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168 results for “Headwater streams”
PIE LTER year 2015, 15 minute measurements of conductivity, water temperature in a small headwater stream draining a mainly wetland catchment (49% wetlands/swamp + 36% forest), Bear Br., draining Cedar Swamp, Reading, MA.
Year 2015, continuous measurements, every 15 minutes were made of conductivity, water temperature in Bear Brook in Reading, MA, a small headwater stream draining Cedar Swamp, a mainly wetland catchment (49% wetlands and swamp + 36% forest) in the Ipswich River watershed.
PIE LTER year 2014, 15 minute measurements of conductivity, water temperature in a small headwater stream draining a mainly wetland catchment (49% wetlands/swamp + 36% forest), Bear Br., draining Cedar Swamp, Reading, MA.
Year 2014, continuous measurements, every 15 minutes were made of conductivity, water temperature in Bear Brook in Reading, MA, a small headwater stream draining Cedar Swamp, a mainly wetland catchment (49% wetlands and swamp + 36% forest) in the Ipswich River watershed.
PIE LTER year 2012, 5 minute and 15 minute measurements of specific conductance, water temperature in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Year 2012, continuous measurements, every 5 minutes for the first deployment and 15 minutes until the end of the year, were made of conductivity, water temperature in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential). in the Ipswich River watershed.
PIE LTER year 2013, 15 minute measurements of specific conductance, water temperature in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Year 2013, continuous measurements, every 15 minutes were made of conductivity, water temperature in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential) in the Ipswich River watershed.
PIE LTER year 2014, 15 minute measurements of specific conductance, water temperature in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Year 2014, continuous measurements, every 15 minutes were made of conductivity, water temperature in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential) in the Ipswich River watershed.
PIE LTER year 2015, 15 minute measurements of specific conductance, water temperature in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Year 2015, continuous measurements, every 15 minutes were made of conductivity, water temperature in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential) in the Ipswich River watershed.
Data from : Fragmentation promotes the role of dispersal in determining 10 intermittent headwater stream metacommunities
<p>Dispersal, defined as the movement of individuals among local communities in a landscape, is a regional process determining metacommunity dynamics in ecosystems. Whereas both natural and anthropogenic ecosystem fragmentations can limit dispersal, previous attempts to measure such limitation have faced considerable context-dependency, due to a combination of spatial extent and associated environmental variability, the wide range of dispersal modes and abilities of organisms or variation in network topologies. Therefore, it is today unclear what role dispersal plays compared to local environmental filtering in explaining metacommunity dynamics in dendritic ecosystems. We quantified alpha and beta-diversity components of invertebrate metacommunities across ten fragmented headwater stream networks and tested the hypothesis that dispersal is the primary determinant of biodiversity organisation in these dynamic and spatially-constrained ecosystems. Alpha-diversity was much lower at intermittent reaches compared to perennial’s, including long upon rewetting, indicating an overwhelming effect of drying including a legacy on local communities. Beta-diversity was never correlated with environmental distances but predominantly explained by spatial distances accounting for river network fragmentation. The nestedness proportion of beta-diversity was considerable and echoed compositional differences that communities from intermittent reaches were subsets of perennial ones. Altogether, these results indicate dispersal is the primary process shaping metacommunity dynamics in these ten headwater stream networks, where local communities recurrently undergo extinction and recolonization events. This challenges previous conceptual views that local environment filtering is the main driver of headwater stream metacommunities. As the fragmentation of river networks is increasing due to global change, our results suggest that some freshwater ecosystems currently driven by local environment filtering could gradually become dispersal-limited. In this perspective, shifts from perennial to intermittent flow regimes represent tipping points that should not be crossed to not jeopardise river biodiversity, functional integrity and the ecosystem services they provide to society.</p>
Development of a benthic macroinvertebrate multimetric index (MMI) for Neotropical Savanna headwater streams. Appendix B
<p>Appendix B. List of taxonomic groups and their tolerance to pollution score, functional feeding group and mobility and attachment to substrate classification</p>
Data from: Influences of patch-burn grazing on headwater prairie streams and subsequent recovery
<p>1. Patch-burn grazing (PBG) can promote terrestrial heterogeneity and biodiversity, but can temporarily increase stream nutrients, ecosystem metabolism, and alter macroinvertebrate assemblages. The impacts of grazing on stream channel morphology and post-PBG recovery patterns are unclear. 2. We assessed the influence of grazing in PBG managed grassland streams in Missouri, USA, and subsequent recovery when grazing ceased for two years. We hypothesized that grazing would degrade water quality, stream biotic integrity, and channel morphology, but that riparian fencing would mitigate these effects. We predicted that biological and chemical variables in unfenced streams would return to pre-PBG levels within two years after grazing ceased, but channel morphology would not. 3. Six small headwater streams (two in ungrazed control watersheds, two in PBG watersheds with 10 m fenced riparian zones, and two in unfenced PBG) were sampled over seven years; 2 years before PBG, 3 years during PBG, and 2 years post-PBG. We sampled macroinvertebrates and water chemistry monthly when water was present and surveyed channel morphology at least once each study period. 4. During grazing, unfenced watersheds showed the greatest changes in channel width, depth, and area. During the post-PBG period, one of the two unfenced watersheds showed partial recovery of channel morphology. Although grazing increased concentrations of nutrients and chlorophyll a, concentrations returned to pre-PBG conditions after grazing ended, indicating recovery. Very fine organic sediments increased in the unfenced watersheds compared to the control during grazing but recovered afterwards. Contributions of Chironomidae to total invertebrate abundance increased in the unfenced watersheds during grazing, and then decreased during the post-PBG period. 5. Riparian fencing mostly mitigated effects of grazing on the streams. Unfenced streams were resilient to effects of grazing in a PBG managed grassland, with most metrics recovering within two years after grazing ceased, except for channel morphology. 6. Synthesis and applications: Grazing in a PBG managed grassland coupled with riparian fencing could be an effective conservation tool in prairies, with relatively modest influences on stream water quality and biotic integrity. Persistent changes in stream geomorphology and effects of longer periods of grazing deserve further research.</p>
Figure 4 in Far from urban areas: plastic uptake in fish populations of subtropical headwater streams
Figure 4. Length frequency distribution of the fibers.
Figure 2 in Far from urban areas: plastic uptake in fish populations of subtropical headwater streams
Figure 2. Plastic fibres from fish intestines.
Finkler et al. Short-term Effects of Wildfire on Ecosystem Functioning in a Tropical Headwater Stream.
<p>Dataset used for the manuscript "Short-term Effects of Wildfire on Ecosystem Functioning in a Tropical Headwater Stream" by Finkler et al.</p>
Benthic bacterial communities are shaped by browning in boreal headwater streams
Open the record for dataset details and reuse information.
Influences of patch-burn grazing on headwater prairie streams and subsequent recovery
Open the record for dataset details and reuse information.
PIE LTER year 2012, 5 minute and 15 minute measurements of conductivity, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Year 2012, continuous measurements every 5 minutes during the first deployment and then 15 minutes for the remainder of the year, were made of conductivity, 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.
PIE LTER year 2013, 15 minute measurements of conductivity, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Year 2013, continuous measurements every 15 minutes were made of conductivity, 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.
Development of a benthic macroinvertebrate multimetric index (MMI) for Neotropical Savanna headwater streams. Appendix C
<p>Appendix C. Metric Screening<br> </p>
Data from: Landscape configuration alters spatial arrangement of terrestrial-aquatic subsidies in headwater streams
Context: Freshwater ecosystems depend on surrounding terrestrial landscape for resources. Most important are terrestrial leaf litter subsidies, which differ depending on land use. We lack a good understanding of the variation of these inputs across spatial scales. Objectives: We sought to determine: (1) the relative importance of local versus catchment-level forestation for benthic leaf litter biomass in streams, (2) how landscape configuration alters these relationships, and (3) how land use affects the quality and diversity of leaf litter subsidies. Methods: We measured biomass and identity of benthic leaf litter in 121 reaches in 10 independent catchments seasonally over the course of a year. We assessed direct and indirect effects of forestation, reach position, and seasonality on leaf litter biomass using structural equation models, and assessed how leaf litter diversity varied with land use. Results: In catchments with forested headwaters, the degree of forestation and reach position in the catchment influenced benthic leaf litter biomass indirectly through local reach-scale forestation. In catchments where forest was only located downstream, or with minimal forest, none of these factors influenced reach-level benthic leaf litter. Leaf litter diversity peaked in fall in all land use types, but was generally lowest in forested reaches. Conclusions: Not only habitat amount, but its location relative to other habitats is important for ecosystem function in the context of cross-ecosystem material flows. Here, lack of upstream forest altered spatial patterns of leaf litter storage. Studies with high spatiotemporal resolution may further reveal effects of landscape configuration on other ecosystems.
FIGURE 3 in A new species of Astyanax from headwater streams of southern Brazil (Characiformes: Characidae)
FIGURE 3. Map of southern Brazil and Uruguay, showing the distribution of the examined material of Astyanax pirabitira. A = rio das Antas, laguna dos Patos system, and P = rio Pelotas, rio Uruguay basin. Some symbols represent more than one lot or locality. Red circle = type locality.
FIGURE 1. Astyanax pirabitira, MCP 47707, 53.9 in A new species of Astyanax from headwater streams of southern Brazil (Characiformes: Characidae)
FIGURE 1. Astyanax pirabitira, MCP 47707, 53.9 mm SL, holotype, rio das Antas, border between Cambará do Sul and Bom Jesus, Rio Grande do Sul, Brazil. Scale bar = 1 cm.
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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.