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.
84
datasets available to search
ShareScore release 0.9.0
Dataset results
84 results for “Freshwater ecosystems”
The Salinity and phosphorus mesocosm experiment in freshwater sawgrass wetlands: Determining the trajectory and capacity of freshwater wetland ecosystems to recover carbon losses from saltwater intrusion (FCE LTER), Florida, USA from 2015 to 2018
In experimental wetland mesocosms located at Florida Bay Interagency Science Center, Key Largo, Florida, researchers continuously added salinity (approximately 6.9 g salt d-1) and phosphorus ( approximately 0.5 mg P d-1) to Cladium jamaicense peat monoliths from February 2015 to February 2017 and quantified changes in carbon partitioning. Several studies, focusing on the functional roles of marsh, soil, periphyton and microbe in the sawgrass-peat ecosystem, summarized detailed methodology and results (Wilson et al. 2019; Servais et al. 2019; Mazzei et al. in press). Briefly, salinity was increased (~10 ppt) and phosphorus was added (0.45 mg P d-1) to simulate four treatment effects (n = 24 plots): i) freshwater and no-added phosphorus, ii) freshwater and added phosphorus, iii) saltwater and no-added phosphorus, and iv) saltwater and added phosphorus. Upon the termination of manipulation study (early February 2017), containers holding water and peat-sawgrass cores were drained, rinsed, and refilled with only freshwater without any added nutrient and salt. Then, we experimentally restored freshwater to previous treatment and control mesocosms from February 2017 to June 2018 to examine the capacity of wetland ecosystems to recover carbon losses from saltwater intrusion. Note that FCE1226_Water_quality.csv summarizes water quality during both the manipulation and restoration study; however, all other files in the Dataset Title section only summarize results from the restoration study. Detailed methodology is provided below.
Parasitism dramatically alters the ecosystem services provided by freshwater mussels
<p>Parasites can indirectly affect ecosystem function by altering host phenotype, but the trait-mediated impacts of parasitism at an ecosystem level remain poorly characterised. However, understanding the influence of parasites is central to understanding the ecosystem services provided by host species, especially in an era of global environmental change.</p> <p>We examined the effect of native (the trematode <em>Rhipidocotyle campanula</em>) and invasive (the bitterling fish <em>Rhodeus amarus</em>) parasites, and their interaction, on the clearance rates of unionid mussels, a dominant ecosystem-engineering group that modifies freshwater ecosystems worldwide. We used a combination of field experiments, laboratory experiments, and ecological simulations to demonstrate the phenotypic impact of parasites on the functional response of two mussel species across an environmental gradient (suspended particle concentration), and extended this with host and parasite community data to demonstrate the consequences for a real-world ecosystem, the Old West River in Cambridgeshire, England.</p> <p>Both parasites altered the clearance rates of their hosts but in contrasting fashion: while <em>R. campanula</em> increased host clearance rates relative to uninfected conspecifics under all conditions, <em>R. amarus</em> suppressed clearance rates at high suspended particle concentrations (eutrophic conditions) but elevated them otherwise. The parasites displayed different infection patterns in the two host species, and the invasive <em>R. amarus</em> rarely co-infects mussels with <em>R. campanula</em>.</p> <p>Given their disparate effects, the parasites' distributions reversed the relative filtration capacity of the two host species under high vs. low concentrations of suspended particles, demonstrating how differences between the infection patterns of native and invasive parasites, as well as their individual effects, need to be considered. Overall, the proportion of daily river discharge filtered by the combined mussel community changed by up to 96% in the presence of parasites. By incorporating multiple host species and multiple parasite species, we provide ecologically relevant evidence for the trait-mediated effects of parasites on ecosystem processes.</p> <p>Our study demonstrates that parasitism can significantly alter wider ecosystem processes by changing the phenotype of their host. Future work on ecosystem function should take parasitism into account, and consider both trait-mediated and density-mediated effects.</p>
History of the Giraffe Pipe locality inferred from microfossil remains: A thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
<p>How will freshwater lakes in the Arctic respond to climate change, especially if polar amplification results in even greater warming at these northern latitudes? Deep-time analogs offer opportunities to understand the potential impacts of future climate warming on Arctic environments. The Giraffe Pipe fossil locality located in the Northwest Territories of Canada offers a window into the life of a thriving Arctic freshwater ecosystem in the Eocene under greenhouse conditions. The remains of an extensive deposit of microfossils, including photosynthetic protists (chrysophytes, diatoms and green algae), heterotrophic protists (euglyphids, heliozoans, paraphysomonads, and rotosphaerids), and sponges, were used to reconstruct the history of the ancient water body. The concentrations and diversity of chrysophyte taxa were extensive throughout the core, accounting for over 70 % of the microfossil remains. The ratio of chrysophyte cysts to diatom valves, with a mean value near 14 throughout the core, further emphasized the dominance of the chrysophytes, and given the high diversity of taxa the locality represents a "paleo-hotspot" for this eukaryote lineage. Based on the totality of fossil evidence, the waterbody within the Giraffe Pipe crater represented a series of relatively shallow aquatic habitats, with changing physical and chemical conditions and varying water depths. Five major zones were identified, each found to be stable for an extended period of time, but with distinct transitions between successive zones signaling significant shifts in environmental conditions. The study provides valuable insight into how Arctic freshwater ecosystems responded to past warm climates, and to the organisms that could potentially thrive in these environments under future warming scenarios.</p>
Using eDNA for monitoring fish and invertebrate biodiversity in freshwater ecosystems
<p>Global biodiversity is facing an extinction crisis leading to increasing pressure on industries to monitor their potential environmental impact. Relatedly, there is demand for more efficient biodiversity monitoring methods, resulting in growing interest in the use of environmental DNA (eDNA). Many questions, however, regarding the reliability of this relatively novel method remain, particularly for non-specialist end-users of the technology.</p> <p>Here, the use of commercially available (in the UK) eDNA assays for monitoring freshwater fish and invertebrate biodiversity was compared to conventional surveillance techniques. Samples were collected from different habitats, on varying spatial scales and using multiple sampling regimes to assess how eDNA results were affected.</p> <p>For aquatic macroinvertebrates and fish, more taxa were detected by eDNA than conventional surveys conducted in parallel, and for fish, all taxa detected by conventional monitoring were confirmed by eDNA.</p> <p>For aquatic macroinvertebrates, several species were only detected through conventional methods, and the number of families detected by eDNA was lower than for conventional monitoring at all sites.</p> <p>eDNA results varied significantly between sampling locations within lentic sites and, for lotic sites, with the number of subsamples collected.</p> <p>In terms of practical implications, this study demonstrates the need for bespoke sampling protocols when collecting eDNA samples. This study improves understanding of using eDNA for detecting aquatic taxa that could inform species surveillance protocols. These are essential if eDNA is to be used by practitioners as a regulatory monitoring tool.</p>
Freshwater ecosystem transitions due to artisanal sand mining in Rwanda, Africa
<p>Artisanal small-scale mining (ASM) of sand, gravel and crushed stones plays an economically important role through its value as a ‘development mineral’ for a growing population in sub-saharan Africa. The extracted material is used in developing and expanding urban areas and infrastructure and provides income for the population involved in the sector. However, the extraction of aggregates has shown to have large and often complex ecological and socio-economical consequences with potential significant health effects on the miners and the environment in which the mining takes place. Furthermore, the extent in which these negative effects do arise from ASM in sub-Saharan still remains anecdotal and are largely unknown. Here we show that ASM in a river channel in central Rwanda causes a systemic shift in freshwater biodiversity by changing species assemblages from being riverine towards communities representing standing waters. Based on 101 point samples, we find that ponds created due to mining activities act as habitats for freshwater insects associated with wetland habitats. Furthermore, these mining ponds did also act as breeding sites for mosquitoes and thereby potentially increase the presence of vector borne diseases such as malaria. These findings show how ASM can generate a landscape level shift in freshwater biodiversity and introduces the apparent paradox that while aggregates are critical building blocks in mitigating malaria transmissions and prevalence through improved housing, the mining practices unwillingly can create new breeding ground for malaria mosquitos, thus increasing the risk of malaria spreading to nearby communities.</p>
Global heat map of probable importance of terrestrial ecosystems on meeting local demand of freshwater services
<p>This map (raster dataset, single layer) uses existing datasets to map globally “How important point x is likely to be for meeting the demand of a reliable & useable source of water on a scale of 0 to 1?” This relatively simple approach uses estimated water demand in a given basin as weight to identify pressure for flow regulation and water provisioning services. Precipitation and land cover estimates are then combined with it to give some insight into the hydrologic attributes of “location” and “timing” of flow that the ecosystems may influence. The underlying assumption here is that undisturbed ecosystems everywhere are performing the ecohydrological functions leading to freshwater services. The question is more (at the global scale): how dependent are the populations in the basin on the continued functioning of these services.</p> <p><strong>Input datasets:</strong></p> <ol> <li>Annual surface & groundwater (“blue”) water consumption estimates. URL: <a href="http://waterfootprint.org/en/resources/water-footprint-statistics/">http://waterfootprint.org/en/resources/water-footprint-statistics/</a></li> <li>HydroBasins watershed outline.</li> <li>European Space Agency (ESA) global land cover 2015.</li> <li>WorldClim annual average precipitation (Version 2.0).</li> </ol> <p><strong>Process:</strong></p> <p>Step 1: Calculate average annual water consumption estimates over HydroBasin outlines. This step spreads the demand laterally (in case of small basins) and upstream to the headwaters from (typically) downstream consumer concentration.</p> <p>Step 2: Normalize the demand globally and map the normalized values on to “natural” land cover classes from the land cover dataset [forests, grasslands, etc].</p> <p>Step 3: Normalize annual precipitation layer within basins on the scale 0-1 where 1 is the maximum annual precipitation in that basin. This is also mapped on the “natural” land cover. Precipitation is thus acting as ‘weight’ for importance within the basin. Example, upland headwaters will typically receive more rainfall and can be argued to be important for the flow regulation in the basin.</p> <p>Step 4: Combine the layers from 2 and 3.</p> <p><strong>Caveats:</strong></p> <ol> <li>Identification of what constitutes a “natural” land cover is not trivial, especially from global land cover maps. Example: Forests and plantations are hard to distinguish from these products.</li> <li>Improvement of quality of water is assumed to be implicit for functioning ecosystems.</li> </ol>
Figure 4 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 4. Variation of GSI for females and males of Atherina boyeri in the Hirfanlı Reservoir.
Figure 3 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 3. Length frequency of Atherina boyeri in the Hirfanlı Reservoir.
Figure 2 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 2. Age frequency of Atherina boyeri in the Hirfanlı Reservoir.
Figure 1 in The ichthyofaunal diversity of freshwater ecosystems in Gökçeada Island (NW Turkey) under the pressure of nonnative species
Figure 1. Map of Gökçeada Island with sampling sites.
Extracted data from primary literature examining impacts of recreational activities on freshwater ecosystems
<p>Aquatic ecosystems are attractive sites for recreation. However, human presence at or on aquatic ecosystems can have a range of ecological impacts, creating trade-offs between recreation as ecosystem service and biodiversity conservation. There is currently no synthesis of evidence regarding the ecological impacts associated with various forms of aquatic recreation, to compare the magnitude of effects between types of recreation. Therefore, conservation conflicts surrounding water-based recreation are difficult to manage. We conducted a global meta-analysis, differentiating various recreational impacts and the type of recreational uses in four categories: shore use, shoreline angling, swimming and boating; and studied ecological impacts directed at three levels of biological organization: individuals, populations, and communities. We screened over 13,000 articles and identified 94 suitable studies providing 701 effect sizes for inclusion in the meta-analysis. Aggregated across all animal and plant taxa, impacts of boating and shore use resulted in highly significant effects on almost all levels of biological organization. Regarding taxonomic groups, the most negative effects of water-based recreation were observed in invertebrates, whereas effects on birds were most pronounced at individual levels and not significant at community levels. From a conservation perspective, fostering water-based recreation and the ecological services they provide must be balanced with ecological impacts associated with the activities. Although generalizations are challenging, local scale effects of activity-specific constraints seem unlikely to be effective if other forms of water-based recreation continue.</p>
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem to changes in freshwater discharge and sea ice cover
<p>Data for figure 4 in <a href="https://doi.org/10.5194/egusphere-2022-916">https://doi.org/10.5194/egusphere-2022-916</a></p>
Community reorganization stabilizes freshwater ecosystems in intensively managed agricultural fields
<ol> <li>Sustainable intensification may depend on associating precision farming with the harnessing of ecological principles in crop fields and with integrating farms and non-farmed land in productive landscapes. Small wetlands could play an important role in both pursuits for having high per-unit-area rates of element cycling and species richness while deeply penetrating crop fields. However, their potential for ecosystem service provisioning is unlikely to be met if land management intensification promotes ecosystem destabilization in biomass production. </li> <li>We tested the consequences of land use intensification on various dimensions of freshwater ecosystem stability by means of a large-scale field experiment converting extensive pastures to intensive pastures and sugarcane plantations in Southeastern Brazil. Nested within experimental plots were 4,000-L mesocosms simulating ponds and puddles commonly found in productive landscapes. Mesocosms were monitored for basic physico-chemical parameters, nutrients, pesticides, phytoplankton standing crop, and the spontaneously colonizing biodiversity.</li> <li>3. Despite severe environmental change, the stability of sugarcane communities was no different from that of extensive and intensive pastures. This occurred because the local extinction of a sensitive top dragonfly predator following the application of vinasse and insecticide was compensated by colonization of a suite of more tolerant invertebrate mesopredators such as beetles and bugs. Community stability tended to increase with biomass asynchrony and species richness, evidencing a portfolio effect of biodiversity. Unfortunately, the species richness necessary to stabilize biomass production is unlikely to be available in many sugarcane fields and several other row crops.</li> <li> <em>Synthesis and applications.</em> Ponds and puddles could be effective centers of irradiation of ecosystem service provisioning in agricultural fields in terms of pest control; nutrient accumulation, cycling, and export back to fields; and habitat and stepping stones for freshwater biodiversity. However, the impoverished biodiversity that results from a combination of harsh local conditions and spatial isolation renders pond communities inherently unstable. Given the unlikely, immediate reduction in agrochemical use in much of the intensively managed crop area, a combination of large, protected source wetlands at the margin of fields and small constructed or naturally forming ponds and puddles in plantations could contribute to sustainable intensification.</li> </ol>
Using eDNA for monitoring fish and invertebrate biodiversity in freshwater ecosystems
Open the record for dataset details and reuse information.
Data from: Salty Sensors, Fresh Ideas: The use of molecular and imaging sensors in understanding plankton dynamics across marine and freshwater ecosystems
Open the record for dataset details and reuse information.
Combined toxicity of perfluorinated compounds and microplastics on the sentinel species Daphnia magna: Implications for freshwater ecosystems
Open the record for dataset details and reuse information.
Parasitism dramatically alters the ecosystem services provided by freshwater mussels
Open the record for dataset details and reuse information.
Community reorganization stabilizes freshwater ecosystems in intensively managed agricultural fields
Open the record for dataset details and reuse information.
History of the Giraffe Pipe locality inferred from microfossil remains: A thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
Open the record for dataset details and reuse information.
Ecosystem shifts and Cladocera responses in a freshwater lake in semi-arid regions: The successional synergistic effects of natural and human factors in the past 170 years
Open the record for dataset details and reuse information.
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.