Mud, Microbes, and Macrofauna: Seasonal Dynamics of the Iron Biogeochemical Cycle in an Intertidal Mudflat

Beam, Jacob P.; George, S. Elizabeth; Record, Nicholas R.; Countway, Peter D.; Johnston, David T.; Girguis, Peter R.; Emerson, David

doi:10.3389/fmars.2020.562617

Cited by 8 publications

(4 citation statements)

References 89 publications

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“…Boundary conditions such as Corg supply, temperature, and overlying water oxygen concentration affect the sedimentary Fe cycle by regulating benthic community composition, metabolic activities/rates and interactions of the microbial and macrofaunal communities (Dauer et al, 1992;Herman et al, 1999;Nilsson and Rosenberg, 2000;Berelson et al, 2003;Bertics and Ziebis, 2009;Beam et al, 2020). The net effects of bioturbation on the sedimentary Fe cycle and the flux of Fed into the overlying water column in sandy advective sediments are complex.…”

Section: The Effect Of Macrofaunal Activity On the Benthic Fed Cycle ...mentioning

confidence: 99%

Ideas and perspectives: The benthic iron flux from sandy advective bioturbated sediments

Wehrmann

Perger

Dwyer

et al. 2023

Preprint

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Abstract. Multiple investigators have suggested that the benthic flux of dissolved iron (Fed) from continental shelf sediments represents an important source of this micronutrient to ocean waters. The magnitude, biogeochemical controls, and seasonal dynamics of Fed fluxes to date, however, have mostly been studied for muddy cohesive sediments dominated by molecular diffusion. Data from these studies have been included in global biogeochemical models to determine the contribution of this Fe source to the ocean. Fed fluxes from sandy advective sediments have received little consideration, although these sediments cover 50–60 % of the continental shelves. Sandy permeable deposits function as dynamic catalytic filters characterized by the rapid exchange of solutes and infiltration of particles —including labile Corg and reactive metal oxides— and high biogeochemical reaction rates. In this article, we discuss how the fundamentally different modes of solute and particle transport in sands affect the sedimentary Fe cycle and Fed flux. We present a case study in which we simulate bioirrigation in sands in summer and winter. In our experiments, Fed fluxes from non-irrigated sediments under diffusive conditions did not exceed 6 and 13 μmol Fe m-2 d-1 in winter and summer, respectively. Fluxes from irrigated cores reached values of 150 μmol Fe m-2 d-1 (winter) and 115 μmol Fe m-2 d-1 (summer). The results indicate that the pumping activity of the benthic macrofauna plays a key role in controlling the extent of the benthic Fed flux from permeable sediments, and that both biogenic and physical advection enhance fluxes. We argue that bioturbated sandy advective sediments constitute an important benthic Fe source to coastal waters and advocate for a more differentiated treatment of sediment type (muddy diffusive vs. sandy advective) and macrofaunal activity -reflecting different functional groups of the macrobenthos- in global biogeochemical Fe models. A better understanding of the benthic Fe cycle in sandy advective sediments is particularly important to help predict how anthropogenic effects such as changes in the deposition patterns of Corg and metals, the expansion of oxygen minimum zones, and changes in benthic biodiversity will affect the tightly coupled benthic-pelagic ecosystem along continental shelves.

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Section: The Effect Of Macrofaunal Activity On the Benthic Fed Cycle ...mentioning

confidence: 99%

Ideas and perspectives: The benthic iron flux from sandy advective bioturbated sediments

Wehrmann

Perger

Dwyer

et al. 2023

Preprint

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“…Human development and climate change expose tidal flat areas to pollution and habitat destruction, posing a serious threat to the coastal zone's barrier function. In addition, some studies have shown that tidal flat microbes play key roles in the biogeochemical cycles (e.g., nutrient cycling and supply) [5]. Therefore, taxonomic and functional research focused on the unique microbial taxonomic lineages of tidal flats would make it possible to explore their diversity and functions.…”

Section: Introductionmentioning

confidence: 99%

Actinotalea lenta sp. nov., a novel actinomycete isolated from tidal flat sediment

Lu,

Yue,

et al. 2024

International Journal of Systematic and Evolutionary Microbiology

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Two Gram-stain-positive, aerobic, oxidase- and catalase-negative, non-motile, and short rod-shaped actinomycetes, named SYSU T00b441T and SYSU T00b490, were isolated from tidal flat sediment located in Guangdong province, PR China. The 16S rRNA gene sequence similarity, average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between SYSU T00b441T and SYSU T00b490 were 99.3, 99.5 and 97.1 %, respectively. Strains SYSU T00b441T and SYSU T00b490 exhibited the highest 16S rRNA gene sequence similarities to Actinotalea ferrariae CF 5-4T (97.1 %/98.2 %), with ANI values of 74.01/73.88 % and dDDH values of 20.5/20.4 %. In the phylogenomic tree, the two isolates were affiliated with the genus Actinotalea. The genomes of strains SYSU T00b441T and SYSU T00b490 were 3.31 and 3.34 Mb, and both had DNA G+C contents of 72.8 mol%, coding 3077 and 3085 CDSs, three and three rRNA genes, and 53 and 51 tRNAs, respectively. Growth occurred at 15–40 °C (optimum, 28–30 °C), pH 4.0–10.0 (optimum, 7.0) and in the presence of 0–7 % (w/v) NaCl (optimum, 3 %). The major fatty acids (>10 %) of strains SYSU T00b441T and SYSU T00b490 were anteiso-C15 : 0 and C16 : 0. The major respiratory quinone was identified as MK-10(H4). The polar lipids of strains SYSU T00b441T and SYSU T00b490 were diphosphatidyl glycerol, phosphatidylglycerol, phosphoglycolipid, phosphatidyl ethanolamine, two phosphatidylinositol mannosides, two glycolipids and two phospholipids. Based on these data, the two strains (SYSU T00b441T and SYSU T00b490) represent a novel species of the genus Actinotalea, for which the name Actinotalea lenta sp. nov is proposed. The type strain is SYSU T00b441T (=GDMCC 1.3827T=KCTC 49943T).

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“…They are exposed to certain environmental events, such as flooding, habitat destruction, climate changes, and pollution (Duarte et al, 2008), which result in the formation of unique microbial communities (Lv et al, 2016). Microbes in tidal flats play critical roles in regulating ecological processes and biogeochemical cycles (Beam et al, 2020). They are a key player in nutrient cycling by converting organic matter into inorganic forms, which enhance the nutrient supply in marine environments (Lee et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Chondrinema litorale gen. nov., sp. nov., of the phylum Bacteroidota, carrying multiple megaplasmids isolated from a tidal flat in the West Sea, Korea

et al. 2023

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A Gram-stain-negative, long rod, oxidase and catalase-positive strain WSW3-B12T was isolated from red algae on tidal flats in the West Sea, Korea. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that the strain WSW3-B12T had the highest sequence similarity, 92.7%, to Flexithrix dorotheae DSM 6795T, followed by Rapidithrix thailandica TISTR 1750T at 90.8% in the family Flammeovirgaceae of the phylum Bacteroidota. The whole genome sequence determined using both the Nanopore and Illumina platforms revealed that the complete genome consists of 29 contigs, among which contig 1 was a circular chromosome, while the remaining 28 contigs were plasmids. The size of the genome was 10.1 Mbp and the G+C content was 34.1%. The average nucleotide identity (ANI), digital DNA–DNA hybridization (dDDH), average amino acid identity (AAI), and percentage of conserved proteins (POCP), phylogenomic-related indexes between the strain WSW3-B12T and the closest strain Flexithrix dorotheae DSM 6795T, were 76.6%, 19.9%, 57.2%, and 55.6%, respectively, which were all lower than the threshold values to support the creation of a novel genus. A comprehensive genome analysis revealed that the strain WSW3-B12T harbored many of the key genes involved in central metabolism in the main chromosome and also carried important genes for the production of vitamins, quinone, and antimicrobial resistance on the plasmids. The strain also carried genes that are involved in the metabolism of heavy metals such as arsenic, cobalt, copper, and iron on both the chromosome and plasmids. Furthermore, the genome of the strain was highly enriched with carbohydrate-active enzymes (CAZymes), carrying a total of 241 CAZymes. Moreover, a complete CRISPR/Cas system was detected on plasmid 20. The major fatty acids of the strain were iso-C15:0 and C16:1 ω5. The polar lipids contained phosphatidylethanolamine, four unidentified lipids, and four glycolipids. The respiratory quinone was menaquinone 7. Based on the phenotypic, chemotaxonomic, and genomic analyses, the strain WSW3-B12T could be assigned to a novel species and novel genus within the family Flammeovirgaceae, for which the name Chondrinema litorale gen. nov., sp. nov. (type strain WSW3-B12T = KCTC 82707T = GDMCC 1.3198T) is proposed.

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Mud, Microbes, and Macrofauna: Seasonal Dynamics of the Iron Biogeochemical Cycle in an Intertidal Mudflat

Cited by 8 publications

References 89 publications

Ideas and perspectives: The benthic iron flux from sandy advective bioturbated sediments

Ideas and perspectives: The benthic iron flux from sandy advective bioturbated sediments

Actinotalea lenta sp. nov., a novel actinomycete isolated from tidal flat sediment

Chondrinema litorale gen. nov., sp. nov., of the phylum Bacteroidota, carrying multiple megaplasmids isolated from a tidal flat in the West Sea, Korea

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