In situ effects of a microplastic mixture on the community structure of benthic macroinvertebrates in a freshwater pond

2021 ◽  
Author(s):  
Jelena Stanković ◽  
Djuradj Milošević ◽  
Boris Jovanović ◽  
Dimitrija Savić‐Zdravković ◽  
Ana Petrović ◽  
...  
Keyword(s):  
Community Structure ◽  
Benthic Macroinvertebrates ◽  
Freshwater Pond

In situ effects of titanium dioxide nanoparticles on community structure of freshwater benthic macroinvertebrates

2016 ◽  
Vol 213 ◽  
pp. 278-282 ◽  
Author(s):  
Boris Jovanović ◽  
Djuradj Milošević ◽  
Milica Stojković Piperac ◽  
Ana Savić
Keyword(s):  
Titanium Dioxide ◽  
Community Structure ◽  
Benthic Macroinvertebrates ◽  
Titanium Dioxide Nanoparticles

scholarly journals Metagenome-assembled genomes infer potential microbial metabolism in alkaline sulphidic tailings

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Wenjun Li ◽  
Xiaofang Li
Keyword(s):  
Community Structure ◽  
Mine Tailings ◽  
Fluorescent In Situ Hybridization ◽  
High Throughput Sequencing ◽  
Microbial Consortia ◽  
Metabolic Reconstruction ◽  
Metal Release ◽  
Community Members ◽  
Oxidative Stresses

Abstract Background Mine tailings are hostile environment. It has been well documented that several microbes can inhabit such environment, and metagenomic reconstruction has successfully pinpointed their activities and community structure in acidic tailings environments. We still know little about the microbial metabolic capacities of alkaline sulphidic environment where microbial processes are critically important for the revegetation. Microbial communities therein may not only provide soil functions, but also ameliorate the environment stresses for plants’ survival. Results In this study, we detected a considerable amount of viable bacterial and archaeal cells using fluorescent in situ hybridization in alkaline sulphidic tailings from Mt Isa, Queensland. By taking advantage of high-throughput sequencing and up-to-date metagenomic binning technology, we reconstructed the microbial community structure and potential coupled iron and nitrogen metabolism pathways in the tailings. Assembly of 10 metagenome-assembled genomes (MAGs), with 5 nearly complete, was achieved. From this, detailed insights into the community metabolic capabilities was derived. Dominant microbial species were seen to possess powerful resistance systems for osmotic, metal and oxidative stresses. Additionally, these community members had metabolic capabilities for sulphide oxidation, for causing increased salinity and metal release, and for leading to N depletion. Conclusions Here our results show that a considerable amount of microbial cells inhabit the mine tailings, who possess a variety of genes for stress response. Metabolic reconstruction infers that the microbial consortia may actively accelerate the sulphide weathering and N depletion therein.

scholarly journals Observing and modelling phytoplankton community structure in the North Sea

2017 ◽  
Vol 14 (6) ◽  
pp. 1419-1444 ◽  
Author(s):  
David A. Ford ◽  
Johan van der Molen ◽  
Kieran Hyder ◽  
John Bacon ◽  
Rosa Barciela ◽  
...  
Keyword(s):  
Community Structure ◽  
North Sea ◽  
Phytoplankton Community ◽  
Marine Biodiversity ◽  
Phytoplankton Community Structure ◽  
Pigment Analysis ◽  
The North ◽  
The North Sea ◽  
In Situ Observations

Abstract. Phytoplankton form the base of the marine food chain, and knowledge of phytoplankton community structure is fundamental when assessing marine biodiversity. Policy makers and other users require information on marine biodiversity and other aspects of the marine environment for the North Sea, a highly productive European shelf sea. This information must come from a combination of observations and models, but currently the coastal ocean is greatly under-sampled for phytoplankton data, and outputs of phytoplankton community structure from models are therefore not yet frequently validated. This study presents a novel set of in situ observations of phytoplankton community structure for the North Sea using accessory pigment analysis. The observations allow a good understanding of the patterns of surface phytoplankton biomass and community structure in the North Sea for the observed months of August 2010 and 2011. Two physical–biogeochemical ocean models, the biogeochemical components of which are different variants of the widely used European Regional Seas Ecosystem Model (ERSEM), were then validated against these and other observations. Both models were a good match for sea surface temperature observations, and a reasonable match for remotely sensed ocean colour observations. However, the two models displayed very different phytoplankton community structures, with one better matching the in situ observations than the other. Nonetheless, both models shared some similarities with the observations in terms of spatial features and inter-annual variability. An initial comparison of the formulations and parameterizations of the two models suggests that diversity between the parameter settings of model phytoplankton functional types, along with formulations which promote a greater sensitivity to changes in light and nutrients, is key to capturing the observed phytoplankton community structure. These findings will help inform future model development, which should be coupled with detailed validation studies, in order to help facilitate the wider application of marine biogeochemical modelling to user and policy needs.

scholarly journals High-resolution analysis of a North Sea phytoplankton community structure based on in situ flow cytometry observations and potential implication for remote sensing

2015 ◽  
Vol 12 (13) ◽  
pp. 4051-4066 ◽  
Author(s):  
M. Thyssen ◽  
S. Alvain ◽  
A. Lefèbvre ◽  
D. Dessailly ◽  
M. Rijkeboer ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Community Structure ◽  
North Sea ◽  
High Frequency ◽  
Phytoplankton Community ◽  
Phytoplankton Community Structure ◽  
The North ◽  
The North Sea ◽  
Daily Scale

Abstract. Phytoplankton observation in the ocean can be a challenge in oceanography. Accurate estimations of its biomass and dynamics will help to understand ocean ecosystems and refine global climate models. Relevant data sets of phytoplankton defined at a functional level and on a sub-meso- and daily scale are thus required. In order to achieve this, an automated, high-frequency, dedicated scanning flow cytometer (SFC, Cytobuoy b.v., the Netherlands) has been developed to cover the entire size range of phytoplankton cells whilst simultaneously taking pictures of the largest of them. This cytometer was directly connected to the water inlet of a PocketFerryBox during a cruise in the North Sea, 08–12 May 2011 (DYMAPHY project, INTERREG IV A "2 Seas"), in order to identify the phytoplankton community structure of near surface waters (6 m) with a high spatial resolution basis (2.2 ± 1.8 km). Ten groups of cells, distinguished on the basis of their optical pulse shapes, were described (abundance, size estimate, red fluorescence per unit volume). Abundances varied depending on the hydrological status of the traversed waters, reflecting different stages of the North Sea blooming period. Comparisons between several techniques analysing chlorophyll a and the scanning flow cytometer, using the integrated red fluorescence emitted by each counted cell, showed significant correlations. For the first time, the community structure observed from the automated flow cytometry data set was compared with PHYSAT reflectance anomalies over a daily scale. The number of matchups observed between the SFC automated high-frequency in situ sampling and remote sensing was found to be more than 2 times better than when using traditional water sampling strategies. Significant differences in the phytoplankton community structure within the 2 days for which matchups were available suggest that it is possible to label PHYSAT anomalies using automated flow cytometry to resolve not only dominant groups but also community structure.

Selected Aspects of Plant Taphonomic Processes in Coastal Deltaic Regimes

1986 ◽  
Vol 15 ◽  
pp. 27-44
Author(s):  
Robert A. Gastaldo
Keyword(s):  
Community Structure ◽  
Scientific Community ◽  
Depositional Environments ◽  
Terrestrial Vegetation ◽  
Coastal Systems ◽  
Stratigraphic Record ◽  
Ecological Habitats ◽  
Insight Into ◽  
Taphonomic Processes

Ancient coastal physiographic provinces have been sites of detrital plant accumulations since the advent of terrestrial vegetation in the Silurian. These lowlands contain remnants of vegetation from a diversity of ecological habitats in a variety of preservational modes and depositional environments. Deltaic regimes within these coastal systems have acted as principal locales for the preservation of in situ (autochthonous) and transported (hypoautochthonous/allochthonous) community elements. A vast majority of our understanding concerning plant diversity and community structure has been centered in the refugia of lowland deltas because of the propensity of these terrigenous sites to become part of the stratigraphic record either by autocyclic or allocyclic mechanisms. Deltaic systems have played a major role in the accumulation of hydrocarbons either as subaqueous (topogenous) and subaerial/aerial (ombrogenous) peats, to be subsequently metamorphosed to coal (McCabe, 1985), or precurssors to natural gas and petroleum (Durand et al., 1986). In certain instances, these peats have been subjected to permineralization and provide the scientific community with an insight into the original standing community biomass (Phillips et al. 1985). Where peats have been coalified, palynomorphs recovered from coal macerations provide information on trends in regional vegetation. Additionally, depending on the relative rates of clastic vs. organic sedimentation in these environments, deltas have acted as repositories for coalified compression and authigenically cemented megafloral and microfloral assemblages (taphocoenoses).

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