Gilles Pinay

Gilles Pinay
French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Department of Waters

Dr

About

155
Publications
63,171
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12,135
Citations
Citations since 2016
44 Research Items
5947 Citations
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201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
Additional affiliations
January 2018 - present
Irstea
Position
  • Research Director
January 2012 - present
Université de Rennes 1
January 2007 - December 2011
University of Birmingham

Publications

Publications (155)
Article
Stream dissolved oxygen (DO) dynamics are an outcome of metabolic activity and subsequently regulate ecosystem functions such as in‐stream solute and sediment reactions. The synchronization of DO signals in and across stream networks is both a cause and effect of the mode and timing of these functions, but there is limited empirical evidence for ne...
Article
Aquatic ecosystem recovery from anthropogenic degradation can be hampered by internal feedbacks that stabilize undesirable states. The challenges of managing and predicting alternative states in lakes are well known, but state shifts in rivers and their attendant effects on ecosystem function remain understudied despite strong recent evidence that...
Article
Full-text available
An explosion in high frequency dissolved oxygen (DO) observations at river network scales is creating new opportunities to understand dynamic signals in streams and rivers. Among the most informative metrics obtained from DO time series is stream metabolism—comprising gross primary production (GPP) and ecosystem respiration (ER)—but its estimation...
Article
Nitrate contamination affects many of the Earth’s aquifers and surface waters. Large-scale predictions of groundwater nitrate trends normally require the characterization of multiple anthropic and natural factors. To assess different approaches for upscaling estimates of nitrate recovery, we tested the influence of hydrological, historical, and bio...
Article
Full-text available
Permafrost degradation is delivering bioavailable dissolved organic matter (DOM) and inorganic nutrients to surface water networks. While these permafrost subsidies represent a small portion of total fluvial DOM and nutrient fluxes, they could influence food webs and net ecosystem carbon balance via priming or nutrient effects that destabilize back...
Article
Full-text available
The quantification of solute and sediment export from drainage basins is challenging. A large proportion of annual or decadal loads of most constituents is exported during relatively short periods of time, a “hot moment,” which vary between constituents and catchments. We developed a new framework based on concentration-discharge (C-Q) relationship...
Article
Full-text available
Quantifying nutrient attenuation at watershed scales requires long-term water chemistry data, water discharge, and detailed nutrient input chronicles. Consequently, nutrient attenuation estimates are largely limited to long-term research areas or modeling studies, constraining understanding of the ecological characteristics controlling nutrient att...
Article
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Human water use, climate change and land conversion have created a water crisis for billions of individuals and many ecosystems worldwide. Global water stocks and fluxes are estimated empirically and with computer models, but this information is conveyed to policymakers and researchers through water cycle diagrams. Here we compiled a synthesis of t...
Article
A lot of attention has been given to the importance of riparian zones as a nitrogen buffer during the last 30 years. Expectations were high and have resulted often in mismanagement practices. This paper aims at revisiting during this period the main research advancement, questions generated, and the progress in understanding the role of interaction...
Article
The development of anoxic conditions in riparian wetland (RW) soils is widely known to release dissolved phosphorus (DP), but the respective roles of reductive dissolution of Fe-oxyhydroxide, pH changes and sediment inputs in this release remain debated. This study aimed to identify and quantify these respective roles via laboratory anaerobic/aerob...
Article
Full-text available
Over the last half century, humans have become the dominant force driving many of Earth’s cycles. Intensive agriculture has simultaneously increased nutrient loading of pastoral landscapes and decreased the capacity of these ecosystems to retain or remove excess nutrients. Widespread degradation of terrestrial and aquatic ecosystems has triggered t...
Article
Full-text available
Significance Although groundwater is a critical source of drinking water and irrigation, it has been polluted worldwide by agriculture, industry, and domestic activity. Because assessing groundwater quality and recovery rates is challenging, we developed a method for determining where and how quickly nitrate is removed in aquifers using just a few...
Article
Full-text available
Uncertainty about controls on long-term carbon (C) and nitrogen (N) balance, turnover, and isotopic composition currently limits our ability to predict ecosystem response to disturbance and landscape change. We used a two-century, postglacial chronosequence in Glacier Bay, Alaska, to explore the influence of C and N dynamics on soil and leaf stable...
Poster
Full-text available
Characterizing gaseous exchanges occurring at the stream-atmosphere interface is crucial to understand stream biogeochemistry and to infer the position of streams in the atmospheric greenhouse gases budget. However, stream reaeration coefficients are often estimated using one of the many existing empirical equations, which leads to major uncertaint...
Book
Full-text available
L’eutrophisation touche de nombreux lacs, réservoirs, rivières et zones côtières, en France et dans le monde. Elle génère des perturbations majeures pour les écosystèmes aquatiques et a des impacts sur les biens et les services associés, sur la santé humaine et sur les activités économiques. Cet ouvrage présente les connaissances scientifiques disp...
Article
Full-text available
Anthropogenic activities have more than doubled the amount of reactive nitrogen circulating on Earth, creating excess nutrients across the terrestrial-aquatic gradient. These excess nutrients have caused worldwide eutrophication, fundamentally altering the functioning of freshwater and marine ecosystems. Riparian zones have been recognized to buffe...
Poster
Full-text available
Stream water chemistry results from biochemical activity occurring in the surface, but also from processes occurring in the contributing compartments (soils, aquifers, hyporheic and riparian zones). Consequently, in-stream chemical signals contain information on circulations and reactivity in the deep compartment, which is spatially more integrativ...
Article
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Understanding how water and solutes enter and propagate through freshwater landscapes in the Anthropocene is critical to protecting and restoring aquatic ecosystems and ensuring human water security. However, high hydrochemical variability in headwater streams, where most carbon and nutrients enter river networks, has hindered effective modelling a...
Poster
Full-text available
Many lakes and reservoirs in Europe suffer from severe eutrophication. Accurate quantification of nutrient loads are critical for effective mitigation measures, but this information is often unknown. For example, in France, only 50 out of 481 lakes and reservoirs have national monitoring allowing estimation of interannual nitrogen and phosphorus lo...
Data
Water chemistry was collected for 56 subcatchments of the Couesnon and Rance Rivers in western France. Sites were sampled periodically from 2003 to 2016 and subcatchment characteristics were extracted for the area draining to each sampling site.
Chapter
Le présent document, constitue la synthèse du rapport d’une Expertise scientifique collective confiée par les ministères en charge de l’environnement et de l’agriculture et l’Agence française pour la biodiversité au CNRS, à l’Ifremer, à l’INRA et à Irstea. Il a été élaboré par un collectif d’experts scientifiques sans condition d’approbation préala...
Article
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Where Land Becomes Stream: Connecting Spatial and Temporal Scales to Better Understand and Manage Catchment Ecosystems; Rennes, France, 7–8 March 2017
Poster
Full-text available
The relationship between concentration and discharge (C-Q) can give insight into the location, abundance, rate of production or consumption, and transport dynamics of elements in coupled terrestrial-aquatic ecosystems. Consequently, the investigation of C-Q relationships for multiple elements at multiple spatial and temporal scales can be a powerfu...
Conference Paper
Full-text available
Unconfined shallow aquifers are commonly contaminated by nitrate in agricultural regions, because of excess fertilizer application over the last decades. Watershed studies have indicated that 1) changes in agricultural practices have caused changes in nitrate input over time, 2) denitrification occurs in localized hotspots within the aquifer, and 3...
Conference Paper
The distribution of groundwater residence time in a catchment provides synoptic information about catchment functioning (e.g. nutrient retention and removal, hydrograph flashiness). In contrast with interpreted model results, which are often not directly comparable between studies, residence time distribution is a general output that could be used...
Article
Full-text available
The movement of water, matter, organisms, and energy can be altered substantially at ecohydrological interfaces, the dynamic transition zones that often develop within ecotones or boundaries between adjacent ecosystems. Interdisciplinary research over the last two decades has indicated that ecohydrological interfaces are often “hotspots” of ecologi...
Article
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To investigate the prevalence and cause of concentration-discharge (C-Q) relationships for carbon, nutrients, major ions, and particulates, we analyzed 40 years of water quality data from 293 monitoring stations in France. Catchments drained diverse landscapes and ranged from 50 to 110,000 km2, together covering nearly half of France. To test for d...
Article
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Protecting or restoring aquatic ecosystems in the face of growing anthropogenic pressures requires an understanding of hydrological and biogeochemical functioning across multiple spatial and temporal scales. Recent technological and methodological advances have vastly increased the number and diversity of hydrological, biogeochemical, and ecologica...
Article
Accurate identification of phosphorus (P) forms is crucially important for understanding the geochemical cycle of P; however, until now the role of ferrous iron P (Fe(II)-P) buried in sediments has been completely ignored in nearly all sequential extraction procedures developed. Using sediment cores sampled from Donghu Lake in Wuhan, China, this st...
Poster
Full-text available
The poster presents the priliminary results of the experiment that had the aim to examine the temporal development of denitrifying bacterial populations in newly created biofilms and how it is affected by different environmental and habitat specific conditions.
Article
Predicting hydrological catchment behaviour based on measurable (and preferably widely available) catchment characteristics has been one of the main goals of hydrological modelling. Residence time distributions provide synoptic information about catchment functioning and can be useful metrics to predict their behaviours. Moreover, residence time di...
Article
Nitrogen pollution of freshwater and estuarine environments is one of the most urgent environmental crises. Shallow aquifers with predominantly local flow circulation are particularly vulnerable to agricultural contaminants. Water transit time and flow path are key controls on catchment nitrogen retention and removal capacity, but the relative impo...
Article
Full-text available
Direct and indirect effects from human activity have dramatically increased nutrient loading to aquatic inland and estuarine ecosystems. Despite an abundance of studies investigating the impact of agricultural activity on water quality, our understanding of what determines the capacity of a watershed to remove or retain nutrients remains limited. T...
Article
Expansion of commercial agriculture in equatorial regions has significant implications for regional nitrogen (N) budgets. Here we investigate changes in N availability and turnover in Southeast Asia following the replacement of tropical forest with oil palm plantations along a chronosequence of oil palm maturity (3-months to 15-year-old stands) and...
Article
Full-text available
Dissolved organic matter (DOM) was characterised in water samples sampled in the Lower Kinabatangan River Catchment, Sabah, Malaysia between October 2009 and May 2010. This study aims at: (i) distinguishing between the quality of DOM in waters draining palm oil plantations (OP), secondary forests (SF) and coastal swamps (CS) and, (ii) identifying t...
Article
Full-text available
Direct and indirect effects from agriculture, urbanization, and resource extraction have dramatically increased nutrient loading to aquatic inland and estuarine ecosystems. The capacity of a watershed to remove or retain nutrients is a function of biotic and abiotic conditions across the terrestrial-aquatic gradient including soil, groundwater, rip...
Article
Full-text available
1. In a rapidly changing world, ecology has the potential to move from empirical and conceptual stages to application and management issues. It is now possible to make large-scale predictions up to continental or global scales, ranging from the future distribution of biological diversity to changes in ecosystem functioning and services. With these...
Article
Full-text available
1. In a rapidly changing world, ecology has the potential to move from empirical and conceptual stages to application and management issues. It is now possible to make large-scale predictions up to continental or global scales, ranging from the future distribution of biological diversity to changes in ecosystem functioning and services. With these...
Conference Paper
Full-text available
Agricultural activity has increased nitrate concentration in groundwater worldwide, incurring substantial costs to society and representing one of the major environmental challenges of our generation. However, due to the high cost and difficulty of direct measurement of groundwater processes, the dynamics that govern nitrate transport and removal a...
Article
Full-text available
1. In a rapidly changing world, ecology has the potential to move from empirical and conceptual stages to application and management issues. It is now possible to make large-scale predictions up to continental or global scales, ranging from the future distribution of biological diversity to changes in ecosystem functioning and services. With these...
Article
Full-text available
Workshop Interdisciplinaire Biodiversité, Ecologie, Economie et Droit, Mission pour l’interdisciplinarité CNRS, Oléron, avril 2013
Conference Paper
Full-text available
Les milieux fracturés sont caractérisés par une forte compartimentation déjà bien documentée. Si la partie altérée proche de la surface est la partie la plus exploitée, la partie fracturée plus profonde est moins bien connue. En particulier, son rôle dans les écoulements de surface reste méconnu. En conséquence, le temps de réponse des bassins vers...
Article
Landscapes exposed by glacial retreat provide an ideal natural laboratory to study the processes involved in transforming a highly disturbed, glacially influenced landscape to a stable, diverse ecosystem which supports numerous species and communities. Large-scale vegetation development and changes in sediment availability, used as a proxy for para...
Article
Full-text available
Spatial patterns and trends in the concentration and quality of dissolved organic matter (DOM) are characterised across a tropical agricultural catchment using ultraviolet (UV)-visible absorbance, and fluorescence spectroscopy. Related determination of the environmental isotopes 18O and 2H clarify the dynamics of catchment water movement. Water sam...
Article
Full-text available
We thank Castellano and David for their insightful comments (1) on our paper (2), in which they point out that short-term changes in land use and agricultural management can lead to rapid reductions in nitrate leaching from agricultural systems. We fully agree with Castellano and David that in diversified cropping system, this N distribution may be...
Article
Full-text available
Significance Fertilizers are of key importance to sustain modern agriculture, but the long-term fate of fertilizer-derived nitrogen in the plant–soil–water system is not fully understood. This long-term tracer study revealed that three decades after application of isotopically labeled fertilizer N to agricultural soils in 1982, 12–15% of the fertil...
Article
Macroinvertebrate community distributions were investigated within the benthic and hyporheic zone of five groundwater-fed streams, on a floodplain terrace, in a glacierized catchment in Alaska, in summer 2008. The streams were characterized by a distinct gradient in environmental instability and provided an opportunity to determine whether the loca...
Chapter
Le contexte actuel des changements planétaires a conduit un nombre croissant d’Etats à adopter une politique environnementale volontariste (Vitousek et al. 1997; Loreau 2010a). Cette action politique s’est accompagnée d’un effort de synthèse au niveau scientifique pour englober la problématique de la biodiversité dans un contexte général en considé...
Article
a b s t r a c t The flow of chemical materials along spatial elements is a fundamental aspect of landscape ecology. The research renders indicators for water pollution, which are utile for functional water management and land use planning. Ecologists identify mechanisms of nutrients transfer and mitigate their environmental impacts using freshwater...
Article
Full-text available
The role of ferrous iron in the phosphorus cycle of an aquatic ecosystem is poorly understood because of a lack of suitable methods to quantitatively evaluate ferrous iron phosphorus (FIP) phases. Using sediments sampled from Fubao Bay of Dianchi Lake in China, a novel extraction method for FIP using 2,2'-bipyridine was explored. Total phosphorus a...