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168 results for “headwater stream”
FIGURE 1 in Taxonomic and phylogenetic beta diversity in headwater stream fish communities of the Paraná and Paraguai River basins
FIGURE 1 | Headwater streams sampled in the Paraná and Paraguai River basins. Blue circles represent streams of the Paraguai basin, and black triangles represent streams of the Paraná basin. The stars represent waterfalls. The color indicates the variation in altitude.
FIGURE 3 in Fish functional trophic groups in headwater karst streams from the Upper Paraguay River basin
FIGURE 3 | Representative images of the fish assemblage from Serra da Bodoquena streams. A. Farlowella paraguayensis among twigs and leaf litter in the substrate; B. Hypostomus froehlichi between boulders; C. Creagrutus meridionalis foraging near a sandy substrate; D. Pimelodella taenioptera and Astyanax lacustris foraging among leaf litter in the substrate; E. Hyphessobrycon eques and Jupiaba acanthogaster using marginal vegetation; F. Characidium zebra using the sit-and-wait tactics on the sandy substrate; G. Psalidodon marionae foraging near the rocky substrate; H. Salminus brasiliensis swimming in the water column; I. Prochilodus lineatus foraging near patches of vegetation. Photos: Renato M. Romero and Fabrício B. Teresa.
FIGURE 4 in Fish functional trophic groups in headwater karst streams from the Upper Paraguay River basin
FIGURE 4 | Compilation of number of families on each Functional Trophic Group among different biomes in Brazil. Bar colors represent the shared FTGs among biomes considering Sazima (1986), Sabino, Zuanon (1998), Casatti et al. (2001), Brejão et al. (2013), Freitas et al. (2021), and this work. Blue bar: FTGs registered in Pantanal+Amazon+Atlantic Forest; Red bar: FTGs registered in Pantanal+Amazon; Green bar: FTG registered only in Amazon. Silhouettes represent the families with more records on each FTG.
FIGURE 1 in Fish functional trophic groups in headwater karst streams from the Upper Paraguay River basin
FIGURE 1 | Main drainages of Serra da Bodoquena. The Miranda River watershed (blue) and the Perdido River watershed (red). Highlighted lines represent Salobra River in the North and Perdido River in the South. In green, the Formoso River watershed, a tributary of Miranda drainage. Black dots represent the points of underwater observations of the fish species.
FIGURE 2 in Fish functional trophic groups in headwater karst streams from the Upper Paraguay River basin
FIGURE 2 | Distribution of sizes classes of fish from Serra da Bodoquena stream according to instream horizontal occupation.
FIGURE 5 in Fish functional trophic groups in headwater karst streams from the Upper Paraguay River basin
FIGURE 5 | Number of accumulated Functional Trophic Groups by fish families considering Brazilian inland freshwaters works from Sazima (1986), Sabino, Zuanon (1998), Casatti et al. (2001), Brejão et al. (2013), Freitas et al. (2021), and this work.
Allen et al., Similarity of stream width distributions across headwater systems, data 2017
<p>These files contain the results from Allen et al. "Similarity of stream width distributions across headwater systems".</p> <p>locationStreamSurveys.zip : contains stream hydromorphology data collected in seven headwater catchments in North America and New Zealand.</p> <p>repeatStreamSurveys.zip : contains stream hydromorphology data collected in six repeat surveys in the Stony subcatchment in Duke Forest, NC. </p> <p>streamWidthModelOutput.zip : contains stream width model parameters and output data presented in Allen et al. </p> <p>Note: the code used to analyze these data can be found at https://github.com/geoallen/streamWidthAnalysis2017/</p> <p> </p>
HeadwaterstreamSNevada: data on riparian vegetation and water parameters of headwater streams in Sierra Nevada, Spain
<p>Providing historical data on riparian plant biodiversity and physico-chemical parameters of stream water in Mediterranean mountains helps to assess the effects of climate change and other human stressors on these sensitive and critical ecosystems. This database collects data from the main natural headwater streams of the Sierra Nevada (southeastern Spain), a high mountain (up to 3,479 meters above sea level, m.a.s.l.) recognized as a biodiversity super hotspot (Arroyo et al., 2022) in the Mediterranean Basin. On this mountain, rivers and landscapes depend on snowmelt water, representing an excellent scenario for evaluating global change's impacts. This dataset covers first- to third-order headwater streams at 41 sites from 832 to 1,997 m.a.s.l., collected from December 2006 to July 2007. Our goal is to supply information on the vegetation associated with streambanks, the essential physico-chemical parameters of stream water, and the physiographic features of the subwatersheds. Riparian vegetation data correspond to six plots sampled at each site, including total canopy, individual number, height and DBH (diameter at breast height) in woody species, and cover percentage for herbs. Physico-chemical parameters were measured in situ (electric conductivity, pH, dissolved O2 concentration, stream discharge) and determined in the laboratory [alkalinity, soluble reactive phosphate-phosphorus (SRP), total phosphorus (TP), nitrate-nitrogen (NO3-–N), ammonium-nitrogen (NH4+–N), total nitrogen (TN)]. Watershed physiographic variables comprise drainage area, minimum altitude, maximum altitude, mean slope, orientation, stream order, stream length, and land cover surface percentage. We recorded 197 plant taxa (67 species, 28 subspecies and 2 hybrids), representing 8.4% of the Sierra Nevada vascular flora. Due to the botanical nomenclature used, the database can be linked to FloraSNevada database (Lorite et al., 2020), contributing to Sierra Nevada (Spain) as a laboratory of global processes.</p> <p>For more information about the data, see the metadata document (Metadata_HeadwaterstreamSNevada.docx).</p>
Data for 'Thermal regimes of groundwater- and lake-fed headwater streams differ in their response to climate variability'
<p>This dataset contains seasonal and annual mean spot stream temperatures for the six groundwater-fed and seven lake-fed streams at the Turkey Lakes Watershed. We have also included seasonal and annual scale hydroclimatic variables (air temperature, solar radiation, discharge, precipitation, ice on/off dates, and April 1st SWE). The Turkey Lakes Watershed is approximately 65 km northwest of Sault Ste. Marie, Ontario, Canada. Manual spot stream temperature measurements were made by field technicians visiting the catchment outlets as part of a routine water quality monitoring program at the TLW. The stream temperature data record extends from 1983 through 2018. The stream temperature record for stream 013 is 1986-2018. Hydroclimatic data is also 1983-2018, with the exception of lake ice data which ended in 2015. See the methods section of the associated publication for more details.</p>
Hydrobiogeochemical controls on the delivery of dissolved organic matter to boreal headwater streams
<p>Dataset of continuous stream discharge, soil moisture, and hydrographic separation of Upper Horseshoe and Lower Horseshoe stream sites near Pynn's Brook, Newfoundland. Matched to continuous data where available are dissolved organic carbon concentration, absorbance at 254 nm and specific UV absorbance measurements from discrete samples collected via autosampler or grab-sampled.</p>
Decade-scale stream morphology and stream fish community structure in headwater streams draining Mississippi's National Forests
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Data from: Leaf-associated macroinvertebrate assemblage and leaf litter breakdown in headwater streams depend on local riparian vegetation
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Agriculture land-use change seasonally rewires stream food webs: A case study from headwater streams in the Lake Erie watershed
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Methane concentrations and fluxes in agricultural and preserved tropical headwater streams
Tropical streams have been intensively impacted by agricultural activities. Among the most important agricultural activities in Brazil, sugarcane production represents a large impact for economic development and for environmental conditions. Permeating sugarcane fields, several headwater streams can be affected by sugarcane cultivation, in special, aquatic biogeochemical cycles because of the deforestation, fertilization, crop residues and higher temperatures in the tropics. In this study, we analyzed the effects of sugarcane cultivation on methane fluxes and concentrations, assuming that carbon cycles are influenced by agricultural activities in headwater streams. Our study aimed to (1) measure methane fluxes and concentrations in tropical streams located in Southeastern Brazil, (2) Analyze whether seasonal cycles influence methane fluxes and concentrations, (3) Evaluate the influence of sugarcane cultivation on methane fluxes and (4) Analyze the association between water chemistry in the methane concentrations in tropical streams. We found mean fluxes of CH4 of 0.280 mmol m-2 d-1, with higher fluxes during the summer and in streams draining preserved catchments. The average CH4 concentrations were 0.695 µmol L-1, with higher values during the summer and in streams draining preserved catchments. Methane concentrations in the studied streams was influenced by dissolved oxygen (negatively), dissolved organic carbon (negatively), water velocity (positively) and conductivity (negatively). Methane concentrations were significantly higher than concentrations found in Temperate Grasslands, Savannas & Shrublands and similar to concentrations found in other tropical biomes (excluding Tropical & Subtropical Moist Broadleaf Forests which receives large amounts of organic inputs). We conclude that sugarcane influence methane concentrations and fluxes in tropical streams by reducing the organic matter availability provided by the native vegetation in soil and water.
The Influence of Flow on Creek Chub (Semotilus atromaculatus) Movement in an Intermittent Urban Headwater Stream
Fish movement in freshwater streams is often tied to patterns of flow, especially when the stream is intermittent, flashy, or some combination thereof. This relationship between flow and fish movement is exacerbated in small urban streams in impervious surface-dominated watersheds that lead to extreme flow conditions. This study focused on the response of Creek Chub (Semotilus atromaculatus), a common pioneer fish species in eastern North America, to flow events of various sizes in a small intermittent urban headwater stream. Our primary goals were to determine 1) the level of Creek Chub movement occurring in an intermittent headwater stream, 2) the influence of flow on movement direction and magnitude, 3) the degree of variation in individual movement behavior, and 4) mortality rates in the system. The study used PIT tagging and telemetry surveys to monitor Creek Chub movement over a six-month period. We found that individual Creek Chub in our study system were generally mobile (71%), but usually moved short distances only; however, a few individuals moved much farther, with a maximum single movement of 521 m. Moderate or major flow events increased the probability and magnitude of Creek Chub movement, and neither upstream nor downstream movement was favored. Movement was variable among individual fish and fish were able to respond to large and small flow events to move among habitats. Finally, we observed relatively high, but episodic, mortality in our study site, potentially related to pollution events. Evidence of elevated mortality emphasizes the importance of movement in highly disturbed streams, as it may enable recolonization after local extirpation.
Total numbers per square meter and taxa of insects taken during a survey of headwater streams in the Toolik Lake region during the summer of 2001, Arctic LTER 2001.
A Surber sampler (25 X 25 cm frame fitted with a 243 um mesh net) was used to sample invertebrates on a single date at each site. Five replicates were taken from at least two riffles at each site. Samples were preserved in 4% formaldehyde and transported to Orono, Maine, where invertebrates were removed by hand under 15X magnification and then identified and counted. All values are the mean of five replicates and have been converted to individuals per square meter.
Year 2005, 15-30 minute measurements of stage, water temperature and conductivity in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Continuous measurements, every 15-30 minutes, were made of stage, water temperature, conductivity, dissolved oxygen, and pH in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland). Discharge is determined from stage using discharge vs stage regressions. Several day gaps occur periodically due to removal for recalibration.
Year 2006, 15-30 minute measurements of stage, water temperature, and conductivity in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Continuous measurements, every 15-30 minutes, were made of stage, water temperature, conductivity in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland). Discharge is determined from stage using discharge vs stage regressions. Several day gaps occur periodically due to removal for recalibration.
Year 2007, 10 minute measurements of stage, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Creek, Newbury, MA.
Year 2007, continuous measurements, every 10 minutes, were made of stage, water temperature in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland) in the Parker River watershed. Discharge is determined from stage using discharge vs stage regressions.
Year 2005, 15 or 30 minute measurements of stage in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Year 2005 continuous measurements, every 15-30 minutes, were made of stage in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential). Some water temperature, conductivity, and dissolved oxygen numbers during the summer. Discharge is determined from stage using discharge vs stage regressions.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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