scholarly journals Unlocking our understanding of intermittent rivers and ephemeral streams with genomic tools

2021 ◽  
Author(s):  
Rosetta C Blackman ◽  
Florian Altermatt ◽  
Arnaud Foulquier ◽  
Tristan Lefébure ◽  
Maïlys Gauthier ◽  
...  
Keyword(s):  
Ephemeral Streams ◽  
Intermittent Rivers ◽  
Genomic Tools

scholarly journals Hydrological, Environmental and Taxonomical Heterogeneity during the Transition from Drying to Flowing Conditions in a Mediterranean Intermittent River

Biology ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 316
Author(s):  
Andy Banegas-Medina ◽  
Isis-Yelena Montes ◽  
Ourania Tzoraki ◽  
Luc Brendonck ◽  
Tom Pinceel ◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Base Flow ◽  
Ephemeral Streams ◽  
Biogeochemical Processes ◽  
Flow Conditions ◽  
Intermittent Rivers ◽  
Terrestrial Biodiversity ◽  
Turn Over ◽  
Zero Flow ◽  
Intermittent River

Intermittent rivers and ephemeral streams (IRES) are increasingly studied because of their often-unique aquatic and terrestrial biodiversity, biogeochemical processes and associated ecosystem services. This study is the first to examine the hydrological, physicochemical and taxonomic variability during the dry-wet transition of an intermittent river in the Chilean Mediterranean Zone. Based on 30-years of river monitoring data and the TREHS tool, the hydrology of the river was characterised. Overall, the river shows a significant reduction in streamflow (−0.031 m3/s per year) and a substantial increase of zero flow days (+3.5 days per year). During the transition of hydrological states, variations were observed in the environmental conditions and invertebrate communities. During the drying phase, abundance, richness, and diversity were highest, while species turn-over was highest during base flow conditions. The disconnected pools and the flow resumption phases were characterised by high proportions of lentic taxa and non-insects, such as the endemic species of bivalves, gastropods, and crustaceans, highlighting the relevance of disconnected pools as refuges. Future climatic change scenarios are expected to impact further the hydrology of IRES, which could result in the loss of biodiversity. Biomonitoring and conservation programmes should acknowledge these important ecosystems.

scholarly journals Science and Management of Intermittent Rivers and Ephemeral Streams (SMIRES)

2017 ◽  
Vol 3 ◽  
pp. e21774 ◽  
Author(s):  
Thibault Datry ◽  
Gabriel Singer ◽  
Eric Sauquet ◽  
Dídac Jorda-Capdevila ◽  
Daniel Von Schiller ◽  
...  
Keyword(s):  
Ecological Status ◽  
Global Scale ◽  
Research Network ◽  
River Networks ◽  
Ephemeral Streams ◽  
Catchment Scale ◽  
Water Demands ◽  
Raising Awareness ◽  
Intermittent Rivers ◽  
Working Groups

More than half of the global river network is composed of intermittent rivers and ephemeral streams (IRES), which are expanding in response to climate change and increasing water demands. After years of obscurity, the science of IRES has bloomed recently and it is being recognised that IRES support a unique and high biodiversity, provide essential ecosystem services and are functionally part of river networks and groundwater systems. However, they still lack protective and adequate management, thereby jeopardizing water resources at the global scale. This Action brings together hydrologists, biogeochemists, ecologists, modellers, environmental economists, social researchers and stakeholders from 14 different countries to develop a research network for synthesising the fragmented, recent knowledge on IRES, improving our understanding of IRES and translating this into a science-based, sustainable management of river networks. Deliverables will be provided through i) research workshops synthesising and addressing key challenges in IRES science, supporting research exchange and educating young researchers, and ii) researcher-stakeholder workshops translating improved knowledge into tangible tools and guidelines for protecting IRES and raising awareness of their importance and value in societal and decision-maker spheres. This Action is organized within six Working Groups to address: (i) the occurrence, distribution and hydrological trends of IRES; (ii) the effects of flow alterations on IRES functions and services; (iii) the interaction of aquatic and terrestrial biogeochemical processes at catchment scale; (iv) the biomonitoring of the ecological status of IRES; (v) synergies in IRES research at the European scale, data assemblage and sharing; (vi) IRES management and advocacy training.

scholarly journals Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter

2019 ◽  
Vol 25 (5) ◽  
pp. 1591-1611 ◽  
Author(s):  
Oleksandra Shumilova ◽  
Dominik Zak ◽  
Thibault Datry ◽  
Daniel Schiller ◽  
Roland Corti ◽  
...  
Keyword(s):  
Organic Matter ◽  
Global Analysis ◽  
Ephemeral Streams ◽  
Intermittent Rivers

Genetic, Evolutionary, and Biogeographical Processes in Intermittent Rivers and Ephemeral Streams

2017 ◽  
pp. 405-431 ◽  
Author(s):  
Núria Bonada ◽  
Stephanie M. Carlson ◽  
Thibault Datry ◽  
Debra S. Finn ◽  
Catherine Leigh ◽  
...  
Keyword(s):  
Ephemeral Streams ◽  
Intermittent Rivers

The Biota of Intermittent Rivers and Ephemeral Streams: Prokaryotes, Fungi, and Protozoans

2017 ◽  
pp. 161-188 ◽  
Author(s):  
Anna M. Romaní ◽  
Eric Chauvet ◽  
Catherine Febria ◽  
Juanita Mora-Gómez ◽  
Ute Risse-Buhl ◽  
...  
Keyword(s):  
Ephemeral Streams ◽  
Intermittent Rivers

scholarly journals Extrapolating regional probability of drying of headwater streams using discrete observations and gauging networks

2017 ◽  
Author(s):  
Aurélien Beaufort ◽  
Nicolas Lamouroux ◽  
Hervé Pella ◽  
Thibault Datry ◽  
Eric Sauquet
Keyword(s):  
Headwater Streams ◽  
Regional Scale ◽  
National Level ◽  
Ephemeral Streams ◽  
Field Observations ◽  
Discrete Observations ◽  
Data Set ◽  
Intermittent Rivers ◽  
The Impact ◽  
Flow Intermittence

Abstract. Headwater streams represent a substantial proportion of river systems and have frequently flows intermittence due to their upstream position in the network. These intermittent rivers and ephemeral streams have recently seen a marked increase in interest, especially to assess the impact of drying on aquatic ecosystems. The objective of this paper is to quantify how discrete (in space and time) field observations of flow intermittence help to extrapolate the daily probability of drying at the regional scale. Two empirical models based on linear or logistic regressions have been developed to predict the daily probability of intermittence at the regional scale across France. Explanatory variables were derived from available daily discharge and groundwater level data of a dense gauging/piezometer network, and models were calibrated using discrete series of field observations of flow intermittence. The robustness of the models was tested using (1) an independent, dense regional data set of intermittence observations, (2) observations of the year 2017 excluded from the calibration. The resulting models were used to simulate the regional probability of drying in France: (i) over the period 2011–2017 to identify the regions most affected by flow intermittence; (ii) over the period 1989–2017, using a reduced input dataset, to analyze temporal variability of flow intermittence at the national level. The two regressions models performed equally well between 2011 and 2017. The accuracy of predictions depended on the number of continuous gauging/piezometer stations and intermittence observations available to calibrate the regressions. Regions with the highest performance were located in sedimentary plains, where the monitoring network was dense and where the regional probability of drying was the highest. Conversely, worst performances were obtained in mountainous regions. Finally, temporal projections (1989–2016) suggested highest probabilities of intermittence (> 35 %) in 1989–1991, 2003 and 2005. A high density of intermittence observations improved the information provided by gauging stations and piezometers to extrapolate the spatial distribution of intermittent rivers and ephemeral streams.

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