Functional trait variation and nitrogen use efficiency in temperate coastal phytoplankton

Breton, Elsa; Christaki, Urania; Bonato, Simon; Didry, Morgane; Artigas, Luis Felipe

doi:10.3354/meps11974

Cited by 25 publications

(28 citation statements)

References 93 publications

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“…L. danicus showed the highest mean biomass of all the 58 diatoms identified by microscopy and was followed in biomass by Rhizosolenia sp. and G. delicatula (Breton et al, 2017). In the present data set a Labyrinhulea-related OTU (OTU111) was connected with the L. danicus-related OTU (OTU003).…”

Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 49%

“…showed significant connections ( Figure 6A, Table 3). During a 3 year microscopic survey (from May 2011 to June 2014, 47 samples) at a neighboring EEC station L. danicus, Rhizosolenia sp., and G. delicatula were found in 51%, 74% and 70% of the samples (Breton et al, 2017). L. danicus showed the highest mean biomass of all the 58 diatoms identified by microscopy and was followed in biomass by Rhizosolenia sp.…”

Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 96%

“…In comprehensive studies, strong associations between microbes and concentrations of nutrients such as nitrites and nitrates, can identify taxa that contribute in biogeochemical cycling (Falkowski et al, 2008;Fuhrman, 2009). In the EEC the light increase and the limitation in nutrients during early spring, was associated to an increase of 'functional dominance' of phytoplankton (diatoms and P. globosa), promoting nitrogen use efficiency (Breton et al, 2017). However, this was not clearly reflected in the network connections as P. globosa was virtually missing and few connections of nutrients concerned diatoms.…”

Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 99%

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Parasitic Eukaryotes in a Meso-Eutrophic Coastal System with Marked Phaeocystis globosa Blooms

et al. 2017

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This study explored the potential interactions and relations of the putative Symbiotic/Decomposer/Parasitic community (SymbDec) with other taxa and predominant environmental parameters in the eastern English Channel (EEC) over a 2.5 years period (32 sampling dates). The EEC is a meso-eutrophic coastal system portrayed by intense reoccurring patterns in plankton succession with blooms of the Haptophyte Phaeocystis globosa and abundant populations of colonial diatoms and dinoflagellate grazers before and after the bloom. The study of the V2-V3 hypervariable region of the 18S rRNA gene allowed an overview of the planktonic community, which consisted of 32 high-level taxonomic groups. Forty-two percent of the identified OTUs belonged to symbionts, decomposers or other putative parasitic taxa belonging mainly to Syndiniales (MALV-MArine ALveolates), Fungi, Cercozoa, Perkinsea, and others, most of which were plankton parasites. We examined the Local Similarity Analysis (LSA) network of lag delayed correlations on the 142 most abundant OTUs (>0.1% of the total number of reads). LSA showed that 99 OTUs had highly significant connections, involving 26 OTUs characterized as potential parasites, and 2 decomposers. The parasitic network had "small world" characteristics, rendering the assemblage more robust to abiotic variations, but more exposed to the removal of highly associated taxa. The majority of the highly connected OTUs belonged to MALV, which were mainly connected with dinoflagellates, suggesting that it might play an important role on dinoflagellate top-down control. The bloom forming P. globosa was not observed in connection with parasitic OTUs in the network. Four environmental parameters (O 2 , N, T, and N/P) were strongly connected with only 11 OTUs, while correlations between microbes dominated the network.

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Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 49%

Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 96%

Section: Bolidomonas Pacifica (98%) [Ocean Waters]mentioning

confidence: 99%

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Parasitic Eukaryotes in a Meso-Eutrophic Coastal System with Marked Phaeocystis globosa Blooms

et al. 2017

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“…This accumulation of excessive organic matter could result in alteration both in the benthic and pelagic compartments. More recently, Breton et al (2017) suggested with a trait-based approach, that competitive exclusion prevails during Phaeocystis spp. 's blooms.…”

Section: Introductionmentioning

confidence: 99%

Realized niche analysis of phytoplankton communities involving HAB: Phaeocystis spp. as a case study

et al. 2018

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The link between harmful algal blooms, phytoplankton community dynamics and global environmental change is not well understood. To tackle this challenging question, a new method was used to reveal how phytoplankton communities responded to environmental change with the occurrence of an harmful algae, using the coastal waters of the eastern English Channel as a case study. The great interannual variability in the magnitude and intensity of Phaeocystis spp. blooms, along with diatoms, compared to the ongoing gradual decrease in anthropogenic nutrient concentration and rebalancing of nutrient ratios; suggests that other factors, such as competition for resources, may also play an important role. A realized niche approach was used with the Outlying Mean Index analysis and the dynamics of the species' realized subniches were estimated using the Within Outlying Mean Indexes calculations under low (L) and high (H) contrasting Phaeocystis spp. abundance. The Within Outlying Mean Indexes allows the decomposition of the realized niche into realized subniches, found within the subset of habitat conditions and constrained by a subset of a biotic factor. The two contrasting scenarios were characterized by significantly different subsets of environmental conditions and diatom species (BV-step analysis), and different seasonality in salinity, turbidity, and nutrients. The subset L environmental conditions were potentially favorable for Phaeocystis spp. but it suffered from competitive exclusion by key diatom species such as Skeletonema spp., Thalassiosira gravida, Thalassionema nitzschioides and the Pseudo-nitzchia seriata complex. Accordingly, these diatoms species occupied 81% of Phaeocystis spp.'s existing fundamental subniche. In contrast, the greater number of diatoms, correlated with the community trend, within subset H exerted a weaker biological constraint and favored Phaeocystis spp. realized subniche expansion. In conclusion, the results strongly suggest that both abiotic and biotic interactions should be considered to understand Phaeocystis spp. blooms with greater consideration of the preceeding diatoms. HABs needs must therefore be studied as part of the total phytoplankton community.

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“…These different ecosystem accessibility and scientific histories are mirrored in the different research questions addressed in phytoplankton trait-based studies in freshwater and marine systems. Trait-based studies from the open ocean preferentially investigate biogeographic trait patterns (Acevedo-Trejos et al, 2013;Barton et al, 2013) or they have a strong biogeochemical focus aiming for the quantification of globally important processes related to primary production such as carbon-dioxide acquisition, nitrogen fixation (Breton et al, 2017), or oceanic stoichiometry and biochemistry (Litchman et al, 2007(Litchman et al, , 2015Strom, 2008;Finkel et al, 2010;Bonachela et al, 2016), but also on phytoplankton dynamics (Alexander et al, 2015) (Figure 2). In oceanography, many studies model trait-based processes, aiming for broad-scale extrapolation of these globally Vallina et al, 2017).…”

Section: Comparing Freshwater and Marine Trait Studies: Assembly Vs mentioning

confidence: 99%

Measures and Approaches in Trait-Based Phytoplankton Community Ecology – From Freshwater to Marine Ecosystems

Weithoff

Beisner

2019

Front. Mar. Sci.

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Trait-based approaches to investigate (short-and long-term) phytoplankton dynamics and community assembly have become increasingly popular in freshwater and marine science. Although the nature of the pelagic habitat and the main phytoplankton taxa and ecology are relatively similar in both marine and freshwater systems, the lines of research have evolved, at least in part, separately. We compare and contrast the approaches adopted in marine and freshwater ecosystems with respect to phytoplankton functional traits. We note differences in study goals relating to functional trait use that assess community assembly and those that relate to ecosystem processes and biogeochemical cycling that affect the type of characteristics assigned as traits to phytoplankton taxa. Specific phytoplankton traits relevant for ecological function are examined in relation to herbivory, amplitude of environmental change and spatial and temporal scales of study. Major differences are identified, including the shorter time scale for regular environmental change in freshwater ecosystems compared to that in the open oceans as well as the type of sampling done by researchers based on site-accessibility. Overall, we encourage researchers to better motivate why they apply trait-based analyses to their studies and to make use of process-driven approaches, which are more common in marine studies. We further propose fully comparative trait studies conducted along the habitat gradient spanning freshwater to brackish to marine systems, or along geographic gradients. Such studies will benefit from the combined strength of both fields.

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Functional trait variation and nitrogen use efficiency in temperate coastal phytoplankton

Cited by 25 publications

References 93 publications

Parasitic Eukaryotes in a Meso-Eutrophic Coastal System with Marked Phaeocystis globosa Blooms

Parasitic Eukaryotes in a Meso-Eutrophic Coastal System with Marked Phaeocystis globosa Blooms

Realized niche analysis of phytoplankton communities involving HAB: Phaeocystis spp. as a case study

Measures and Approaches in Trait-Based Phytoplankton Community Ecology – From Freshwater to Marine Ecosystems

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