Microorganisms facilitate uptake of dissolved organic nitrogen by seagrass leaves

Tarquinio, Flavia; Bourgoure, Jeremy; Koenders, Annette; Laverock, Bonnie; Säwström, Christin; Hyndes, Glenn A.

doi:10.1038/s41396-018-0218-6

Cited by 47 publications

(69 citation statements)

References 20 publications

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“…At smaller scales, microphytobenthos and microbiota play a critical role in regulating processes in vegetated habitats (Brodersen et al, 2018). For example, leaf microbiota of Posidonia sinuosa increase nitrogen availability and enhance growth (Tarquinio et al, 2018). Only one study examined the microbial community: Wetz et al (2002) found that oyster grazing affected the relative abundance of different microbial groups in salt marshes, but how co‐restoration affects microbial community dynamics deserves future study.…”

Section: Discussionmentioning

confidence: 99%

Facilitating foundation species: The potential for plant–bivalve interactions to improve habitat restoration success

Gagnon

Rinde

Bengil³

et al. 2020

Journal of Applied Ecology

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Vegetated marine and freshwater habitats are being increasingly lost around the world. Habitat restoration is a critical step for conserving these valuable habitats, but new approaches are needed to increase restoration success and ensure their survival. We investigated interactions between plants and bivalves through a review and analysis of 491 studies, determined the effects, mechanisms and key environmental variables involved in and driving positive and negative interactions, and produced guidelines for integrating positive interactions into restoration efforts in different habitats. Fifty per cent of all interactions (both correlative and experimental studies) were positive. These were predominant between epifaunal bivalves and plants in all habitats, and between infaunal bivalves and plants in subtidal habitats. Plants primarily promoted bivalve survival and abundance by providing substrate and shelter, while bivalves promoted plant growth and survival by stabilizing and fertilizing the sediment, and reducing water turbidity. The prevalence of positive interactions increased with water temperature in subtidal habitats, but decreased with water temperature in intertidal habitats. The subset of studies conducted in a restoration context also showed mostly positive interactions. Twenty‐five per cent of all interactions were negative, and these were predominant between plants and infaunal bivalves in intertidal habitats, except sulphide‐metabolizing bivalves, which facilitated plant survival. Interactions involving non‐native species were also mostly negative. Synthesis and applications. Promoting facilitative interactions through plant–bivalve co‐restoration can increase restoration success. The prevalence of positive interactions depends on habitat and environmental conditions such as temperature, and was especially important in subtidal habitats (involving both infaunal and epifaunal bivalves) and in intertidal habitats (involving only epifaunal bivalves). Thus sites and species for co‐restoration must be carefully chosen to maximize the chances of success. If done properly, co‐restoration could increase initial survival, persistence and resilience of foundation species, and promote the recovery of associated biodiversity and ecosystem services.

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Section: Discussionmentioning

confidence: 99%

Facilitating foundation species: The potential for plant–bivalve interactions to improve habitat restoration success

Gagnon

Rinde

Bengil³

et al. 2020

Journal of Applied Ecology

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“…It must be noted, however, that because BG tissues were incubated in hydroponic chambers, there is a possibility that root and rhizome uptake rates are overestimated due to increases in surface area contact with water (Stapel et al, 1996). Also, estimations could be affected by changes in the rhizobiome associated with the seagrass, as this microbiome has been shown to have an important role by changing the available N to seagrasses, both by N fixation or mineralization of FAAs (Tarquinio et al, 2018).…”

Section: Researchmentioning

confidence: 99%

Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment

et al. 2019

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Summary Tropical marine seagrasses live in environments with low nutrient concentrations. However, as land development intensifies along tropical coastlines, the marine environment in which these organisms grow is becoming more nutrient‐rich. Nitrogen (N) uptake, assimilation, translocation and storage under a diversity of N sources in enriched conditions were investigated in two tropical seagrass species, Cymodocea serrulata and Thalassia hemprichii, from an oligotrophic marine environment. Both seagrasses were able to take up different inorganic and organic N sources through their above‐ and belowground tissues when enriched with high N concentrations. The uptake rates of T. hemprichii were generally higher than C. serrulata in leaves and rhizome, whereas root uptake was systematically higher in C. serrulata. Acropetal and basipetal translocation was observed in both species. Reduction and assimilation of N, measured in terms of their nitrate reductase and glutamine synthetase activity, were correlated with nitrate and ammonium uptake rates, respectively. Cymodocea serrulata showed a tendency to immediately use the available N, whereas T. hemprichii allocated more N in assimilation and storage investment. The responses of these seagrasses to N‐enrichment demonstrate their ability to adapt to over‐enrichment by varying N sources in the first step of the eutrophication process.

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“…2017), including some that can provide an additional source of nitrogen to seagrass leaves by mineralizing amino acids (Tarquinio et al. 2018).…”

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confidence: 99%

“…The epibiota are the primary food source for associated invertebrate epifauna-mainly isopods, amphipods (Mittermayr et al 2014), and gastropods (Peduzzi 1987)-that link seagrass productivity to higher trophic levels (Orth et al 1984). These epibionts consist of prokaryotes and eukaryotes with diverse trophic strategies (Bengtsson et al 2017), including some that can provide an additional source of nitrogen to seagrass leaves by mineralizing amino acids (Tarquinio et al 2018).…”

mentioning

confidence: 99%

Microeukaryotic Communities Associated With the Seagrass Zostera marina Are Spatially Structured

Segóvia

Sanders‐Smith

Adamczyk

et al. 2020

J Eukaryotic Microbiology

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Epibiotic microorganisms link seagrass productivity to higher trophic levels, but little is known about the processes structuring these communities, and which taxa consistently associate with seagrass. We investigated epibiotic microeukaryotes on seagrass (Zostera marina) leaves, substrates, and planktonic microeukaryotes in ten meadows in the Northeast Pacific. Seagrass epibiotic communities are distinct from planktonic and substrate communities. We found sixteen core microeukaryotes, including dinoflagellates, diatoms, and saprotrophic stramenopiles. Some likely use seagrass leaves as a substrate, others for grazing, or they may be saprotrophic organisms involved in seagrass decomposition or parasites; their relatives have been previously reported from marine sediments and in association with other hosts such as seaweeds. Core microeukaryotes were spatially structured, and none were ubiquitous across meadows. Seagrass epibiota were more spatially structured than planktonic communities, mostly due to spatial distance and changes in abiotic conditions across space. Seawater communities were relatively more similar in composition across sites and more influenced by the environmental component, but more variable over time. Core and transient taxa were both mostly structured by spatial distance and the abiotic environment, with little effect of host attributes, further indicating that those core taxa would not show a strong specific association with Z. marina.

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Microorganisms facilitate uptake of dissolved organic nitrogen by seagrass leaves

Cited by 47 publications

References 20 publications

Facilitating foundation species: The potential for plant–bivalve interactions to improve habitat restoration success

Facilitating foundation species: The potential for plant–bivalve interactions to improve habitat restoration success

Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment

Microeukaryotic Communities Associated With the Seagrass Zostera marina Are Spatially Structured

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