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88 results for “freshwater biodiversity”
FIGURE 1 in Eunotia (Bacillariophyta) biodiversity from high altitude, freshwater habitats in the Mugecuo Scenic Area, Sichuan Province, China
FIGURE 1. Location of Mugecuo Scenic Area. Distribution of sample collection sites are indicated by black dots.
FIGURES 2–18. E in Eunotia (Bacillariophyta) biodiversity from high altitude, freshwater habitats in the Mugecuo Scenic Area, Sichuan Province, China
FIGURES 2–18. E. mugecuo sp. nov.. 2–13. LM images; 6. Holotype; 14–18 SEM images; 14. External valve end; 15. External valve view; 16. Internal valve view; 17–18. Terminal ends of internal valve, arrow show a rimoportula. LM scale bars, 10 μm.
Data from: Choice of capture and extraction methods affect detection of freshwater biodiversity from environmental DNA
Environmental DNA (eDNA) is used to detect biodiversity by the capture, extraction, and identification of DNA shed to the environment. However, eDNA capture and extraction protocols vary widely across studies. This use of different protocols potentially biases detection results and could significantly hinder a reliable use of eDNA to detect biodiversity. We tested whether choice of eDNA capture and extraction protocols significantly influenced biodiversity detection in aquatic systems. We sampled lake and river water, captured and extracted eDNA using six combinations of different protocols with replication, and tested for the detection of four macroinvertebrate species. Additionally, using the same lake water technical replicates, we compared the effect of capture and extraction protocols on metabarcode detections of biodiversity using 16S for eubacteria and cytochrome c oxidase I (COI) for eukaryotes. Protocol combinations for capture and extraction of eDNA significantly influenced DNA yield and number of sequences obtained from next generation sequencing. We found significantly different detection rates of species ranging from zero percent to thirty-three percent. Differences in which protocol combinations produced the highest metabarcoded biodiversity were detected and demonstrate that different protocols are required for different biodiversity targets. Our results highlight that the choice of molecular protocols used for capture and extraction of eDNA from water can strongly affect biodiversity detection. Consideration of biases caused by choice of protocols should lead to a more consistent and reliable molecular workflow for repeatable and increased detection of biodiversity in aquatic communities.
Data from: Near-global freshwater-specific environmental variables for biodiversity analyses in 1km resolution
The lack of freshwater-specific environmental information at sufficiently fine spatial grain hampers broad-scale analyses in aquatic biology, biogeography, conservation, and ecology. Here we present a near-global, spatially continuous, and freshwater-specific set of environmental variables in a standardized 1 km grid. We delineate the sub-catchment for each grid cell along the HydroSHEDS river network and summarize the upstream climate, topography, land cover, surface geology and soil to each grid cell using various metrics (average, minimum, maximum, range, sum, inverse distance-weighted average and sum). All variables were subsequently averaged across single lakes and reservoirs of the Global lakes and Wetlands Database that are connected to the river network. Monthly climate variables were summarized into 19 long-term climatic variables following the 'bioclim' framework. This new set of variables provides a basis for spatial ecological and biodiversity analyses in freshwater ecosystems at near global extent, yet fine spatial grain. To facilitate the generation of freshwater variables for custom study areas and spatial grains, we provide the 'r.stream.watersheds' and 'r.stream.variables' add-ons for the GRASS GIS software.
Figure 4 in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 4. Potamonautes namuliensis sp. nov. male holotype, SAM A46796. A, left gonopod 1, anterior view; B, left gonopod 1 posterior view; C, left gonopod 2 anterior view. Scale bars = 10 mm.
Figure 3 in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 3. Potamonautes namuliensis sp. nov. Male holotype (carapace length = 21.55 mm) from Manho forest 1500 m a.s.l., Mount Namuli, Zambézia Province, central Mozambique SAM A46796. A, whole animal dorsal aspect; B, whole animal ventral aspect; C, cephalothorax, frontal aspect. Scale bars = 10 mm.
Figure 2. A Bayesian phylogram for the combined 12S in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 2. A Bayesian phylogram for the combined 12S rRNA + 16S rRNA + COI mtDNA sequence data. Statistical values above the nodes represent values for bootstrapping for maximum parsimony (MP). Values below each node represent the posterior probability (pP) values for the Bayesian analyses. Only bootstrap values> 70% and pP values> 0.95 are shown.
Figure 1. A in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 1. A map showing the three sample sites in central and northern Mozambique and the one sample site in southern Malawi where freshwater crabs were collected.
Figure 5 in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 5. Potamonautes mulanjeensis sp. nov. Male holotype (carapace length = 25.38 mm) Madzeka hut 1800 m a.s.l., Mount Mulanje (form B, Fig. 2), southern Malawi, SAM A46799. A, whole animal dorsal aspect; B, whole animal ventral aspect; C, cephalothorax, frontal aspect. Scale bars = 10 mm.
Figure 6 in Neglected refugia of biodiversity: mountainous regions in Mozambique and Malawi yield two novel freshwater crab species (Potamonautidae: Potamonautes)
Figure 6. Potamonautes mulanjeensis sp. nov. male holotype, SAM A46799. A, left gonopod 1, anterior view; B, left gonopod 1 posterior view. Scale bars = 10 mm.
Data from: Species turnover and invasion of dominant freshwater invertebrates alter biodiversity-ecosystem function relationship
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Data from: Choice of capture and extraction methods affect detection of freshwater biodiversity from environmental DNA
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Data from: Pleistocene speciation and glacial refugia in a temperate freshwater biodiversity hotspot
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Data from: Unlocking biodiversity and conservation studies in high‐diversity environments using environmental DNA (eDNA): a test with Guianese freshwater fishes
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Data from: Near-global freshwater-specific environmental variables for biodiversity analyses in 1km resolution
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Data from: A multigene molecular assessment of cryptic biodiversity in the iconic freshwater blackfishes (Teleostei: Percichthyidae: Gadopsis) of south-eastern Australia
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Data from: Spatial representativeness of environmental DNA metabarcoding signal for fish biodiversity assessment in a natural freshwater system
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Data from: The Hawaiian freshwater algae biodiversity survey (2009-2014): systematic and biogeographic trends with an emphasis on the macroalgae
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Data from: The origins of global biodiversity on land, sea, and freshwater
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Data from: Biodiversity and thermal ecological function: the influence of freshwater algal diversity on local thermal environments
The influence of temperature on diversity and ecosystem functioning is well studied; the converse however, i.e. how biodiversity influences temperature, much less so. We manipulated freshwater algal species diversity in microbial microcosms to uncover how diversity influenced primary production, which is well documented in biodiversity research. We then also explored how visible-spectrum absorbance and the local thermal environment responded to biodiversity change. Variations in the local thermal environment, that is, in the temperature of the immediate surroundings of a community, are known to matter not only for the rate of ecosystem processes, but also for persistence of species assemblages and the very relationship between biodiversity and ecosystem functioning. In our microcosm experiment, we found a significant positive association between algal species richness and primary production, a negative association between primary production and visible-spectrum absorbance, and a positive association between visible-spectrum absorbance and the response of the local thermal environment (i.e., change in thermal infrared emittance over a unit time). These findings support an indirect effect of algal diversity on the local thermal environment pointing to a hitherto unrecognized biodiversity effect in which diversity has a predictable influence on local thermal environments.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.