Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

Abadie, Arnaud; Borges, Alberto; Champenois, Willy; Gobert, Sylvie

doi:10.1007/s00227-017-3199-5

Cited by 7 publications

(10 citation statements)

References 60 publications

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“…The biogeochemistry of P. oceanica sediments is highly influenced by the seagrass seasonal growth, leaf burial and decay by microorganisms. P. oceanica growth shows a late spring maximum and a fall minimum [14], when most nutrients within the sediment are consumed and sulfide accumulates [15]. Our porewater profiles confirm this pattern, with higher DIN concentrations and DIN:DIP ratios in April compared to October (p < 0.01; Fig.…”

Section: Resultssupporting

confidence: 77%

Chemosymbiotic bivalves contribute to the nitrogen budget of seagrass ecosystems

Cardini

Bartoli

Lee

et al. 2019

Preprint

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In many seagrass sediments, lucinid bivalves and their sulfur-oxidizing symbionts are thought to underpin key ecosystem functions, but little is known about their role in nutrient cycles, particularly nitrogen. We used natural stable isotopes, elemental analyses, and stable isotope probing to study the ecological stoichiometry of a lucinid symbiosis in spring and fall. Chemoautotrophy appeared to dominate in fall, when chemoautotrophic carbon fixation rates were up to one order of magnitude higher as compared to the spring, suggesting a flexible nutritional mutualism. In fall, an isotope pool dilution experiment revealed carbon limitation of the symbiosis and ammonium excretion rates up to 10-fold higher compared to fluxes reported for non-symbiotic marine bivalves. These results provide evidence that lucinid bivalves can contribute substantial amounts of ammonium to the ecosystem. Given the preference of seagrasses for this nitrogen source, lucinid bivalves’ contribution may boost productivity of these important blue carbon ecosystems.

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Section: Resultssupporting

confidence: 77%

Chemosymbiotic bivalves contribute to the nitrogen budget of seagrass ecosystems

Cardini

Bartoli

Lee

et al. 2019

Preprint

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“…The origin of these anchoring patches was attested to through the observation of mechanical impacts along their edges corresponding to the abrasion resulting from anchor removal. Study sites nearby the STARESO research station and in the Alga Bay are the same than those studied by Abadie et al (2016Abadie et al ( , 2017.…”

Section: Sampling Design and Study Sitesmentioning

confidence: 99%

“…Natural factors such as erosive bottom currents and extreme seasonal wave events shape the P. oceanica seascape by generating sand patches within the meadow matrix ( Figure 1A) and restraining the development and colonization of the plant at shallow depths (Gobert et al, 2016;Vacchi et al, 2017). Natural patches derived from bottom currents present a structural duality with an eroded vertical matte edge opposed to a colonized one (Abadie et al, 2017). In addition, the particle flux within the canopy drives the meadow's vertical growth and results in the elevation of the matte, i.e., a complex of dead/living rhizomes, roots, and sediments .…”

Section: Introductionmentioning

confidence: 99%

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Structural Changes of Seagrass Seascapes Driven by Natural and Anthropogenic Factors: A Multidisciplinary Approach

Abadie

Richir

Lejeune³

et al. 2019

Front. Ecol. Evol.

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“…Similarly, Pace et al (2017) show that at shallow depth (6-11 m depth), high energy wave climate leads to an increase of meadow patchiness and a decrease in architectural complexity. At greater water depths, even if negligible, currents derived from wave energy result in a decrease of meadow cover resulting in the generation of patches of different bottom type (bare matte or sandy bottom) (Abadie et al, 2017;Gobert et al, 2016;Vacchi et al, 2010). Furthermore, P. oceanica meadows enhance sediment stabilization of sandy patches present in their vicinity (Vacchi et al, 2017).…”

Section: Available Literature On Posidonia Oceanica Seascape Ecologymentioning

confidence: 99%

Seascape ecology in Posidonia oceanica seagrass meadows: Linking structure and ecological processes for management

Abadie

Pace

Gobert

et al. 2018

Ecological Indicators

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A B S T R A C TSeagrass meadows constitute marine habitats in shallow water temperate and tropical coastal areas worldwide that have a high ecological and economic importance. Amongst the 60 or so seagrass species, the endemic Mediterranean species Posidonia oceanica forms meadows that are arguably the most important shallow water coastal habitat in the region but which are subjected to high anthropogenic pressures. Because of the relatively large size of the plant, the meadows formed by this seagrass have high architectural and morphological complexity, which results in different morphotypes or seascapes. While numerous studies of P. oceanica architectural characteristics for continuous meadows of the seagrass are available, few works have addressed seascape ecological features and the influence of environmental factors (natural and anthropogenic) thereon. In the present review, we give an overview of P. oceanica meadow architectural and morphological characteristics and how these contribute to Mediterranean landscapes and seascapes. Studies addressing the influence of natural and anthropogenic factors on morphometric features of different meadow types and landscape ecological characteristics of P. oceanica habitat are also reviewed, as well as their influence on ecosystem processes. Finally, by considering the available data and tools for seascape studies, we present a discussion on methods to assess seagrass seascapes within the framework of coastal management. Our review highlights several gaps in P. oceanica seascape ecology knowledge such as the lack of data on the spatial distribution of this engineer species, and the possibility to use modern techniques and procedures for analysing structural and ecosystemic data.

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Natural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types

Cited by 7 publications

References 60 publications

Chemosymbiotic bivalves contribute to the nitrogen budget of seagrass ecosystems

Chemosymbiotic bivalves contribute to the nitrogen budget of seagrass ecosystems

Structural Changes of Seagrass Seascapes Driven by Natural and Anthropogenic Factors: A Multidisciplinary Approach

Seascape ecology in Posidonia oceanica seagrass meadows: Linking structure and ecological processes for management

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