Henri Decamps

Henri Decamps
Paul Sabatier University - Toulouse III | UPS Toulouse · Laboratoire d'Ecologie fonctionnelle et environnement - UMR 5245 - ECOLAB

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113
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Publications

Publications (113)
Chapter
Riparian zones extend from the edges of water bodies to upland communities in areas influenced by fresh water. Biodiversity is created and maintained by inherent nutrient, sediment and biogeochemical processes, variable energy and disturbance regimes, complex habitat, herbivory and other biotic processes. Riparian zones intercept and retain nutrien...
Article
For several years, measures to insure healthy river functions and to protect biodiversity have focused on management at the scale of drainage basins. Indeed, rivers bear witness to the health of their drainage basins, which justifies integrated basin management. However, this vision should not mask two other aspects of the protection of aquatic and...
Article
Full-text available
Landscape ecology studies the interactions between spatial patterning and ecological processes. It focuses on the causes and consequences of spatial heterogeneity, combining concepts and methods of geography and ecology. It comes within the framework of a landscape integrated approach. In this paper, we summarize some basic principles and focus on...
Article
1. Denitrification in floodplain soils is one of the main biological processes emitting and reducing nitrous oxide, a greenhouse gas, and the main process responsible for the buffering capacity of riparian zones against diffuse nitrate pollution. 2. The aim of this study was to measure denitrification rates under a wide range of current climatic co...
Article
SUMMARY1 Larvae of the ephemeropteran Thraulus bellus were sampled from the substrate interstices of a floodplain pond along the River Adour (south-west France). Quantitative sampling was carried out using traps arranged in five transects of four traps each, made up of five vertical compartments between +20 and -80cm from the surface of the substra...
Article
SUMMARY1 A review is presented of types of satellite remote-sensing data currently available, and their recent uses in studies of river systems.2 Broad-scale assessments of relative water quality may be carried out, although precise indication of water quality requires samples to be taken in situ.3 In the event of flooding, the extent of inundation...
Chapter
This chapter summarizes the life history strategies exhibited by riparian vegetation and provides descriptions of community structure. It illustrates how community assemblages typically vary across the catchment and through time, and analyzes biological diversity in terms of theory and actual patterns. Riparian plants have specific morphological, p...
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The biophysical complexity and the distinctive ecological functions of riparia depend on high levels of spatial and temporal connectivity among riparian habitat patches as well as between riparia and adjacent riverine and upland systems. This chapter examines the vectors connecting riparian components and the role of system connectivity in underpin...
Chapter
This chapter focuses on the geomorphic and biotic classifications of riparians from a hierarchic perspective, linking the physical environment to biotic characteristics. It discusses the hierarchical perspectives, the Rosgen classification, the process domain concept, and the hydrogeomorphic approaches. Biotic approaches to classification include s...
Chapter
This chapter focuses on riparian restoration, which reestablishes processes affecting banks, habitat diversity, fisheries, biodiversity, and the filtration of diffuse pollution. A reasonably natural hydrologic regime is essential to restore riparia, particularly the magnitude, frequency, and timing of peak flows to reconnect and periodically reconf...
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This chapter examines the major avenues and ecological consequences of human-mediated change, status and trends associated with major changes, ecological principles associated with responses to changes in flow regimes, and the environmental consequences of significant changes expected to occur due to changes in climate and land use. Anthropogenic d...
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This chapter explores the water use and fluxes, nutrient dynamics, production ecology of vascular plants, decomposition processes, strategies for information flow, and the maintenance of riparian microclimates and associated moisture gradients. Riparia possess an impressive array of functional attributes that are comparable to their great diversity...
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This chapter describes individual riparian characteristics with uses of riparian resources into a broad, holistic synthesis. It examines riparia as keystone components of catchments, reexamines their role as nodes of ecological organization, provides a unified perspective of the riparian ecology, explores approaches for developing a future vision o...
Chapter
Effective conservation of riparian systems is a difficult challenge as many of them are deeply influenced by human populations. Thus interdisciplinary approaches integrating human and natural sciences are required to preserve an appropriate balance between the health of resources and ecosystems and the health and quality of human life. Conservation...
Chapter
This chapter concentrates on the management of riparian resources and the ecological services provided by them. System-scale management of riparia is the process of making decisions regarding the use of land and water—practices affecting the entire organic ecosystem, and processes that characterize and comprise the system. The goals of riparian man...
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Full-text available
We present the research needs required to implement the European Framework Directive for Water, involving a better understanding of the ecosystem dynamics, a better knowledge of groundwater bodies, strong efforts in ecotoxycology and a new approach in water economics. To cite this article: P.-A. Roche et al., C. R. Geoscience 337 (2005).
Book
Publisher Summary This chapter describes the various geomorphic and hydrologic processes such as catchments that influence riparian system development and maintenance. Catchments are areas of the land surface in which all the runoff drains to a single point on a stream or river channel, and are bounded by drainage divides; catchments have been know...
Article
This book describes the underlying water conditions and geologies that support viable riparia, illustrates the ecological characteristics of riparia, and discusses how riparia are used by human cultures as well as how riparia can be used to sustain environmental quality. In recent years riparian management has been widely implemented as a means of...
Article
Research needs for the implementation of the water European Framework Directive. We present the research needs required to implement the European Framework Directive forWater, involving a better understanding of the ecosystem dynamics, a better knowledge of groundwater bodies, strong efforts in ecotoxycology and a new approach in water economics.
Article
Full-text available
In addition, during the program, several influential seminars led participants in Poland, and this publication in the Polish Journal of Ecology is symbolic of exceptional opportunities of links developed between researchers from the 24 participating countries. On the whole, 22 research projects were organised, and about 20 seminars were attended by...
Article
Public opinion values riparian woods due to their potential role in mitigating diffuse pollution along river course. However, a too exclusive focus on the buffer role of riparian woods may lead to neglect their most interesting property, multifunctionality. This property is considered with regards to the ecological dynamics of riparian systems and...
Article
Public opinion values riparian woods due to their potential role in mitigating diffuse pollution along river courses. However, a too exclusive focus on the buffer role of riparian woods may lead to neglect their most interesting property, multifunctionality. This property is considered with regards to the ecological dynamics of riparian systems and...
Article
At the beginning of the 1970s a study was carried out on over 300 lakes under the direction of OECD. Evidence was found of a relationship between available phosphorus, the type of lake and the biomass of phytoplankton in the lake. The findings gave some credibility to the concept that it might be possible to limit the development of algae by reduci...
Article
Au debut des annees 1970, une etude menee par l'OCDE sur plus de 300 lacs a mis en relation la quantite de phosphore disponible, la typologie des plans d'eau et la biomasse des algues du plancton. Ce resultat a accredite l'idee qu'on pouvait limiter les developpements d'algues en reduisant les apports de phosphore. L'experience acquise depuis montr...
Article
Landscape issues are of interest in many disciplines, but they are seldom seen as an opportunity for inter- or transdisciplinary cooperation. This limits the ability to account for real world complexity. Bridging human and natural sciences intends to foster and coordinate communication about landscape-related issues—within academia and between scie...
Article
If we consider riparian areas as landscapes it means that we consider them as entities whose survival depends on ecological as well as on cultural sustainability. Ecological sustainability requires people’s understanding of the role of both diversity and connectivity of riparian areas. Cultural sustainability requires people’s attention and care to...
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Full-text available
The restoration of floodplain woodlands demands an understanding of the linkages between process, form and past management history at both a local and catchment scale. Site and reach scale processes that influence the species composition of floodplain woodland species are described with a particular focus on the relationships between hydrological a...
Article
Spectral information on soil is not easily available as vegetation and farm works prevent direct observation of soil responses. However, there is an increasing need to include soil reflectance values in spectral unmixing algorithms or in classification approaches. In most cases, the impact of soil moisture on the reflectance is unknown and therefor...
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Full-text available
The interest in riparian zones have arisen, since the eighties, following the discovery of their potential role in mitigating diffuse nitrogen pollution. Indeed, it was found that they could reduce upslope fluxes of nitrate by the combination of two biological processes, i.e. plant uptake and denitrification. Due to their position between upland an...
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Full-text available
In this manuscript we investigated the relationshipsbetween the microbiological denitrification process inriver alluvial soils with structures and patterns ofthe floodplain visible at a larger scale. Wehypothesised that both topography and soil grain sizerepresent pertinent environmental factors to forecastdenitrification activity in river floodpla...
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Full-text available
The main impacts of riparian vegetation on hydrological processes are briefly reviewed in order to highlight needs and perspectives for research and management goals. This review is based upon three distinct influences of riparian vegetation on hydrological processes: (i) the control of runoff, i.e. the physical impact of living and dead plants on...
Article
Increasingly complex, global and unexpected environmental issues are likely to occur in the future. At the same time, citizens will become increasingly aware of the effects of these issues. These trends will require new ways of practicing and communicating research. It is crucial for landscape research to address this challenge at the beginning of...
Article
In large river floodplains, the high nutrient cycling capacity of floodplain soils, compared to that of upland ecosystems, is the consequence of energy and matter fluxes via flood deposits. These fluxes are under the control of local geomorphological features and the water regime. In this paper we illustrate how the geomorphological context of larg...
Article
This paper focuses on the effect of connectivity on biodiversity by proposing a testable hypothesis of a structural connectivity threshold. Evidence of this threshold is supported by percolation theory and by biological models of extinction. Hypothesizing the existence of this connectivity threshold, a conceptual model linking connectivity and biod...
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Full-text available
Riparian zones possess an unusually diverse array of species and environmental processes. The ecological diversity is related to variable flood regimes, geograph-ically unique channel processes, altitudinal climate shifts, and upland influences on the fluvial corridor. The resulting dynamic environment supports a variety of life-history strategies,...
Article
Patterns of plant species richness and community composition were studied in diverse riparian zones. Eight rivers in south-western France, one river in north-western USA and four rivers in south-eastern Spain were compared. A brief review is presented of factors that have been singled out as controlling diversity along rivers. The proportions of pl...
Article
Invasibility of riparian plant communities was estimated by the percentage of alien species found along the Adour River (Southwest France) and along Lockout Creek, McKenzie River, and Willamette River (Central Cascades, Oregon, U.S.A.). At the patch scale, the invasibilities of riparian plant communities were compared between one exceptionally rich...
Article
Changes in the hydrological regime affect the phenomenon of invasion by plant species along riparian systems. The dynamics of exotic (non-native) and native species were examined at five sites that differed in exposure to hydrological disturbance (floods) during three consecutive years (medium, wet and dry years). When considering the disturbance g...
Article
The character of riparian zones along river courses is explored. Choice of a conceptual model reflecting the processes thought to be important in controlling the patterns of species richness in riparian vegetation is discussed. The possibility of predicting species richness at different spatio-temporal scales is evaluated. -from Authors
Article
The paper discusses how variability of river margins interacts with riparian function at the landscape level, in order to develop inferences about the future of this interaction with respect to potential effects of a global climatic change. A riparian approach to the ecology of river landscapes should be useful in that it offers an opportunity to i...
Article
Full-text available
Riparian corridors possess an unusually diverse array of species and environmental processes. This @'ecological@' diversity is related to variable flood regimes, geomorphic channel processes, altitudinal climate shifts, and upland influences on the fluvial corridor. This dynamic environment results in a variety of life history strategies, and a div...
Chapter
The main challenges facing ecologists in the next decade are the creation of a landscape perspective among scientists, managers and policy-makers; determining the cumulative effects of land use practices; rehabilitating damaged ecosystems; designing management systems to accommodate natural variability; prudent conservation of natural systems; and...
Article
Riverine forests were studied in the River Garonne floodplain as sites of maximum interactions between a river and its valley. A historical perspective was used as an aid to explain present processes. In the floodplain the vegetation dynamics are still largely influenced by floods in contrast with other more industrialized European rivers. Intensiv...
Article
Two examples are given in order to illustrate how far Remote Sensing technology can be integrated into large river ecological studies. The first one concerns the over-populated deltaïc complex of the Ganges, in Bangladesh where annual floods have dramatic consequences. The second one has been selected along the Garonne River, in Southern France, wh...
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Full-text available
Boundaries separating adjacent resource patches are dynamic components of the aquatic landscape. This article addresses some fundamental questions about boundary structure and function in lotic ecosystems. We give examples of longitudinal and lateral boundaries associated with stream systems, demonstrate the application of chaos theory to understan...
Article
Conceptual models are proposed to explain nitrogen fluxes in the soils of riparian zones in relation to the different modalities of water logging and nitrate inputs. Non-submerged, temporarily submerged, and always submerged, sites are considered in both winter and summer. It is shown that capacities for epuration are elevated for nitrate loads fro...
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Full-text available
Man's influence, over the last three centuries, has gradually influenced the dynamics of forest cover along the valley of the Garonne, a seventh order river in Southern France. The vegetation cover of the floodplain depends on topographical levels which govern the frequency and duration of submergence during flooding. Along the valley, forest patch...
Article
Communities of nesting birds were studied in four distinct biotopes within the alluvial corridor of the River Garonne: 50 terrace woodlands, 17 riparian woodlands, one poplar plantation, and one slope woodland. A total of 400 stations were investigated, consisting of eight distinct classes of forest size for the terrace woodlands and four for the r...
Article
A numerical model has been developed to simulate the changes in phytoplankton biomass in a river. This model was tested on actual estimates obtained down a reach of the River Lot. The analysis of the behaviour of the model (sensitivity to parameters) and the actual results show that the development of phytoplankton is controlled 1) by variations in...
Article
Male and female genitalia of the Pyrenean species of Plectrocnemia (P. laetabilis, P. scruposa, P. conspersa, P. brevis and P. geniculata) are studied in detail. An identification key is provided.
Chapter
Hydroelectric development has brought about changes in many streams below dams, adding further to the disturbance caused earlier by construction of canals and weirs for navigation (Tourenq et al., 1978). The structure and function of these ecosystems stem directly from man’s modifications of the water flow. The consequences to hydrobiology are bein...
Article
In Guadeloupe, during a general survey on intestinal schistosomiasis, the authors made a structural analysis of a limited focus of infection. The focus is formed by a river basin on the Carribean coast of Basse-Terre island. Sampling of the various elements of the parasitic cycle was done in spatial units defined by ecological and epidemiological c...
Article
Photosynthesis rate ranged 136-919 mg C/m³/d and increase in biomass ranged 51-188 mg C/m³/d. Organic matter rapidly degrades. Only 20-25% of assimilated carbon returns to new biomass.-from Selected Water Resources Abstracts
Article
Des bilans amont-aval ont été réalisés sur le bief de Cajarc : réservoir artificiel de 3 km de long et 1 269 000 m3 sur la rivière Lot. Les paramètres suivants ont été étudiés sur des cycles de 24 heures pour différents débits : matières minérales et organiques en suspension, turbidité de l'eau, teneurs en pigments chlorophylliens, en nitrates, nit...
Article
The microdistribution of larvae and pupae of three species of Simuliidae (Odagmia variegata, O. obreptans and Simulium rupicolum) has been observed in different streams in the Pyrenees.These species occur where there is a high water velocity which, in the streams studied, was present in zones with a torrential discharge. We have not found them in z...
Article
The larvae of Drusus rectus and Anomalopterygella chauviniana are described and illustrated. A key is given to separate the larvae of the four Pyrenean species of the Drusinae: Drusus discolor, D. rectus, Ecclisopteryx guttulata, Anomalopterygella chauviniana. These species present a similar behaviour in oviposition, hatching, case building, larval...
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Full-text available
More than 90% of the invertebrates swept along at the inlet of the system remains trapped inside the subterranean environment. The most important input appears during the first days of the spate; it is the same with the total organic matter per litre of water. The large and medium particles of organic matter from the most abundant fraction at the i...
Article
A study was made of several populations of five species of Micrasema living in the mosses of Pyrenean streams.The life cycle of Micrasema morosum showed the greatest changes with altitude and took one, two or three years depending on altitude. The four other species of Micrasema had a life cycle of one year with a simple shift in the flight period...
Article
The problems of planning a sampling programme for extensive faunal surveys and intensive quantitative studies are discussed. Methods are given for describing a sample in statistical terms. The spatial dispersion of a population is discussed, and the basic types of spatial distribution are described. Methods are given to test if the dispersion of a...

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