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163 results for “Water chemistry”
Data from: Water level drawdown induces a legacy effect on the seed bank and retains sediment chemistry in a eutrophic clay wetland
<p>The lack of extreme water level fluctuations in managed, non-peat forming wetland ecosystems can result in decreased productivity through the loss of heterogeneity of these ecosystems. Stochastic disruption, such as a water level drawdown, can effectively reverse this effect and return the wetland to a more productive state, associated with higher biodiversity through new vegetation development. Yet, aside from the effect on vegetation dynamics, little is known about longer-term effects (30 years) of a water level drawdown, hereafter referred to as legacy effects, and how this may impact future water level drawdowns.</p> <p>Here, we aim to unravel the legacy effects of a water level drawdown, stand alone and along a water level gradient, on seed bank properties and nutrient availability in a eutrophic clay wetland. To identify these, we studied the hydrologically managed nature reserve Oostvaardersplassen in the Netherlands. Here, one section was subjected to a multi-year water level drawdown and another section was kept inundated. We determined seed bank properties in both areas, spatially and along a soil elevation gradient (20 cm). Nutrient availability was measured by taking sediment samples along the water level gradient and through experimental manipulation of the water level in an indoor mesocosm experiment.</p> <p>Germination was higher in locations with a water level drawdown history, especially at relatively high elevations. Additionally, the proportion of pioneer species in the seed bank was higher in the water level drawdown area. Overall, nutrient concentrations were higher compared to other systems. Nutrient availability was higher in the inundated area and did not respond to the water level gradient. We conclude that 30 years after an induced water level drawdown there is no depletion of nutrients, while we still observe a legacy effect in the number of viable seeds in the seed bank.</p>
Data from: The biogeographical patterns of species richness and abundance distribution in stream diatoms are driven by climate and water chemistry
In this inter-continental study of stream diatoms, we asked three important but still unresolved ecological questions: 1) What factors drive the biogeography of species richness and species abundance distribution (SAD); 2) Are climate-related hypotheses, which have dominated the research on the latitudinal and altitudinal diversity gradients, adequate in explaining spatial biotic variability; and 3) Is the SAD response to the environment independent of richness? We tested a number of climatic theories and hypotheses (i.e., the species-energy and the metabolic theory; and the energy variability and the climatic tolerance hypothesis) but found no support for any of these concepts as the relationships of richness with explanatory variables were non-existent, weak or unexpected. Instead, we demonstrated that diatom richness and SAD evenness generally increased with temperature seasonality and at mid- to high total phosphorus concentrations. The spatial patterns of diatom richness and the SAD—mainly longitudinal in the US, but latitudinal in Finland—were defined primarily by the covariance of climate and water chemistry with space. The SAD was not entirely controlled by richness, emphasizing its utility for ecological research. Thus, we found support for the operation of both climate and water chemistry mechanisms in structuring diatom communities, which underscores their complex response to the environment and the necessity for novel predictive frameworks.
Self-consistent Models of Y Dwarf Atmospheres with Water Clouds and Disequilibrium Chemistry
<p>This data set consists of 1d radiative-convective equilibrium models intended for Y Dwarfs or cool giant planets with negligible levels of external irradiation, computed using coolTLUSTY and a recently updated set of molecular absorption cross sections. Models span effective temperatures of 200 - 600 K, metallicities of [-0.5], [0], and [+0.5] dex, and surface gravities of log10(g / [cm/s^2]) = 3.5 - 5.0, and are computed for both cloudy and clear cases, in thermochemical equilibrium and with nonequilibrium carbon and nitrogen chemistry due to vertical mixing. Models extend from 0.5 microns to 300 microns with 30,000 frequency points evenly spaced in ln(frequency), which corresponds to an average resolving power of R ~ 4340.</p> <p>See README.txt for a description of file formats, naming conventions, and decompressed sizes.</p> <p>A more thorough summary of the assumptions made in computing these models and a walk-through of their properties can be found in Lacy & Burrows 2023 "Self-consistent Models of Y Dwarf Atmospheres with Water Clouds and Disequilibrium Chemistry" accepted for publication in the Astrophysical Journal and available on arXiv.</p> <p>If you make use of these models please cite that publication, along with this zenodo data set.</p>
Lake water chemistry and population of origin interact to shape fecundity and growth in Daphnia ambigua
<p>Freshwater environments vary widely in ion availability, owing to both natural and anthropogenic drivers. Field and laboratory work point to the importance of overall salinity as well as cation depletion, in shaping the physiology, behavior, and ecology of freshwater taxa. Yet, we currently have a poor understanding of the degree to which populations may vary in response to ion availability. Using <em>Daphnia</em> collected from three lakes that differ greatly in salinity and calcium availability, we conducted a laboratory reciprocal transplant experiment to assess how animals representing these populations vary in fecundity, body size, and survival when reared in lake water from each environment. The lake water environment and population of origin strongly interacted to shape <em>Daphnia</em> growth and reproduction. Surprisingly, we found only modest evidence that lake water with abundant calcium (5.5 mg/L vs. 1.2-2.3 mg/L) increased <em>Daphnia</em> growth or reproduction. In contrast, water from a relatively ion-rich lake (400 µS/cm specific conductance) strongly boosted <em>Daphnia</em> fecundity over lower-ion lake water (20-50 µS/cm), especially for the population originating from the high-ion environment. Our results suggest that ion-poor conditions common in regions around the world may exert stress on freshwater organisms, even for populations inhabiting these environments. Meanwhile, moderate salt enrichment may not prove harmful but could even benefit freshwater taxa in these ion-poor regions. The context dependence of how and when lake water chemistry affects <em>Daphnia</em> and other freshwater taxa deserves greater attention, in both ion-depleted and ion-rich conditions. <em>Daphnia</em> are key members of lake food webs and serve as an important model for ecology, evolution, and toxicology research. Consideration of how lake water chemistry may influence how Daphnia populations respond to abiotic and biotic stress may improve the ability to evaluate and predict ecological and evolutionary dynamics in lakes of varying chemical composition.</p>
Lake water chemistry and local adaptation shape NaCl toxicity in Daphnia ambigua
<p>The increasing application of road deicing agents (e.g., NaCl) has caused widespread salinization of freshwater environments. Chronic exposure to toxic NaCl levels can impact freshwater biota at genome to ecosystem scales, yet the degree of harm caused by road salt pollution is likely to vary among habitats and populations. The background water chemistry may strongly impact NaCl toxicity, with greater harm occurring in ion-poor freshwater environments. In addition, populations exposed to salinization may evolve increased NaCl tolerance. We examined the potential for these two factors, genetics and environmental context, to interact in shaping NaCl toxicity in natural populations of the water flea <em>Daphnia</em> <em>ambigua</em>. We performed a reciprocal transplant toxicity trial using <em>Daphnia</em> clones from three lakes varying in ion availability. NaCl toxicity greatly increased in calcium-poor (1.7 mg/L) lake water compared with a high-calcium (7.2 mg/L) environment, especially for <em>Daphnia</em> from the high-calcium lake. Meanwhile, <em>Daphnia</em> from an ion-rich lake showed evidence of adaptation to NaCl exposure, especially in their natal lake water. Our findings that the lake water environment, adaptation to that environment, and adaptation to a contaminant of interest may interact to shape toxicity demonstrate the importance of considering environmental and genetic complexity in mitigating pollution impacts.</p>
Lake water chemistry and local adaptation shape NaCl toxicity in Daphnia ambigua
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Lake water chemistry and population of origin interact to shape fecundity and growth in Daphnia ambigua
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Data from: The biogeographical patterns of species richness and abundance distribution in stream diatoms are driven by climate and water chemistry
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Data from: Water level drawdown induces a legacy effect on the seed bank and retains sediment chemistry in a eutrophic clay wetland
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Ohio Department of Natural Resources, Division of Wildlife, Reservoir Productivity Assessment Water Chemistry 2006-2007
Limnological data provided represent information collected during 2006–2007 for a total of 153 reservoirs. Some reservoirs were sampled in a single year, others were sampled in both years. Nearly all reservoirs were sampled during July or August near the dam at the deepest part of the reservoir. Additional samples for particular systems were taken in other months and at other sites (i.e., near the inflow). Many samples have complete Secchi transparencies, suspended solids (both total and non-volatile suspended solids), total phosphorus, total nitrogen, and chlorophyll a concentrations. Others are missing various parameters; some samples are represented by only a Secchi transparency measurement. Morphometric data and landuse/land cover data are provided for those systems where it had been previously compiled. All 153 reservoirs are represented in the provided lake shapefile whereas only 117 were included in the watershed shapefile. ' Over a 2-year period (2006 and 2007) we sampled 109 reservoirs (all Ohio reservoiurs > 10 ha), located throughout Ohio, USA, whose watersheds contain a variety of land cover types and a wide range of eutrophication levels. All reservoirs were sampled at least once during July or August in 2006 or 2007. … a subset of 34 of these reservoirs were sampled once in both 2006 and 2007. In addition, 10 reservoirs (“reference reservoirs”) were sampled at least once per month during July and August of both 2006 and 2007. Lakes were sampled by Miami personnel and DOW field crews (Districu3, District 4, and District 5).’
Massachusetts Department of Environment Protection (MADEP): lake water chemistry , 2005-2010
This database contains anion, nutrient, and secchi data collected by MA DEP for assessment of water quality in MA lakes. Data spans 2005-2010. The ultimate goal of the MassDEP is to implement a comprehensive monitoring program (status/assessment, trends and flows, and targeted) that serves all water quality management needs, and addresses streams, rivers, lakes, reservoirs, estuaries, coastal areas, wetlands, and groundwater. The five-year rotating watershed assessment program is currently the primary means of meeting the CWA objective related to assessing the status of designated uses. Requirements for the monitoring program designed to support watershed assessments, reflecting CWA mandates, are that it be statewide in scale, comprehensive (all water bodies in the Commonwealth are assessed), and repeated at regular intervals. Water quality surveys generally consist of five sampling events interspersed throughout the water recreation season for conventional water quality analyses such as pH, dissolved oxygen, suspended and total dissolved solids, nutrients, and fecal coliform bacteria.
Surface water chemistry:Scale Dependent Nutrient Interactions among Lacustrine Communities
E280 is a long-term study, initiated in 2013, to determine how nutrient retention vs. export in the uplands affects downslope aquatic communities. Experimental work will focus on stoichiometry and patterns of nutrient limitation at different observational scales. Our proposed work will test the hypothesis that with increasing spatial and temporal scale, interactions among limiting nutrients diminish and single factor limitation is increasingly prevalent.
Hubbard Brook Experimental Forest: Chemistry of Mirror Lake water column 1967 - 2010
Numerous studies have been conducted on Mirror Lake since the mid-1960s, including extensive physical, chemical, biological, and paleoecological research (Likens 1985). This data set includes chemistry data for water samples collected approximately monthly at an anchored buoy station located at the deepest part (11 m at full pool) of Mirror Lake. Measurements include ANC, DIC, DO, base cations, pH, ammonium, anions, temperature and dissolved silica. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Comprehensive Soil Water Chemistry at the Kellogg Biological Station, Hickory Corners, MI (1999 to 2003)
Dataset Abstract Soil water samples are collected every other week during the growing season from treatments 1-7 (replicates 2-4) and the successional and forest sites using Prenart soil water samplers (sometimes referred to as lysimeters). Three sampling stations are located in each treatment and are grouped in this analysis. In this dataset, the following chemical variables were measured from 1999-2005: Ca, Mg, Na, K, NO3, total alkalinity, Cl, SO4, NH4,PO4, DOC, specific conductance, total dissolved phosphorus and Si. See also the dataset entitled Soil Water Nitrate on the Main Cropping System Experiment which covers a longer time period. See the following reference for methods: Hamilton,S.K., A.L. Kurzman, C.Arango, L. Jin, and G.P. Robertson. 2007. Evidence for carbon sequestration by agricultural liming. Global Biogeochemical Cycles 21, GB2021, doi: 10.1029/2006GB002738. original data source http://lter.kbs.msu.edu/datasets/72
Stream water chemistry data for Green Lake 1, 1985 - 2010.
This is a summary of major ion concentrations for stream water samples collected at the outlet stream from Green Lake 1. Sampling point was at the plate weir where the stream emerges from the base of the lake dam, i.e. after drainage through the dam.
Lake water quality, chemistry and zooplankton composition for 16 lakes surrounding the Green Lakes Valley, 2016
This dataset contains water chemistry measurements made from 16 different lakes north and south of LTER site in the green lakes valley. At each visit water samples were collected for analysis of chlorophyll a and nutrient analysis and field measurements were recorded for pH, temperature, specific conductivity, dissolved oxygen (DO), % saturation, secchi depth, PAR. Secchi depth was measured using a 30cm disk to the nearest 0.25 meter and here recorded at the 0m row in the data file however it is a measurement of depth and so the units are meters. Most samples were collected between 0900 and 1300 MST. The first sampling date occurred shortly after lake had become ice free and then if the lake was at least 3 meters deep it was re-surveyed at approximately 2 week intervals. All data are collected from an inflatable raft at the point of deepest depth. All water samples were taken at the surface (0m), and the hypolimnion (about 2m above the lake sediment) using a Van Dorne sampler. Chlorophyll-a was extracted from water sample filters and absorbance was measured before and after acidification to quantify chlorophyll a concentration. Field measurements were conducted using a YSI either DO or multiple probe meter (YSI MPS 556) and a Li-Cor meter with a quantum sensor. Zooplankton samples were collected opportunistically 3 times throughout the summer, once immediately after ice-out and two more times with at least 14 days bewteen each subsequent visit. Zooplankton were sampled at the deepest location of each lake by pulling a conical net (Wisconsin net) vertically through the water column (i.e., vertical tow sample). The Wisconsin net is 0.9m long with an opening of an inner diameter of 0.2m and a mesh size of 80um. The vertical tow samples are taken from approximately 0.5 m off the lake bottom. After the net is raised and the sides rinsed, the sample is transferred to a 250 mL jar and preserved in a solution of 80% Ethanol. Jars are labeled with date (yyyy-mm-dd), time hh:
Water chemistry data for Green Lakes Valley, 2018
Recently, the link between air warming and stream chemistry fluxes at GLV was evaluated by Crawford et al (2019) that showed strong connection between the sum of average daily temperature at a monthly time step and normalized fluxes of base cations and SO4--. They explored the reasons for this relation evoking several direct and indirect mechanisms and concluded that enhanced sulfide mineral weathering in and around the rock glacier is a result of recent warming-induced changes to minerals weathering. However, on the basis of a pattern recognition analysis of base cations and major anions concentrations we hypothesized that the observed trends in the GLV and probably across the Rocky Mountains region resulted from a combination of several mechanisms rather than warming trend alone. So the main objective of this work is to re-examine the Niwot Ridge LTER long-term data coupled with additional ancillary data sets to ascertain the mechanisms instigating the observed trends.
Green Lakes 3-5 water chemistry and algal biomass.
Temperature, algal biovolume, nutrient content and chlorophyll content of water flowing from the outlets of Green Lakes 4 and 5 were monitored.
Stream water chemistry data for Como creek, 1998-2013
Surface water chemistry samples were taken from the Como Creek catchment located on and below the southeast flank of Niwot Ridge (40°N, 105°W) in Colorado, USA, approximately 4–9 km east of the Continental Divide. The catchment is 5.36 km2 in area and ranges in elevation from 2900 to 3560 m. Measurements began in 1998 and continue through 2013.
Water chemistry of tidal creeks in the Chesapeake Bay and Atlantic Coasts of Northampton County, VA 1990-1992
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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.