Drought refuges affect algal recolonization in intermittent streams

2004 ◽  
Vol 20 (7) ◽  
pp. 753-763 ◽  
Author(s):  
Belinda J. Robson ◽  
Ty G. Matthews
Keyword(s):  
Intermittent Streams

The Goldilocks effect: intermittent streams sustain more plant species than those with perennial or ephemeral flow

2011 ◽  
Vol 57 (3) ◽  
pp. 467-480 ◽  
Author(s):  
GABRIELLE L. KATZ ◽  
MICHAEL W. DENSLOW ◽  
JULIET C. STROMBERG
Keyword(s):  
Plant Species ◽  
Intermittent Streams

Analysis of the active length dynamics on intermittent streams using water presence sensors

2021 ◽  
Author(s):  
Francesca Zanetti ◽  
Nicola Durighetto ◽  
Filippo Vingiani ◽  
Gianluca Botter
Keyword(s):  
Objective Evaluation ◽  
Electrical Signal ◽  
Current Intensity ◽  
Active Network ◽  
Exceedance Probability ◽  
Intermittent Streams ◽  
Stream Network ◽  
Stream Length ◽  
Active Length ◽  
Event Based

<p>Headwater streams are important for their hydrological function and for their significant contribution to the riverine ecosystems. Nevertheless their study has always been challenging because of the ephemeral and intermittent nature of those streams. Maps representing the active part of the river network are usually drawn after field surveys performed under different hydrologic conditions, which enable an objective evaluation of the temporal changes in the length of the active network. This method is useful to describe seasonal variations of the stream length, but has significant limitations when it comes to the description of event-based changes of the flowing network, provided that visual inspections of entire catchments are highly time-consuming. In this work, electrical resistance (ER) sensors were used to analyze event-based active network dynamics along some of the tributaries of an Alpine creek in northern Italy. Current intensity values were collected every 5 minutes by the sensors and a threshold electrical signal was identified to distinguish between wet and dry status of the reaches where the probes were placed. A statistical analysis revealed a good correlation among the mean current intensity recorded, the exceedance probability of the threshold and the persistency of the nodes. Data collected by the sensors were also interpolated in space along the network to obtain a sequence of maps of the active and dry parts of the stream network. From each map the wet length (L) of the watercourse was derived and linked to the corresponding discharge (Q) at the outlet of the catchment. Small and intense precipitation events had different effects on the variations of Q and L: the network length was found to be more sensitive than discharge to small precipitation inputs; relevant stream flow variations were instead observed only during significant events that originated the largest changes in the active network length.  This heterogeneous behaviour negatively affected the quality of the fitting of empirical discharges vs. wet length data through a power law model. Water presence sensors provide an opportunity to study in depth the spatiotemporal dynamics of the active length of intermittent streams and link such dynamics to the relevant hydrological drivers.</p>

Bat Activity along Intermittent Streams in Northwestern California

2001 ◽  
Vol 82 (3) ◽  
pp. 738-747 ◽  
Author(s):  
V. M. Seidman ◽  
C. J. Zabel
Keyword(s):  
Intermittent Streams ◽  
Bat Activity

Trichoptera and Plecoptera of the Seybouse River, northeast Algeria: Distribution, phenology and new records

Zootaxa ◽  
2020 ◽  
Vol 4845 (4) ◽  
pp. 552-564
Author(s):  
BOUDJÉMA SAMRAOUI ◽  
ZINEB BOUHALA ◽  
ANTONIO RUIZ GARCIA ◽  
JOAQUÍN MÁRQUEZ-RODRÍGUEZ ◽  
MANUEL FERRERAS-ROMERO ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
North Africa ◽  
New Records ◽  
Intermittent Streams ◽  
North African ◽  
Longitudinal Gradient ◽  
Rivers And Streams ◽  
Northeastern Algeria

The stoneflies and caddisflies of North Africa are still poorly known as vast areas of Algeria have yet to be investigated. A survey of the macroinvertebrates of the Seybouse River, northeast Algeria, was carried out from July 2014 to December 2016. Three species of stoneflies (Capnopsis schilleri, Capnioneura petitpierreae, and Tyrrhenoleuctra tangerina) and five taxa of caddisflies (Mesophylax aspersus, Hydropsyche maroccana, H. resmineda, H. artax/lobata, and H. gr. pellucidula) were identified. All taxa are new records to the Seybouse River and seven of them are new to northeastern Algeria. A multivariate analysis indicated that the Hydropsychidae exhibited a clear longitudinal gradient along the Seybouse River while Mesophylax aspersus seemed adapted to species-poor, intermittent streams. Further investigations of the stoneflies and caddisflies may inform conservation efforts and will prove useful to monitor the Seybouse River and similarly threatened North African rivers and streams. 

scholarly journals Refuges and ecological traps: Extreme drought threatens persistence of an endangered fish in intermittent streams

2020 ◽  
Vol 26 (7) ◽  
pp. 3834-3845
Author(s):  
Ross Vander Vorste ◽  
Mariska Obedzinski ◽  
Sarah Nossaman Pierce ◽  
Stephanie M. Carlson ◽  
Theodore E. Grantham
Keyword(s):  
Extreme Drought ◽  
Intermittent Streams ◽  
Endangered Fish

scholarly journals Influence of grazing on channel morphology of intermittent streams.

2006 ◽  
Vol 55 (6) ◽  
Author(s):  
M.R. George ◽  
R.E. Larsen ◽  
N.K. McDougald ◽  
K.W. Tate ◽  
J.D. Gerlach ◽  
...  
Keyword(s):  
Channel Morphology ◽  
Intermittent Streams
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