamics of marine diatom communities.

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Section: Environmental and Bacterial Drivers Of Continental-wide Diat...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Diatom Biogeography, Temporal Dynamics, and Links to Bacterioplankton across Seven Oceanographic Time-Series Sites Spanning the Australian Continent

et al. 2022

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“…Over time, abundances of phytoplankton can vary by several orders of magnitude at the seasonal, interannual and interdecadal time scales as a result of variations in natural environmental conditions and/or from anthropogenic pressures (e.g. Zingone et al, 2010;Muñiz et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Changes in marine phytoplankton diversity: Assessment under the Marine Strategy Framework Directive

Rombouts

Simon

Aubert

et al. 2019

Ecological Indicators

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The Marine Strategy Framework Directive requires EU Member States to assess the Good Environmental Status (GES) of their marine waters in a coherent and strategic manner. For the regional assessment of biodiversity, the OSPAR Intersessional Coordination Group of Biodiversity Assessment and Monitoring (ICG-COBAM) provides substantial advice. Through expert working groups, phytoplankton indicators are currently being developed to measure the state and the change in pelagic diversity, to quantify food web dynamics and to measure the extent of eutrophication impacts. We developed a multi-metric indicator that is compliant with the common OSPAR indicator "Changes in plankton diversity" (PH3). The aim was to describe the structure of the phytoplankton community (alpha diversity) and to detect significant temporal changes (beta diversity) to evaluate the health of pelagic habitats. In this pilot study, we used three coastal time-series in the Western Channel and the north of the Bay of Biscay (North Atlantic, France) to test the efficiency and the performance of several existing diversity indices. We validated two alpha diversity indices, namely the Menhinick Index (D) and the Hulburt Index (δ), based on their complementary ecological information, their strong relationship with habitat characteristics, and their relative ease of interpretation for stakeholders. Temporal shifts or rate of change in community structure were detected by the Local Contributions to Beta Diversity index (LCBD; a beta diversity measure). For the years where significantly high LCBD values were found, the Importance Value Index (IVI) was calculated to potentially identify the taxa (genus) responsible for the "unusual" community structure. For example, at the Ouest Loscolo site in 2008, an elevated LCBD (0.45) coincided with a high dominance value (Hulburt's Index) caused by the occurrence of a monospecific bloom of Leptocylindrus spp. (IVI = 73%) in July (2.2x10 6 cells L-1) and October (8x10 6 cells L-1). In this way, PH3 informs on different aspects of phytoplankton diversity from a community to a genus level. At the current stage of development, however, PH3 acts as a "surveillance" rather than an operational indicator since the relationship to GES is not directly tracked. In the future, by additional testing of PH3 and extending the geographical scope, the robustness of the assessment could be further determined across the OSPAR Maritime Area.

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“…The main phytoplankton bloom occurs in spring. It is mainly composed of microphytoplankton (principally represented by diatoms) especially in coastal waters and estuarine plumes (Dupuy et al, 2011;Muñiz et al, 2018). This bloom reduces considerably the amount of nutrients available, in particular phosphorus.…”

Section: Study Areamentioning

confidence: 99%

Spatio-temporal drivers of microphytoplankton community in the Bay of Biscay: Do species ecological niches matter?

Houliez

Lefebvre

Dessier

et al. 2021

Progress in Oceanography

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Seasonal variations of phytoplankton community in relation to environmental factors in an oligotrophic area of the European Atlantic coast (southeastern Bay of Biscay)

Cited by 23 publications

References 67 publications

Diatom Biogeography, Temporal Dynamics, and Links to Bacterioplankton across Seven Oceanographic Time-Series Sites Spanning the Australian Continent

Diatom Biogeography, Temporal Dynamics, and Links to Bacterioplankton across Seven Oceanographic Time-Series Sites Spanning the Australian Continent

Changes in marine phytoplankton diversity: Assessment under the Marine Strategy Framework Directive

Spatio-temporal drivers of microphytoplankton community in the Bay of Biscay: Do species ecological niches matter?

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