Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
517
datasets available to search
ShareScore release 0.9.0
Dataset results
517 results for “Floodplain”
FIGURES 24–31 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURES 24–31. Actinella hermes-moreirae sp. nov. from type material, Mutum Island, SEM. 24. External view of valve. Scale bar = 5 μm. 25-26. Internal view of the valve. Scale bar = 5 μm. 27. Girdle view of the valve. Scale bar = 5 μm. 28. Aspect of the distal raphe end on headpole. Scale bar = 2 μm. 29-30. Headpole and footpole in internal view showing the rimoportula (arrow) and helictoglossa. Scale bar = 2 μm. 31. 29. Headpole in girdle view, showing the raphe on the mantle (arrow). Scale bar = 2 μm.
FIGURE 52–55 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURE 52–55. Gomphonema mutunensis sp. nov. from type material, Mutum Island, SEM. 52. Girgle view. Scale bar = 10 μm. 53. Aspect of striae and areola shape. Scale bar = 2 μm. 54. Footpole in external view showing the pore field (arrow). 55. Headpole in external view. Scale bar = 1 μm.
FIGURE 48–51 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURE 48–51. Gomphonema mutunensis sp. nov. from type material, Mutum Island, SEM. 48-51. Internal and external view of valve, respectively. Scale bar = 10 μm. 50. Internal view of axial area. 51. External view of axial area showing the central stigma (arrow). Scale bar = 2 μm.
Supporting Dataset for the study "Influence of Floodplains and Groundwater Dynamics on the Present-Day Climate simulated by the CNRM Model"
<p>This archive contains the data used in the study "Influence of Floodplains and Groundwater Dynamics on the Present-Day Climate simulated by the CNRM Model" submitted to <a href="https://www.earth-system-dynamics.net/">Earth System Dynamics</a>.</p> <p> </p>
Data from: Epigenetic variation reflects dynamic habitat conditions in a rare floodplain herb
Variation of DNA-methylation is thought to play an important role for rapid adjustments of plant populations to dynamic environmental conditions, thus compensating for the relatively slow response time of genetic adaptations. However, genetic and epigenetic variation of wild plant populations has not yet been directly compared in fast changing environments. Here we surveyed populations of Viola elatior from two adjacent habitat types along a successional gradient characterized by strong differences in light availability. Using AFLP and MSAP analyses we found relatively low levels of genetic (H'gen=0.19) and epigenetic (H'epi=0.23) diversity and high genetic (ϕST=0.72) and epigenetic (ϕST=0.51) population differentiation. Diversity and, respectively, differentiation were significantly correlated, suggesting that epigenetic variation partly depends on the same driving forces as genetic variation. Correlation based genome scans detected comparable levels of genetic (17.0%) and epigenetic (14.2%) outlier markers associated with site specific light availability. However, as revealed by separate differentiation based genome scans for AFLP, only few genetic markers seemed to be actually under positive selection (0-4.5%). Moreover, PCoA and Mantel tests showed that overall epigenetic variation was more closely related to habitat conditions, indicating that environmentally-induced methylation changes may lead to convergence of populations experiencing similar habitat conditions and may thus play a major role for the transient and/or heritable adjustment to changing environments. Additionally, using a new MSAP scoring approach, we found that mainly the unmethylated (ϕST=0.60) and CG-methylated states (ϕST=0.46) of epiloci contributed to population differentiation and putative habitat related adaptation, whereas CHG-hemimethylated states (ϕST=0.21) only played a marginal role.
Data from: Developing state and transition models of floodplain vegetation dynamics as a tool for conservation decision-making: a case study of the Macquarie Marshes Ramsar wetland
1. Floodplain vegetation states (communities) exhibit spatiotemporal dynamics in vegetation structure and composition, which reflect unique hydrological and connectivity patterns. Shifts in inundation regimes can drive succession and establish new stable states, determined by the magnitude and duration of the hydrological perturbation. 2. We aimed to develop a modelling approach that is able to capture ecosystem dynamics, identify and quantify the main drivers of change, and provide a tool for conservation decision-making. We developed state and transition models for floodplain vegetation states based on surveys in 1991 and 2008 in the Macquarie Marshes (Australia), a Ramsar wetland of international importance. We used a Bayesian logistic regression approach to model state and transitions between vegetation states and investigated how flood frequency, distance to stream and fire frequency were associated with vegetation dynamics during this period. 3. During 1991–2008, significant transitions have occurred towards drier states. Semi-permanent wetland vegetation had the lowest persistence probability (ppsis = 0·456) and a significant threshold response of transitioning to terrestrial vegetation (ptran = 0·505). Transition to drier states was driven by lower inundation probabilities followed by increased fire probability, and distance to nearest stream. 4. Using developed models, we predicted persistence probabilities of vegetation states under an unregulated (i.e. no dams or diversions) and regulated water availability system. Under a regulated system, semi-permanent wetland vegetation had an average persistence of ppsis = 0. 67 and 0·08 in the northern and southern sections of the nature reserve, respectively. Under an unregulated system, the predicted persistence of semi-permanent wetland vegetation was considerably higher: ppsis = 0·87 and 0·38, respectively. 5. Synthesis and applications. Developing quantitative models of state transitions significantly improved our understanding of ecosystem dynamics, identifying sensitive indicators for monitoring and thus supporting conservation decision-making. This helps managers understand potential trajectories of change in ecosystems in response to management options. For example, increasing environmental flows in the Macquarie Marshes is predicted to shift the community towards more of a wetland than the terrestrial state, resulting from river regulation. State and transition models identified how key ecological assets respond to drivers of change, particularly where these can be managed. This is critical for ensuring that all ecosystem components are managed and that these do not shift into undesirable states.
Habitat alteration facilitates the dominance of invasive species through disrupting niche partitioning in floodplain wetlands
<p>Aim: Exotic species invasion often leads to declines in local and regional biodiversity, particularly in freshwater ecosystems. This biodiversity loss is generally facilitated by human activities such as land cover change and hydrological alternation. Recent advances in stable isotope analysis (SIA) have been highlighted in many studies addressing fundamental issues in invasion ecology, especially in quantifying competition for resources between native and exotic species. However, how anthropogenic disturbance influences trophic relationships among invasive and native species remains poorly understood.</p> <p>Location: Middle-lower Yangtze River region, China</p> <p>Methods: To investigate the effects of human disturbance on interspecific trophic interactions, this study compared isotopic niche space and overlap of the introduced red swamp crayfish (Procambarus clarkii) and the native oriental river shrimp (Macrobrachium nipponense) and freshwater snail (Bellamya aeruginosa) in natural and modified wetlands.</p> <p>Results: Based on carbon and nitrogen SIA, we found ubiquitous niche shifts in macroinvertebrates with increased competition, which might lead to significant niche contraction in modified habitats at both community and population scales. Moreover, the isotopic niche width of the exotic crayfish was twice as larger as that of natives at both habitats, suggesting that the exotic P. clarkii had great competitive superiority over the native species. However, the effects of habitat modification on niche overlap were inconsistent. While the niche overlap between crayfish and shrimp was significantly higher in modified habitats than in natural open waters, niche overlap between crayfish and the snail was significantly reduced.</p> <p>Main conclusions: Collectively, our findings highlight that the competitive outcomes of interspecific trophic interactions can be dependent on the prey availability and diversity, which embraces both the classic optimal foraging theory and competition theory to understand how environmental change, such as habitat alternation, affects the biological invasion processes.</p>
FIGURE 4 in Free-living Platyhelminthes of the Pacaya-Samiria National Reserve, a Peruvian Amazon floodplain
FIGURE 4. Microphotograps of live triclads. a: Girardia cf. tigrina, b: Phagocata sp. Photographed by Daniel H. Shain.
FIGURE 3 in Free-living Platyhelminthes of the Pacaya-Samiria National Reserve, a Peruvian Amazon floodplain
FIGURE 3. Dorsal view of live specimens. a: Bothromesostoma evelinae. b: Mesostoma ehrenbergi. c: Olisthanella truncula. d: Gyratrix hermaphroditus. Scale bars a–c: 200 µm, scale bar d: 100 µm.
FIGURE 2 in Free-living Platyhelminthes of the Pacaya-Samiria National Reserve, a Peruvian Amazon floodplain
FIGURE 2. Microphotographs of Temnocephala lutzi. a: whole mount, scale bar 400 µm, b: detail of the stylet, scale bar 100 µm.
FIGURE 1 in Free-living Platyhelminthes of the Pacaya-Samiria National Reserve, a Peruvian Amazon floodplain
FIGURE 1. Air photograph from the research area. The white spots are the sampled sites (numbers correspond to the sampling localities mentioned in the Material & Methods).
The beautiful and the dammed: defining multi-stressor disturbance regimes in an Atlantic river floodplain wetland
<p>Natural hydrological fluctuations within river floodplains generate habitat diversity through variable connections between habitat patches and the main river channel. Human modification of floodplains can alter the magnitude and frequency of large floods and associated sediment movement by interrupting these floodplain connections. The lower Wolastoq | Saint John River and its associated floodplain wetlands are experiencing anthropogenic disturbances arising from climate change, increased urbanization in the watershed, changing upstream agricultural landscape practices, and, most notably, major road and dam construction. By comparing digitized aerial images, we identified key periods of change in wetland extent throughout an ecologically significant component of the floodplain, the Grand Lake Meadows and Portobello Creek wetland complex, with significant erosion evident in coves and backwater areas across the landscape following dam construction and significant accretion around the Jemseg River following highway construction. Connectivity and hydrological regime also influenced other habitat components, namely nutrients and metals retention, as well as the composition of the local macrophyte community. These findings address two key aspects of floodplain management: (1) understanding how hydrological alteration has historically influenced floodplain wetlands can inform us of how the ecosystem may respond under future conditions, such as climate change, and (2) the mechanisms by which habitat diversity and disturbance regimes filter biological communities, with the potential for patches to host a rich biodiversity continuously supporting critical ecosystem functions.</p>
Why forest fails to recover after repeated wildfires in Amazonian floodplains? Experimental evidence on tree recruitment limitation
<p>Amazonian floodplain forests are particularly vulnerable to wildfires that spread during extreme droughts, causing large scale forest dieback. After a second wildfire, these forests persist trapped with low tree cover and empty seed banks, yet the mechanisms that could explain this arrested succession remain unknown. Here we use a four-year field experiment to test whether tree recruitment failures in burnt floodplain forests are caused by environmental filtering, limiting early seedling emergence and establishment. We sowed seeds and planted seedlings of six floodplain trees with contrasting life strategies, and tested the roles of environmental filters by comparing tree seedling performances under different habitats (i.e. unburned forest, forest edge with burnt site, forest burnt once and forest burnt twice), and by manipulating soil root mats and herbaceous cover. Our results show that seedling emergence was around 15 % across all habitats. In general, seedlings performed best in burnt forests. Seedling growth was highest in forests burnt once, possibly because of high nutrient availability after fire. In forests burnt twice, tree seedlings grew relatively less, as nutrients become limiting due to flood erosion; yet, seedlings survived longer, possibly because of lower competition with sparse, naturally recruiting trees. We found similar patterns for seedlings that emerged in the field from sowed seeds. Synthesis: Our experimental evidence suggests that environmental filtering related to soil nutrient limitations may slow down forest recovery after repeated wildfires. Yet, our findings showing that floodplain trees are able to germinate from seeds and establish successfully in twice burnt forests suggest that seed limitation may be the reason why forest recovery fails persistently. A corollary to the problem is that repeatedly burnt forests seem to be trapped by a self-reinforcing feedback, in which low tree cover reduces seed dispersal and consequently seed availability, keeping tree cover low. Overall, our findings indicate that active restoration initiatives based on seeding native tree species may help accelerating the recovery of degraded floodplain forests after repeated wildfires.</p>
Figure 2 in Seasonal and diel variation of shrimp (Crustacea, Decapoda) on sandbanks of a tropical floodplain river
Figure 2. Seasonal variation of mean number of sergestid (empty bars) and palaemonid (filled bars) shrimp in diurnal (A) and nocturnal (B) samples from sandbanks of the Cinaruco River during 1999 (mean + SE). n= 7, except in November when only six sandbanks were sampled. No samples were taken during January or from July to October. A smoothed hydrograph of the Cinaruco River is superimposed to show water level variation during 1999.
Figure 4 in Seasonal and diel variation of shrimp (Crustacea, Decapoda) on sandbanks of a tropical floodplain river
Figure 4. Abundance (mean + SE) of Acetes paraguayensis and palaemonids during day and night for variable levels of submerged vegetation (A) and ridge-and-trough topography (B). Absent, moderate and abundant submerged vegetation and ridge-and-trough topography in the sandbanks are represented by black, light grey and dark grey bars, respectively. Plots were generated by pooling all sampling dates and sandbanks.
Figure 3 in Seasonal and diel variation of shrimp (Crustacea, Decapoda) on sandbanks of a tropical floodplain river
Figure 3. Abundance (mean + SE) of Acetes paraguayensis (empty bars) and palaemonids (filled bars) from sandbanks of the Cinaruco River during 1999 (pooling all sampling dates together) n = 7, except sandbank 3 (sampled only six times).
Figure 1 in Seasonal and diel variation of shrimp (Crustacea, Decapoda) on sandbanks of a tropical floodplain river
Figure 1. Locations of sampling sites on Cinaruco River near Laguna Larga (LL). Sampled sandbanks are shown with codes from S1 to S7. This NASA LandSat image was taken during the dry season of 2000.
FIGURE 5 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 5. Nucleotide divergences of the cyanobacteria 16S rRNA gene sequences (datasets used in Table 2) based on corrected pairwise genetic distance (p-distance), including Pseudoaliinostoc. Genetic distances between each paired sequence were calculated by Kimura 2-parameter model, where a total of 30 cyanobacteria species (30 sequences) were compared. Bar heights indicate % p-distance measured for intra-genera [e.g., Pseudoaliinostoc (Ps), Aliinostoc (Al), 5 genera of Aliinostoc relatives, including Anabaenopsis (An), Cyanospira (Cy), Halotia (Ha), Kryptousia (Kr), and Nodularia (No)] and inter-genera [e.g., PA vs. Al and between sister genera, including Kr vs. Tolypothrix (To), Ha vs. To, Kr vs. Ha, Cy vs. No, Cy vs. No, No vs. An, and Cy vs. An]. The values are shown as mean ±SD (Standard Deviation). Statistical analysis showed that the 16S rRNA gene divergence were significantly higher in Ps vs. Al than that calculated between tested sister genera (t-test, ** P <0.01, N = 26).
FIGURE 4. Secondary structures for the D1–D1 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 4. Secondary structures for the D1–D1ʹ and Box-B in conserved regions of the 16S–23S ITS. (A, H) Aliinostoc morphoplasticum; (B, I) A. magnakinetifex; (C, J) A. catenatum; (D) Pseudoaliinostoc soli; (E) P. tiwarii; (F, K) P. constrictum; (G, L) P. sejongens.
FIGURE 3 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 3. Alignment of the 16S–23S rRNA internal transcribed spacer (ITS) region from Nostoc sp., Aliinostoc morphoplasticum, and Pseudoaliinostoc sejongens. Different conserved domains (D1–D5), tRNA genes, major variable stems V2 and V3, and antiterminator (Box- B and Box-A) are indicated by boxes and names. Nostoc and P. sejongens contain both tRNAIle and tRNAAla, whereas A. morphoplasticum does not have tRNAIle. All compared sequences contain important structural elements of the ITS as described by Boyer et al. (2001).
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.