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98 results for “freshwater communities”
Microbial Observatory at North Temperate Lakes LTER High-resolution temporal and spatial dynamics of microbial community structure in freshwater bog lakes 2005 - 2009 original format (Reformatted to the ecocomDP Design Pattern)
This data package is formatted as an ecocomDP (Ecological Community Data Pattern). For more information on ecocomDP see https://github.com/EDIorg/ecocomDP. This Level 1 data package was derived from the Level 0 data package found here: https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/349/4. The abstract below was extracted from the Level 0 data package and is included for context: The North Temperate Lakes - Microbial Observatory seeks to study freshwater microbes over long time scales (10+ years). Observing microbial communities over multiple years using DNA sequencing allows in-depth assessment of diversity, variability, gene content, and seasonal/annual drivers of community composition. Combining information obtained from DNA sequencing with additional experiments, such as investigating the biochemical properties of specific compounds, gene expression, or nutrient concentrations, provides insight into the functions of microbial taxa. Our 16S rRNA gene amplicon datasets were collected from bog lakes in Vilas County, WI, and from Lake Mendota in Madison, WI. Ribosomal RNA gene amplicon sequencing of freshwater environmental DNA was performed on samples from Crystal Bog, North Sparkling Bog, West Sparkling Bog, Trout Bog, South Sparkling Bog, Hell’s Kitchen, and Mary Lake. These microbial time series are valuable both for microbial ecologists seeking to understand the properties of microbial communities and for ecologists seeking to better understand how microbes contribute to ecosystem functioning in freshwater.
Microbial Observatory at North Temperate Lakes LTER High-resolution temporal and spatial dynamics of microbial community structure in freshwater bog lakes 2005 - 2009 original format
The North Temperate Lakes - Microbial Observatory seeks to study freshwater microbes over long time scales (10+ years). Observing microbial communities over multiple years using DNA sequencing allows in-depth assessment of diversity, variability, gene content, and seasonal/annual drivers of community composition. Combining information obtained from DNA sequencing with additional experiments, such as investigating the biochemical properties of specific compounds, gene expression, or nutrient concentrations, provides insight into the functions of microbial taxa. Our 16S rRNA gene amplicon datasets were collected from bog lakes in Vilas County, WI, and from Lake Mendota in Madison, WI. Ribosomal RNA gene amplicon sequencing of freshwater environmental DNA was performed on samples from Crystal Bog, North Sparkling Bog, West Sparkling Bog, Trout Bog, South Sparkling Bog, Hell’s Kitchen, and Mary Lake. These microbial time series are valuable both for microbial ecologists seeking to understand the properties of microbial communities and for ecologists seeking to better understand how microbes contribute to ecosystem functioning in freshwater.
Microbial Observatory at North Temperate Lakes LTER High-resolution temporal and spatial dynamics of microbial community structure in freshwater bog lakes 2005 - 2009 original format (Reformatted to a Darwin Core Archive)
This data package is formatted as a Darwin Core Archive (DwC-A, event core). For more information on Darwin Core see https://www.tdwg.org/standards/dwc/. This Level 2 data package was derived from the Level 1 data package found here: https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/344/6, which was derived from the Level 0 data package found here: https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/349/4. The abstract below was extracted from the Level 0 data package and is included for context: The North Temperate Lakes - Microbial Observatory seeks to study freshwater microbes over long time scales (10+ years). Observing microbial communities over multiple years using DNA sequencing allows in-depth assessment of diversity, variability, gene content, and seasonal/annual drivers of community composition. Combining information obtained from DNA sequencing with additional experiments, such as investigating the biochemical properties of specific compounds, gene expression, or nutrient concentrations, provides insight into the functions of microbial taxa. Our 16S rRNA gene amplicon datasets were collected from bog lakes in Vilas County, WI, and from Lake Mendota in Madison, WI. Ribosomal RNA gene amplicon sequencing of freshwater environmental DNA was performed on samples from Crystal Bog, North Sparkling Bog, West Sparkling Bog, Trout Bog, South Sparkling Bog, Hell’s Kitchen, and Mary Lake. These microbial time series are valuable both for microbial ecologists seeking to understand the properties of microbial communities and for ecologists seeking to better understand how microbes contribute to ecosystem functioning in freshwater.
Data supporting: Combined stress of an insecticide and heatwaves or elevated temperature induce community and food web effects in a Mediterranean freshwater ecosystem
<p>Data used to obtain the results of the research paper entitled: "Combined stress of an insecticide and heatwaves or elevated temperature induce community and food web effects in a Mediterranean freshwater ecosystem", published in the journal "Water Research". The data derives from an outdoor (meso-) cosm experiment in Spain (Imdea Water, Alcala de Henares) in which the transportable temperature and heatwave control device (TENTACLE) was used to investigate the multiple stressors effects of two different climate change scenarios related to temperature (i.e., elevated temperature and reoccurring heatwaves) in combination with the neonicotinoid insecticide imidacloprid.</p>
Effects of freshwater salinization on a salt-naïve planktonic eukaryote community
Salinization of freshwater ecosystems is a widespread issue, but evidence of ecological effects on aquatic eukaryote communities remains scarce. We experimentally exposed naive planktonic communities of a north-temperate, freshwater lake to a gradient of chloride (Cl-) concentration (0.27-1400 mg Cl-.L-1) with in-situ mesocosms. Following six weeks of exposure, we measured changes in the diversity, composition, and abundance of eukaryotic 18S rRNA gene. Total phytoplankton biomass remained unchanged, but we observed a shift in dominant phytoplankton groups with elevated salt concentration, from Cryptophyta and Chlorophyta that dominated in lower chloride concentrations (<185 mg Cl-.L-1) to Ochrophyta that dominated at higher conductivity (>185 mg Cl-.L-1). Most zooplankton and rotifer taxa were sensitive to the salinity and disappeared at low chloride concentrations (<40 mg Cl-.L-1). While ciliates thrived at low chloride concentrations (<185 mg Cl-.L-1), fungal groups dominated at intermediate chloride concentrations (185 mg Cl-.L-1 to 640 mg Cl-.L-1), and only phytoplankton remained at the highest chloride concentrations (> 640 mg Cl-.L-1).
Manipulating the hydroperiod affects plant and invertebrate communities in freshwater mesocosms, La Marque TX USA, 2019-2021
We used a mesocosm experiment with six flooding depths and seven drought durations, followed by seven months of recovery, to explore how freshwater wetlands typical of the Houston, Texas area would respond to different hydrological regimes that might occur if wetlands were drained in anticipation of a heavy rain that did not materialize, leading to a temporary period of little or no standing water. The experiment was conducted in 2019-2021. How quickly mesocosms dried out was a function of initial water depth, with mesocosms initially set with greater water depths (30 cm) taking on average 38 days to dry out. Individual plant species (14 were planted; 8 were common at the end of the recovery period) were affected drought length, flooding depth, or their interaction, with results varying among species. The composition of the plant community at the end of the drought period was strongly affected by drought length, and this effect persisted through seven months of recovery, with the 80- and 160-day drought treatments diverging most strongly from shorter drought treatments. Densities of mosquito larvae, snails and tadpoles were temporally variable, and affected more during the treatment period than after seven months of recovery. Our results indicate that managed wetlands in southeast Texas would be quite resilient to dry periods of up to 40 days in duration, especially if water was not completely drained at the beginning of the drought. In addition, some wetland species would persist in managed wetlands even if they experienced droughts of up to 160 days.
Compiled long-term community composition datasets of primary producers and consumers in both freshwater and terrestrial communities
This data package consists of two files to study long-term changes in communities across a range of systems (freshwater and terrestrial) and organism types (from short-lived (sub annual) to long-lived species) that are both primary producers and consumers. We compiled many datasets from publicly available archives (41 datasets are from 14 LTER sites). All datasets must have had a measure of species level abundance to calculate more derived community ecological metrics beyond species richness. These data can be used to study community dynamics over space and time.
Plant community compositional stability over 40 years in a Fraser River Estuary tidal freshwater marsh
<p class="MsoNormal"><span>Long-term data sets documenting temporal changes in vegetation communities are uncommon, yet imperative for understanding trends and triggering potential conservation management interventions. For example, decreasing species diversity and increasing non-native species abundance may be indicative of decreasing community stability. We explored long-term plant community change over a 40-year period through the contribution of data collected in 2019 to two historical datasets collected in 1979 and 1999 to evaluate decadal changes in plant community biodiversity in a tidal freshwater marsh in the Fraser River Estuary in British Columbia, Canada. We found that plant assemblages were characterized by similar indicator species, but most other indicator species changed, and that overall </span><span>α-diversity</span><span> decreased while </span><span>β</span><span>-diversity increased. Further, we found evidence for plant assemblage homogenization through the increased abundance of invasive species such as yellow flag iris (<em>Iris pseudacorus</em>), and reed canary grass (<em>Phalaris arundinacea</em>). These observations may inform concepts of habitat stability in the absence of direct anthropogenic disturbance and corroborate globally observed trends of native species loss and non-native species encroachment. Our results indicate that within the Fraser River Estuary, active threat management may be necessary in areas of conservation concern in order to prevent further native species biodiversity loss. </span></p>
Fig. 2 in New Geographic Record Of Myxobolus portulacalensis (Saraiva & Molnar, 1990) And Spinitectus Inermis (Zeder, 1800) In European Eel (Anguilla Anguilla) Parasite Communities From Latvia Freshwaters
Fig. 2. Male Spinitectus inermis (Zeder, 1800) body from stomach of European eel (Anguilla anguilla) caught in Lake Usma, Latvia (100 x magnification). A - anterior end; B – posterior end.
Fig. 1 in New Geographic Record Of Myxobolus portulacalensis (Saraiva & Molnar, 1990) And Spinitectus Inermis (Zeder, 1800) In European Eel (Anguilla Anguilla) Parasite Communities From Latvia Freshwaters
Fig. 1. Spores of Myxobolus portucalensis (Saraiva and Molnar, 1990) from fins of European eel (Anguilla anguilla) caught in Lake Usma, Latvia (600 x magnification).
Figure 24 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 24. Distribution of each epibiont species (mean densities) along the anterioposterior axis of Caridina ensifera. Anatomical units are considered individually. per, pereiopod; ple, pleopod; uro, uropod.
Figure 21 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 21. Dendrogram of the Hierarchical Cluster Analysis (anatomical units) performed using the mean densities of epibionts on the different anatomical units of the shrimps analysed (metric distance: City Block (Manhattan); method: Ward).
Figure 2 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 2. The epibiont species. (a) Acineta sulawesiensis; (b) Podophrya maupasi; (c) Spelaeophrya polypoides; (d) Zoothamnium intermedium; (e) Vorticella globosa; (f) Cothurnia compressa; (g) Amphileptus fusidens; (h) Embata laticeps; (i) Embata laticeps, the trophi. bd, basal disc; bl, basal lorica; c, cloaca; cv, contractile vacuole; l, lorica; ma, macronucleus; mi, micronucleus; my, myoneme; r, rostrum; s, stalk; st, stomach; t, tentacles; td, trochal discs; to, toes; v, vitellarium.
Figures 11–19 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figures 11–19. (11) Zoothamnium intermedium, area of stalk confluence for attachment to the shrimp surface (silver carbonate, ×400). (12) Vorticella globosa, a specimen with the contracted stalk (silver carbonate, ×710). (13) Cothurnia compressa, individual showing the lorica (silver carbonate, ×820). (14) Amphileptus fusidens, the body shape and the arrangement of the kineties (silver carbonate, ×770). (15–19) Embata laticeps: (15) the entire individual showing the trochal discs, rostrum, and toes (methyl green, ×200); (16) the anterior area of the body with the trochal discs and the rostrum (methyl green, ×410); (17) detail of the rostrum (methyl green, ×410); (18, 19) the trophi of the mastax, showing the unci and the teeth (×520).
Figure 20 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 20. Two first principal components of the Principal Component Analysis performed using the mean density of epibionts on each anatomical unit of the different shrimps analysed.
Figure 23 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 23. Distribution of each epibiont species (mean densities) and total mean density of epibionts, along the anterioposterior axis of Caridina ensifera. Anatomical units are considered in five groups.
Figures 3–10 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figures 3–10. (3, 4) Acineta sulawesiensis (silver carbonate, ×1070): (3) the macronucleus and the anterior prolongation of the lorica; (4) the actinophores with the tentacles. (5) Podophrya maupasi (methyl green, ×792). (6–9) Spelaeophrya polypoides: (6) individual showing the basal disc, the tentacles and the pore of the contractile vacuole (arrow) (SEM, ×280); (7) several specimens in their location on the basibiont surface (SEM, ×230); (8) a specimen showing the elongate macronucleus (silver carbonate, ×450); (9) the macronucleus irregular and the inferior part articulate of the body (silver carbonate, ×360). (10) Zoothamnium intermedium, a colony showing the stalk and the shape of the zooids (silver carbonate, ×420).
Figure 22 in Epibiontic communities on the freshwater shrimp Caridina ensifera (Crustacea, Decapoda, Atyidae) from Lake Poso (Sulawesi, Indonesia)
Figure 22. Dendrogram of the Hierarchical Cluster Analysis (epibiont species) performed using the mean densities of epibionts on the different anatomical units of the shrimps analysed (metric distance: City Block (Manhattan); method: Ward).
Data from: Predicting heat mortality in freshwater communities: temperature and oxygen effects
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Timing of salinisation and nutrient enrichment drives freshwater microbial community metabolic responses
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