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30 results for “stream intermittency”
Supplementary data for "Ecological assessment of combined sewer overflow management practices through the analysis of benthic and hyporheic sediment bacterial assemblages of an intermittent stream"
<p><strong>Supplementary data for the Pozzi <em>et al.</em> paper entitled "Ecological assessment of combined sewer overflow management practices through the analysis of benthic and hyporheic microbial assemblages and a tracking of exogenous bacterial taxa in a peri-urban intermittent stream".</strong></p> <p># Created by Dr Adrien C. MEYNIER POZZI on June, 29th, 2023<br> # Part of DOmic research project funded by the Agence de l’Eau - Rhône Méditerranée Corse [AE-RMC, Project 2020 0702 DOmic, 2020-2023], and of the DOmic extension funded by the EUR H2O'Lyon [ANR-17-EURE-0018] of Université de Lyon<br> # Part of the Chaudanne river long-term experiment site belonging to the Observatoire de Terrain en Hydrologie Urbaine (OTHU)<br> # Part of the work conducted in the team on Opportinistic Bacterial Pathogen in the Environment (BPOE) led by Dr. Benoit Cournoyer<br> # Samples were obtained in 2 campaigns, corresponding to periods before (2010-2011) or after (2018) the implementation of the 91/271/EEC European Directive that limited Combined-Sewer Overflow (CSO) discharges to the Chaudanne river<br> # Samples consisted in surface water, benthic and hyporheic sediments taken in run, riffle and pool geomorphologic features, either upstream or downstream the CSO outlet, plus positive and negative controls</p> <table> <tbody> <tr> <td><strong>Metadata. Name and description of data tables provided as supplementary information</strong></td> </tr> <tr> <td><strong>Data Name</strong></td> <td><strong>Description</strong></td> </tr> <tr> <td>Data S1. River hydrology variables and hydraulic gradients at surveyed transects</td> <td>Array to describe the hydrologic variables and gradients at the studied transects. Top line is header, second line is metadata for each recorded variable, and third line is the unit of the variable, if any.</td> </tr> <tr> <td>Data S2. Environmental variables (water physical-chemistry, nutrients, FIBs, MTEs, PAHs) with metadata</td> <td>An array to list environmental variables for all true samples (n=90) included in the study. Sample identifiers and dates are provided. First 8 rows list the CAS number, SANDRE number, unit, method, limit of quantification and norm for each variable, if any.</td> </tr> <tr> <td>Data S3. Hydrological indices and synthetic variables computed with ClustOfVar</td> <td>Hydrological indices computed for the river flow, precipitations and CSO overflows computed over a 3-week period preceding each sampling date.</td> </tr> <tr> <td>Data S4. Discharge events selected to compute CSO dilution ratios</td> <td>An array to describe CSO events included for the computation of the CSO dilution ratio (SI Data 6A) together with 6 tables and 3 figures (SI Data 6B to 6J) describing the CSO event ratio all year round over the studied period, as well as for events that occurred before or after the CSO was modified and during low flow or high flow season. In SI Data 6A, top line is header and second line is metadata for each recorded variable.</td> </tr> <tr> <td>Data S5. Raw environmental matrix for use in R</td> <td>An array to list experimental design and environmental variables for all true samples and controls. Several environmental variables were synthetized using the ClustOfVar method (Chavent et al (2012) 10.18637/jss.v050.i13). Format is directly usable in R software.</td> </tr> </tbody> </table> <p> </p>
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.
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>
Data from: Effects of an experimental increase in flow intermittency on an alpine stream
<p>Flow intermittency occurs naturally in alpine streams. However, changing rainfall patterns and glacier retreat are predicted to increase the occurrence of flow intermittency in alpine catchments, with largely unknown effects on ecosystem structure and function. We conducted a flow manipulation experiment within a headwater stream of Val Roseg, a glacierized alpine catchment, to determine the effects of increased flow intermittency on aquatic macroinvertebrates, periphyton, benthic organic matter, and trophic structure. Compared to an adjacent reference channel, an increase in flow intermittency reduced macroinvertebrate density, taxa richness, and the proportion of rheophilic taxa. Density and richness remained low in the manipulated channel after resumption of natural flow. Flow intermittency did not affect organic matter standing stocks, but increased assimilation of periphyton by aquatic macroinvertebrates. Predation on aquatic invertebrates by riparian spiders also increased. We attribute many of these patterns to the timing of drying, which likely excluded summer-growing cohorts of rheophilic, aerial dispersers. This study suggests that reductions in summer glacial melt and rainfall events might increase flow intermittency and lead to fundamental changes in diversity and function of alpine fluvial networks.</p>
Data from: Coleoptera associated with intermittent streams and their riparian zones in south coastal British Columbia
<p><span>Intermittent streams that periodically cease surface flow have long been understudied in ecology and underrepresented in conservation policy. However, they currently account for 30-50% of the global river network, and that number is rising due to anthropogenic water extraction, land-use change, and climate change. We explored the Coleoptera biodiversity of the south Pacific-coast region of British Columbia, Canada, using pitfall traps at perennial and naturally-intermittent stream reaches, in shoreline, dry streambed, and riparian habitats, in both flowing (spring/early summer) and non-flowing (late summer) phases. We found that habitats around perennial reaches had significantly greater abundance of Coleoptera than those around intermittent reaches. However, neither habitat type nor flow regime were significant predictors of taxon richness, and intermittent stream sites featured unique taxa that were not found near perennial streams. This aligns with recent results from other taxonomic groups, finding that intermittent ecosystems can host high taxonomic diversity of Coleoptera, on par with or even greater than that of perennial streams. Because intermittent streams will likely become more prevalent within the global river network, we urgently need a better understanding of how different species use these habitats, which can inform appropriate biodiversity conservation efforts and flow management.</span></p>
Data from: Dry season survival of juvenile salmonids in an intermittent coastal stream
We estimated dry season survival of imperiled salmonids in an intermittent coastal stream in California across four years (2009-2012). Our study encompassed two dry and two wet winters allowing us to explore patterns of survival across and within dry seasons with different antecedent precipitation. Apparent survival of age-0+ steelhead trout (Oncorhynchus mykiss) was higher following wet winters compared to dry winters. Moreover, antecedent precipitation was positively correlated with cumulative survival of age-0+ steelhead. Within years, apparent survival of steelhead varied among weeks with a tendency to decrease in the late summer indicating that fish exhibited some resistance to seasonal drought. Additionally, we found a slight but significant survival advantage for age-0+ coho salmon (O. kisutch) compared to equal-aged steelhead. Our results emphasize the influence of antecedent precipitation in driving the survival of imperiled salmonids and highlight that these fishes are somewhat resistant to seasonal drought, at least to a point.
Data from: Dry season survival of juvenile salmonids in an intermittent coastal stream
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Data from: Coleoptera associated with intermittent streams and their riparian zones in south coastal British Columbia
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Data from: Effects of an experimental increase in flow intermittency on an alpine stream
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Ecological consequences of shifting habitat mosaics within and across years in an intermittent stream
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Aquatic top predator prefers terrestrial prey in an intermittent stream
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Isolation controls reestablishment mechanisms and post-drying community structure in an intermittent stream
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Data from: Riparian hunting spiders do not rely on aquatic subsidies from intermittent alpine streams
<p>Drying in alpine streams might decrease aquatic-terrestrial trophic linkages by reducing terrestrial predation on aquatic prey. We tested this hypothesis by investigating whether a common riparian predator (hunting spiders) in alpine environments assimilated a lower proportion of aquatic prey with increasing stream intermittency. We used high temporal-resolution data from electrical resistance sensors to map patterns of naturally-occurring flow intermittency across 30 headwater streams of Val Roseg, a glacierized catchment in the Swiss Alps. We collected riparian hunting spiders, as well as potential terrestrial and aquatic macroinvertebrate prey, from streams and their associated riparian zones across two seasons (Alpine spring and summer). We estimated aquatic contributions to spider diets (<i>p</i><sub>A</sub>) using (i) a gradient approach with aquatic invertebrate and spider carbon stable isotope ratio values (<i>δ</i><sup>13</sup>C), and (ii) Bayesian carbon and nitrogen (<i>δ</i><sup>15</sup>N) isotope mixing models. Spider <i>p</i><sub>A</sub> from the gradient method were not statistically different from zero in spring (0.08 ± 0.10) and low in summer (0.16 ± 0.04). Mixing models also estimated low dependence on aquatic prey in both seasons, although with potentially higher contributions in summer. Spider diet did not vary with increasing flow intermittency in either season. Our results suggested that alpine hunting spiders obtain most of their carbon from terrestrial prey. The slight increase in spider <i>p</i><sub>A</sub> during summer may correlate with peak emergence periods for aquatic insects, indicating opportunistic feeding by this riparian predator.</p>
Fig. 2 in Riffle Beetle Communities of Perennial and Intermittent Streams in Northern Nevada, USA, with a New State Record forOptioservus castaneipennis(Fall) (Coleoptera: Elmidae)
Fig. 2. Pie charts illustrating proportional abundances of elmid beetles in perennial stream sites in northern Nevada. Values for the Bray-Curtis Index of Similarity between successive sample events are presented between pie charts.
Fig. 3 in Riffle Beetle Communities of Perennial and Intermittent Streams in Northern Nevada, USA, with a New State Record forOptioservus castaneipennis(Fall) (Coleoptera: Elmidae)
Fig. 3. Pie charts illustrating proportional abundances of elmid beetles in intermittent stream sites in northern Nevada. Values for the Bray-Curtis Index of Similarity between successive sample events (July 2011 compared to May 2007) are presented between the pie charts.
Data from: Seasonal and functional variation in the trophic base of intermittent Alpine streams
<p>In high-altitude Alpine streams, seasonal cycles of snowmelt, glacial melt, and rainfall drive variation in the availability of algal food resources. Yet high-altitude streams also exhibit varying degrees of flow intermittency, from solely winter-drying streams to others that dry periodically throughout summer and autumn. These environmental drivers may interact in different ways to determine the functional trophic base of macroinvertebrates inhabiting high-altitude streams. Here, we estimated the proportional contribution of autochthonous resources to the assimilated diets of benthic macroinvertebrates in 26 headwater streams of Val Roseg, a high Alpine glacial catchment, using stable isotope analysis (<i>δ</i><sup>13</sup>C and <i>δ</i><sup>15</sup>N) of different macroinvertebrate families and their potential food sources. We compared dietary estimates along a gradient of flow intermittency and across 3 seasons (Alpine spring, summer and autumn). Assimilation from autochthonous sources was highest for collector-gatherers and filter feeders in spring, and for grazers in summer. Grazers had higher estimated assimilation from autochthonous sources in intermittent streams than in perennial streams, particularly in summer, while collector-gatherers showed little effect of flow intermittency on dietary estimates. However, responses were highly taxon-specific, with different responses to variation in flow intermittency and season across families within functional groups. Our results suggest that frequent summer drying events represent trade-offs between greater access to algal food resources and a higher risk of desiccation, but that differing life-history and functional feeding traits across macroinvertebrate taxa drive marked variation in the risks or benefits associated with inhabitants of drying streams.</p>
Data from: Seasonal and functional variation in the trophic base of intermittent Alpine streams
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Prolonged flow intermittency undermines the habitat potential of forested landscapes for a stream-dwelling dragonfly
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Data from: Riparian hunting spiders do not rely on aquatic subsidies from intermittent alpine streams
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Supplementary material 2 from: Laini A, Beermann AJ, Bolpagni R, Burgazzi G, Elbrecht V, Zizka VMA, Leese F, Viaroli P (2020) Exploring the potential of metabarcoding to disentangle macroinvertebrate community dynamics in intermittent streams. Metabarcoding and Metagenomics 4: e51433. https://doi.org/10.3897/mbmg.4.51433
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