The Potential and Limitations of Diatoms as Environmental Indicators in Mid-Atlantic Coastal Wetlands

Desianti, Nina; Enache, Mihaela; Griffiths, Michael L.; Biskup, Ksawery J.; Degen, Austin; DaSilva, Michael; Millemann, Daniel R.; Lippincott, Lee; Watson, E. B.; Gray, Andrew B.; Nikitina, Daria; Potapova, Marina

doi:10.1007/s12237-019-00603-4

Cited by 10 publications

(5 citation statements)

References 99 publications

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“…These same genera appeared to be dominant in a metabarcoding study of salt marsh diatoms in South Carolina [52]. Neritic planktonic diatoms also appeared abundant in sediment, which can be expected, as many of them (Chaetoceros, Thalassiosira, and Skeletonema) can either produce resting cells and spores [108] or live on the surface of intertidal sediments (Minidiscus) [26]. At the species level, not much concordance between morphological and molecular identifications was found, which is expected given the low coverage of diatom diversity in reference databases [64,65].…”

Section: Assemblage Compositionmentioning

confidence: 75%

“…At the species level, not much concordance between morphological and molecular identifications was found, which is expected given the low coverage of diatom diversity in reference databases [64,65]. Morphology-based identifications revealed that a high proportion of taxa found in studied pools are common for the marsh soils and mudflats of the mid-Atlantic region [26,109].…”

Section: Assemblage Compositionmentioning

confidence: 89%

“…Several groups of protists are relatively well studied in salt marshes with traditional microscopy approaches. These are diatoms, foraminifera, and testate amoebae that are often used in paleoecological studies because parts of their cells can fossilize [23][24][25][26][27]. Several other groups of organisms found in salt marshes, such as various soft-bodied algae [28][29][30][31], ciliates [32][33][34], and meiofauna [35][36][37], have been more sporadically investigated using traditional microscopy techniques.…”

Section: Introductionmentioning

confidence: 99%

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Microbial Eukaryotes in Natural and Artificial Salt Marsh Pools

Potapova,

Markarian,

King

et al. 2024

Coasts

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Microscopic eukaryotes are important components of coastal wetland ecosystems. The goal of this study was to investigate the diversity of microeukaryotes in the tidal pools of a New Jersey salt marsh and to compare the assemblages of natural and artificial pools excavated for controlling mosquito populations. We evaluated microeukaryotic assemblages using the amplicon sequencing of 18S and rbcL DNA markers and the microscopic identification of diatoms in water and sediment samples. 18S unique amplicon sequence variants (ASV) representing ciliates, dinoflagellates, diatoms, and cercozoans were the most diverse, while the reads of dinoflagellates, diatoms, ciliates, and nematodes were the most abundant. The dominant ASVs were attributed to organisms that are characteristic of coastal plankton and sediments or those known for their resistance to salinity, desiccation, hypoxia, and UV stress. The sediment assemblages were more diverse compared to those from the water column and contained a larger portion of ASVs that were not assigned to any low-rank taxa, reflecting the current gaps in understanding the diversity of microeukaryotes. Most taxonomic groups were significantly different in their abundance and composition between natural and artificial pools. Dinoflagellates, haptophytes, chrysophytes, pelagophytes, and raphidophytes—the groups that include a large proportion of mixotrophic taxa and species known for forming harmful algal blooms—were more abundant in the artificial than in the natural pools. Fungi, labyrinthulomycetes, and peronosporomycetes were also more abundant in artificial pools, which may be related to organic matter enrichment. Diatoms and foraminifera showed an opposite trend of higher abundance in natural pools.

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Section: Assemblage Compositionmentioning

confidence: 75%

Section: Assemblage Compositionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Microbial Eukaryotes in Natural and Artificial Salt Marsh Pools

Potapova,

Markarian,

King

et al. 2024

Coasts

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“…Diatom (Bacillariophyceae) fossil records are used in transitional coastal settings to identify fluctuations between marine, freshwater and terrestrial conditions and impacts of human activity during coastal wetland development (Pande et al, 2015; Parsons et al, 2006; Vos & de Wolf, 1993). Diatoms are used as ecological indicators of significant metal contamination in aquatic environments (Morin et al, 2012) but at low concentrations, co‐effects of nutrients, salinity and substrate dominate coastal diatom assemblages (Desianti et al, 2017, 2019; Pande et al, 2015). Sediment samples (0.1‐g dry mass) were placed in 20 ml of 30% H 2 O 2 and heated in a beaker on a hot plate (90°C, ~2 h) to oxidise organic material.…”

Section: Methodsmentioning

confidence: 99%

Mercury enrichment in anthrosols and adjacent coastal sediments at a Classic Maya site, Marco Gonzalez, Belize

Turner¹,

Graham

Macphail

et al. 2021

Geoarchaeology

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Elevated concentrations of total mercury (THg) are found in the surface soils and flanking wetland sediments at the Classic Maya coastal site of Marco Gonzalez, Belize. Significant concentrations (up to 1.3 µg·g−1 dry mass) of THg occur in leaf litter‐rich soils, as well as in the artefact‐rich anthrosol spread over the vegetated mound site of structures and occupation debris. The abundance and spatial pattern of major and trace elements measured in the surface soils indicate both site‐scale controlling factors of topography, structures and vegetation on soil geochemistry as well as local highs in concentration compared with background, due to human activity. Geochemical stratigraphy of wetland sediment cores shows that a shift from carbonate‐reef sediments to mangrove peat in the 13th century AD was attended by an input of allogenic (mineral) elements, including mercury. A THg concentration peak (0.8 μg·g−1) in brackish pool sediment is 210Pb‐dated to 1960–1970 AD, but the incorporation of mercury in multiple cores adjacent to the site shows increasing mercury inputs to have occurred before, during Classic‐period Maya occupation and following the sites abandonment. Analysis of element values from site‐scale soil sampling, combined with results from off‐site cores, provides a numerical framework upon which outlier values of THg and other element spatial patterns can be assessed, especially the spatial co‐association of elements related to differences in soil–sediment matrices. Geochemical results from active soils developing from occupation deposits (anthrosols) and sediment cores open up questions concerning contemporary and past mercury accumulation at coastal Mayan sites, and the wider interaction of human and natural biogeochemical processes that occur in human‐modified soils and coastal wetland sediments.

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“…They also discussed the potential of metabarcoding for routine application, its limits of application, and proposed some recommendations for future implementation in WFD. Desianti et al (2019) explored the use of benthic and marsh soil diatoms from mid-Atlantic coastal wetlands to infer tidal exposure and nutrients, which can be challenging because of tidal redistribution of diatoms across the intertidal zone. Diatoms could be an independent source of evidence in microfossil-based reconstructions of past sea level and nutrient enrichment.…”

Section: Algal Ecologymentioning

confidence: 99%

Substratum‐associated microbiota

Furey

Lee

Clemans

2020

Water Environment Research

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Highlights of new, interesting, and emerging research findings on substratum-associated microbiota covered from a survey of 2019 literature from primarily freshwaters provide insight into research trends of interest to the Water Environment Federation and others interested in benthic, aquatic environments. Coverage of topics on bottom-associated or attached algae and cyanobacteria, though not comprehensive, includes new methods, taxa new-to-science, nutrient dynamics, auto-and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, and bloom-forming and harmful algae. Coverage of bacteria, also not comprehensive, focuses on the ecology of benthic biofilms and microbial communities, along with the ecology of microbes like Caulobacter crescentus, Rhodobacter, and other freshwater microbial species. Bacterial topics covered also include metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. Readers may use this literature review to learn about or renew their interest in the recent advances and discoveries regarding substratum-associated microbiota. © 2020 Water Environment Federation • Practitioner points • This review of literature from 2019 on substratum-associated microbiota presents highlights of findings on algae, cyanobacteria, and bacteria from primarily freshwaters. • Coverage of algae and cyanobacteria includes findings on new methods, taxa new to science, nutrient dynamics, auto-and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, bloomforming and harmful algae. • Coverage of bacteria includes findings on ecology of benthic biofilms and microbial communities, the ecology of microbes, metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. • Highlights of new, noteworthy and emerging topics build on those from 2018 and will be of relevance to the Water Environment Federation and others interested in benthic, aquatic environments

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The Potential and Limitations of Diatoms as Environmental Indicators in Mid-Atlantic Coastal Wetlands

Cited by 10 publications

References 99 publications

Microbial Eukaryotes in Natural and Artificial Salt Marsh Pools

Microbial Eukaryotes in Natural and Artificial Salt Marsh Pools

Mercury enrichment in anthrosols and adjacent coastal sediments at a Classic Maya site, Marco Gonzalez, Belize

Substratum‐associated microbiota

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