Do diatoms dominate benthic production in shallow systems? A case study from a mixed seagrass bed

Cox, T. Erin; Cebrián, Just; Tabor, Marnie; West, Laura; Krause, Jeffrey W.

doi:10.1002/lol2.10167

Cited by 23 publications

(7 citation statements)

References 29 publications

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“…Chlorophyll a concentration in the first centimetre of the sediment ranged from 6 to 9 µg g -1 , equivalent to 43 to 59 mg m -2 . These values were in the range of concentrations measured in other coral reef sediments where sediments are net autotrophic and microphytobenthos has been shown to be a relevant primary producer in the benthic compartment (Heil et al, 2004;Hochard et al, 2012;Cox et al, 2020). Despite the similar biomass of microphytobenthos (based on the chlorophyll concentrations) suggesting certain relevance of the microphytobenthos biomass in the benthic compartment, our measurements showed that the sediment was net heterotrophic.…”

Section: Sediment Metabolismsupporting

confidence: 56%

Contribution of the seagrass Syringodium isoetifolium to the metabolic functioning of a tropical reef lagoon

Olivé

García‐Robledo²,

Silva³

et al. 2022

Front. Mar. Sci.

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Seagrasses are gaining attention thanks to their metabolism and potential major role as carbon sinks, with further implications as nature-based solutions against climate change. Despite their recognized importance and the growing number of studies published, there is still a striking paucity of information on seagrass metabolism and contribution to biogeochemical cycles for some seagrass species and ocean areas. In this study we assessed the metabolic balance and nutrient cycling contribution of seagrasses to the benthic compartment of a tropical reef lagoon in Reunion Island, providing original information on a barely studied seagrass species (Syringodium isoetifolium) and a poorly studied ocean region (West Indian Ocean). We measured the net productivity, respiration and the metabolic balance in different components of the lagoon benthic compartment (i.e. seagrass, sediment, and benthic community) and the water-sediment nutrient benthic fluxes at differently impacted sites within the lagoon. The biogeochemical environmental variability, including inorganic and organic indicators of anthropogenic contamination, was also assessed at each site.Large spatial variability was detected in the metabolic balance of each benthic component assessed, also associated with the natural and/or anthropic-driven environmental variability found in the lagoon. The seagrass S. isoetifolium was net autotrophic across the lagoon and contributed to the lagoon benthic metabolism with net plant productivity exceeding by one order of magnitude the plant respiration. The lowest seagrass metabolism was detected at the impacted site. The metabolic balance of the sediment was heterotrophic but the high productivity of S. isoetifolium contributed to reducing the heterotrophy of the whole benthic community. The lagoon-wide benthic metabolic balance was slightly heterotrophic, but the associated uncertainty ranged from autotrophy to heterotrophy. Nutrient concentrations in the lagoon were low and the benthic community capacity for nutrient retention (uptake) and removal (denitrification and anammox) indicated potential for buffering moderate nutrient inputs into the lagoon. Organic contaminants of emerging concern (CECs) were low but detectable in the lagoon, especially in highly frequented beach areas, arising as an environmental quality indicator of interest.

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Section: Sediment Metabolismsupporting

confidence: 56%

Contribution of the seagrass Syringodium isoetifolium to the metabolic functioning of a tropical reef lagoon

Olivé

García‐Robledo²,

Silva³

et al. 2022

Front. Mar. Sci.

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“…In addition to being primary drivers in the cycling of major nutrients globally, these photosynthetic microorganisms provide other essential ecological services in terms of sustainability of planktonic and benthic habitats. Their position at the base of the aquatic food chain results from the metabolic activity of their cells which make diatoms the food and energy source for numerous invertebrates, micro-and meiograzers, but also vertebrates, e.g., benthic fish [5]. This important role in the food chain is based on the fact that diatoms primary storage materials are triacylglycerols (TAGs, e.g., [6]) and carbohydrates (chrysolaminarin, e.g., [7]).…”

Section: Introductionmentioning

confidence: 99%

Lipid Constituents of Diatoms (Halamphora) as Components for Production of Lipid Nanoparticles

et al. 2022

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Lipid nanocarriers smaller than 200 nm may be used as pharmaceutical/cosmetic raw materials as they are able to penetrate the skin. The nanostructured lipid carriers (NLCs) based on microalgae oil (Schizochytrium) and lipids extracted from diatoms (Halamphora cf. salinicola (strain SZCZM1454A)) were produced by the HSH (high shear homogenization) method. Fatty acid profile of crude oil from diatoms indicated the presence of palmitoleic, palmitic, stearic acid, oleic and myristic acids as the most common fatty acids in the strain investigated. The quantitative composition and the synthesis condition of NLC dispersions were optimized by using the full factorial designs. The physicochemical parameters of the obtained lipid nanocarriers were characterized by SEM, DSC and XRD measurements and the fraction with the optimum parameters (size below 200 nm, polydispersity index not exceeding 0.2 and zeta potential higher than +45 mV) was selected for further study. The positive charge of the obtained lipid nanoparticles is beneficial as permits electrostatic bonding with the negatively charged skin surface. As follows from stability tests, the NLCs obtained could be stored at room temperature.

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“…They play key roles in the sustainability of the littoral ecosystems (cf. Cox et al, 2020) including suspension feeders, thanks to their prominent place in the food web as primary producers (Houki et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A New Insight Into Amicula, a Genus of Tiny Marine Benthic Diatoms With the Description of Two New Tropical Species and the Largest Mitogenome Known for a Stramenopile

Gastineau

Ashworth

et al. 2022

Front. Mar. Sci.

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The current article focuses on the morphological and molecular characterization of the often inconspicuous genus Amicula. This recently erected genus from brackish and marine sediments was monotypic but here we describe two new tropical species: Amicula micronesica sp. nov. and Amicula vermiculata sp. nov. Once considered an incertae sedis genus regarding its higher rank taxonomy, its position among the family Diploneidaceae is proposed here by molecular phylogenetics. The complete plastid and mitochondrial genomes of Amicula micronesica sp. nov. are also presented here. It appears that the 177614-bp long mitogenome is the biggest yet recorded among stramenopiles, due to its invasion by 57 introns. Moreover, it utilizes the genetic code 4 for translation instead of the code 1 usually found among diatoms.

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Do diatoms dominate benthic production in shallow systems? A case study from a mixed seagrass bed

Cited by 23 publications

References 29 publications

Contribution of the seagrass Syringodium isoetifolium to the metabolic functioning of a tropical reef lagoon

Contribution of the seagrass Syringodium isoetifolium to the metabolic functioning of a tropical reef lagoon

Lipid Constituents of Diatoms (Halamphora) as Components for Production of Lipid Nanoparticles

A New Insight Into Amicula, a Genus of Tiny Marine Benthic Diatoms With the Description of Two New Tropical Species and the Largest Mitogenome Known for a Stramenopile

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