Bacillariophyceae

Kociolek, John Patrick; Spaulding, Sarah A.; Lowe, Rex L.

doi:10.1016/b978-0-12-385876-4.00016-5

Cited by 22 publications

(6 citation statements)

References 225 publications

(138 reference statements)

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“…However, we recorded that the dominance and presence of some species in the current dams had a correlation with the water level at the moment the sample was taken. For example, RSVR‐A was full of water, and here, we recorded various taxa, such as Rhopalodia gibba , an epiphytic species often found in water with little flow speed; Navicula libonensis , a species which usually lives submerged in electrolyte‐rich water; and Frankophila similioides , a subaerial diatom found in shallow ponds and rivers in the Andes (Kociolek et al, 2015; Maidana et al, 2011; Rumrich et al, 2000). Conversely, RSVR‐Y was not in use at the time the sample was collected, and it has some stagnant water and macrophytes rooted in the bottom, where the dominant diatom was Nitzschia palea , which may thrive in very shallow and vegetated environments (Lange‐Bertalot, 1979; Van Dam et al, 1994).…”

Section: Discussionmentioning

confidence: 89%

Identifying pre‐Hispanic water storages in agricultural areas of south‐central Andes through diatom evidence

et al. 2022

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In the Andes, there are several pre-Hispanic irrigation networks with structures destined for water storage. However, it has not been widely discussed in archaeological research. This is probably due to their being difficult to identify. The aim of this study is to explore the use of diatom assemblage analysis as a methodological tool suitable to help in the identification and characterization of these ancient hydraulic structures. We analyzed two archaeological structures interpreted as water reservoirs from north-western Argentina (EH1 in Antofagasta de la Sierra and U-88R1 in Yocavil) and compared them to current reservoirs. The diatom species composition and the changes in the dominant ecological groups in the studied structures highlight different periods of hydraulic behavior. EH1 contained and stored water, but there were periods of time in which there was a lack of use or abandonment of the structure. However, the U88-R1 structure does not have diatom evidence of containing standing water for a prolonged time but presence of wet soils. Thus, the structure could have been used for other water management strategies. The results show that diatom analysis is a methodological tool with a high potential to study ancestral hydrotechnologies.

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Section: Discussionmentioning

confidence: 89%

Identifying pre‐Hispanic water storages in agricultural areas of south‐central Andes through diatom evidence

et al. 2022

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“…Bacillariophyceae, the raphid diatoms, were found to be prominent in the gut profile of both river and weir chironomids. These diatoms have been reported to have conglomeration to live in the plankton community [ 57 ]. Olefeld et al (2020) [ 58 ] stated that the diversity pattern in the freshwater system depends predominantly on diatoms (Bacillariophyceae), Ochrophyta (Chrysophyceae, Eustigmatophyceae), and fungi.…”

Section: Discussionmentioning

confidence: 99%

Profiling Analysis of Filter Feeder Polypedilum (Chironomidae) Gut Contents Using eDNA Metabarcoding Following Contrasting Habitat Types—Weir and Stream

Rangaswamy

Kim

et al. 2022

IJERPH

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We analyzed the dietary composition of Polypedilum larvae among two contrasting habitats (river and weir). Our approach was (i) to apply eDNA-based sampling to reveal the gut content of the chironomid larvae, (ii) the diversity of gut contents in the two aquatic habitats, and (iii) assessment of habitat sediment condition with the food sources in the gut. The most abundant food was Chlorophyta in the gut of the river (20%) and weir (39%) chironomids. The average ratio of fungi, protozoa, and zooplankton in river chironomids gut was 5.9%, 7.2%, and 3.8%, while it was found decreased to 1.2%, 2.5%, and 0.1% in weir chironomids. Aerobic fungi in river midge guts were 3.6% and 10.34% in SC and IS, while they were in the range of 0.34–2.58% in weir midges. The hierarchical clustering analysis showed a relationship of environmental factors with food contents. Abiotic factors (e.g., pH) in the river and weir habitats correlated the clustered pattern with phytoplankton and minor groups of fungi. This study could help understand the food source diversity in the chironomid and habitat environmental conditions by using eDNA metabarcoding as an effective tool to determine dietary composition.

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“…Regarding the latter case, surface morphologies potentially preservable as fossil biosignatures have been observed as the result of the interactions between diatoms and filamentous cyanobacteria in continental sabkha environments (Barbieri and Cavalazzi, 2018). Even in the present case study, the leading players are filamentous cyanobacteria – which can form dense mats in saltern ponds (Oren, 2015) and dominate the surface part of the microbial mats of hypersaline (or other harsh) environments (Stal, 2000) – and the benthic diatom Nitzschia , a widespread genus living in freshwater and marine habitats all over the world, where it can accumulate in great numbers in undisturbed surface sediments (Kociolek et al ., 2015). Communities belonging to this diatom genus have also been described from more challenging conditions, such as geothermal (e.g., Owen et al ., 2008; Stavreva-Veselinovska and Todorovska, 2010) and hypersaline environments (e.g., DasSarma and DasSarma, 2017; Balakrishnan et al ., 2019) where they behave as extremophiles.…”

Section: Cervia Salt-pansmentioning

confidence: 99%

Early taphonomic processes in a microbial-based sedimentary system from a temperate salt-pan site (Cervia salterns, Italy)

Barbieri

Cavalazzi

2022

International Journal of Astrobiology

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In the only salt evaporation pond retaining its natural setting of the historic Salina di Cervia (Italy), the northernmost salterns of the Mediterranean area, a number of potentially preservable textures derive from the interactions between photosynthetic mat producers and the sedimentary substrate. These morphologies occur at the beginning of the taphonomic processes when repeated emerged-submerged conditions take place. In these conditions the cohesive nature of the diatom- and cyanobacterial-derived mucilage favours the stabilization of otherwise ephemeral structures. Surface micromorphologies for which diatoms and cyanobacteria have played some active role when still living in the soft microlayer and down to the sediment-water interface, such as during the gliding motility, can overcome the surface layer of most intense mixing (i.e., the taphonomically active zone) and keep traces of them in the fossil record either as body fossils or as texture contributors. Tiny microbial-derived remnants, such as filaments and biofilm strands of halotolerant microorganisms, while fragile upon their formation, can therefore stabilize as biosignatures when combined with salt precipitation. Halophilic and halotolerant ecosystems are models for life in extreme environments (analogue sites) with similarity to those strongly suspected to occur and/or have occurred on Mars and on other planetary bodies. The study of hypersaline systems such as Salina di Cervia which harbour diverse and abundant microbial life, can be relevant for astrobiology since it allows the investigation of potential biosignatures and their preservation, and of further understand the range of conditions and the planetary processes sustaining potentially habitable systems.

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Bacillariophyceae

Cited by 22 publications

References 225 publications

Identifying pre‐Hispanic water storages in agricultural areas of south‐central Andes through diatom evidence

Identifying pre‐Hispanic water storages in agricultural areas of south‐central Andes through diatom evidence

Profiling Analysis of Filter Feeder Polypedilum (Chironomidae) Gut Contents Using eDNA Metabarcoding Following Contrasting Habitat Types—Weir and Stream

Early taphonomic processes in a microbial-based sedimentary system from a temperate salt-pan site (Cervia salterns, Italy)

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