WorldCat Identities

De Wit, Rutger

Overview
Works: 27 works in 42 publications in 2 languages and 131 library holdings
Genres: Academic theses 
Roles: Author, Thesis advisor, Other, Opponent, Author of introduction, Editor
Classifications: QH541.5.W3, 553.7
Publication Timeline
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Most widely held works by Rutger De Wit
Chapter Lake La Salada de Chiprana (NE Spain), an Example of an Athalassic Salt Lake in a Cultural Landscape by Rutger De Wit( )

2 editions published in 2016 in Undetermined and English and held by 41 WorldCat member libraries worldwide

On a global scale, athalassic inland salt lakes are abundant, albeit restricted to semiarid and arid climates. La Salada de Chiprana is unique in Western Europe, because it is a permanent and relatively deep (up to 5.6 m) hypersaline lake (40-90 g total dissolved salt L-1) since 1700 AD. It forms part of a cultural landscape, which imposes a challenge for management. The aim of this paper is to describe the specific microbial biota and how they interacted with both animals and plant species during the last 25 years. The deeper parts regularly showed salinity stratification with an anoxic sulfide-rich hypolimnion and a bloom of green sulfur bacteria (Prosthecochloris aestuarii and Chlorobium vibrioforme) at the pycnocline. Despite highly eutrophic conditions, often the top water layer is transparent due to top-down control of phytoplankton populations by the brine shrimp, Artemia parthenogenetica. This allows for the development of submerged aquatic vegetation of the endemic foxtail stonewort Lamprothamnium papulosum var. papulosum f. aragonense, and microbial mat communities build by the cyanobacterium Coleofasciculus (Microcoleus) chthonoplastes coexisting with green filamentous nonsulfur bacteria (Chloroflexaceae). The microbial mats show photosynthetically induced precipitation of high-Mg calcite, which by incorporating viruses represents a mechanism for their fossilization
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 27 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
Interactions between phototrophic bacteria in marine sediments by Rutger de Wit( Book )

8 editions published in 1989 in English and Undetermined and held by 21 WorldCat member libraries worldwide

Biodiversity of Coastal Lagoon Ecosystems and Their Vulnerability to Global Change by Rutger de Wit( )

2 editions published in 2011 in English and held by 4 WorldCat member libraries worldwide

Biodiversity of Coastal Lagoon Ecosystems and Their Vulnerability to Global Change
Ecophysiologie expérimentale des bactéries phototrophes sulfo-oxydantes dans les systèmes sédimentaires by Astrid Massé( )

2 editions published between 2002 and 2006 in French and held by 3 WorldCat member libraries worldwide

Les bactéries photoptrophes anoxygéniques sulfo-oxydantes prolifèrent dans les écosystèmes aquatiques peu profonds. Dans ce travail, nous étudions l'écophysiologie de ces micro-organismes dans des systèmes submergés par une colonne d'eau de profondeur supérieure à 1 mètre. Dans ce cas, la colonne d'eau absorbe les rayons proches de l'infrarouge (IR) de telle sorte que l'intensité lumineuse à la surface du sédiment est amoindrie et le spectre lumineux majoritairement constitué de longueurs d'ondes proches du visible. Ces conditions sont alors critiques pour la croissance des Chlorobiaceae et des Chromatiaceae. La culture en sédiment artificiel de Prosthecochloris aestuarii (Chlorobiaceae) a mis en évidence une hétérogénéité spatiale des conditions limitantes pour la photosynthèse et la croissance. De plus, cette souche bactérienne est capable de réagir à l'addition de rayons IR. La culture en sédiment artificiel, d'un biofilm mixte de P. aestuarii et de Thiocapsa roseopersicina (Chromatiaceae) a montré que les micro-organismes coexistent à la même profondeur. Les interactions entre les deux souches bactériennes sont positives pour la bactérie verte dont la biomasse est nettement supérieure comparée à celle estimée en culture axénique. Aucun effet de la coculture n'a été démontré sur T. roseopersicina. Enfin, les adaptations pigmentaires de deux souches de bactéries vertes, P. aestuarii et Chlorobium phaeobacteroides, ont été étudiées à différentes intensités de lumière verte simulant différentes profondeurs de la colonne d'eau. La réponse adaptative est propre à chaque espèce étudiée. Chez P. aestuarii, une seule forme de bactériochlorophylle c estérifiée avec le farnesyl est présente. Chez C. phaeobacteroides, la bactériochlorophylle e comprend une grande quantité de formes de bactériochlorophylle e estérifiées avec des alcools à chaîne linéaire et isoprénoides dont la proportion varie avec l'intensité lumineuse
Lake La Salada de Chiprana (NE Spain), an Example of an Athalassic Salt Lake in a Cultural Landscape by Rutger De Wit( )

1 edition published in 2016 in English and held by 3 WorldCat member libraries worldwide

On a global scale, athalassic inland salt lakes are abundant, albeit restricted to semiarid and arid climates. La Salada de Chiprana is unique in Western Europe, because it is a permanent and relatively deep (up to 5.6 m) hypersaline lake (40-90 g total dissolved salt L-1) since 1700 AD. It forms part of a cultural landscape, which imposes a challenge for management. The aim of this paper is to describe the specific microbial biota and how they interacted with both animals and plant species during the last 25 years. The deeper parts regularly showed salinity stratification with an anoxic sulfide-rich hypolimnion and a bloom of green sulfur bacteria (Prosthecochloris aestuarii and Chlorobium vibrioforme) at the pycnocline. Despite highly eutrophic conditions, often the top water layer is transparent due to top-down control of phytoplankton populations by the brine shrimp, Artemia parthenogenetica. This allows for the development of submerged aquatic vegetation of the endemic foxtail stonewort Lamprothamnium papulosum var. papulosum f. aragonense, and microbial mat communities build by the cyanobacterium Coleofasciculus (Microcoleus) chthonoplastes coexisting with green filamentous nonsulfur bacteria (Chloroflexaceae). The microbial mats show photosynthetically induced precipitation of high-Mg calcite, which by incorporating viruses represents a mechanism for their fossilization
Biomarqueurs pigmentaires dans les estuaires macrotidaux européens by Emmanuelle Lemaire( )

2 editions published between 2002 and 2006 in French and held by 3 WorldCat member libraries worldwide

L'importance du rôle tampon des estuaires, interfaces majeures entre continents et océans, et leur capacité de filtre restent des caractéristiques dominantes de ces écosystèmes. Notre apport à l'étude de ces systèmes est de mieux cerner l'origine et le devenir de la matière organique (MO). Tout estuaire reçoit la M® apportée directement par le fleuve et par la mer, mais également produit sa propre matière dans sa partie centrale et récolte celle des zones humides et de ses berges, ceci sans compter sur l'apport anthropique des eaux usées. De plus, l'importance relative de ces différentes sources peut varier dans le temps et l'espace en fonction des caractéristiques propres de l'estuaire. Nous avons choisi dans cette étude de suivre la MO végétale et les pigments photosynthétique comme marqueurs de cette matière. La technique HPLC (High Performance Liquid chromatography, Chromatographie Liquide Haute Pression) du contenu pigmentaire des échantillons, permet en une seule analyse d'obtenir des informations sur les classes phytoplanctoniques, mais aussi sur leur état de dégradation et le régime trophique du milieu. Ainsi dans les estuaires européens investigués, la population phytoplanctonique dominante tout au long de l'année est composée de Diatomées. Le printemps et l'été sont les périodes les plus productives où la diversification pigmentaire est la plus forte. En effet, nous avons trouvé des populations importantes de Dinoflagellés, Cryptophytes, Chlorophytes dans la Gironde (F), l'Escaut (B/NL), le Sado (P) et la Loire (F) mais aussi des Prymnesiophytes dans le Rhin (NL) et le Douro (P). L'autre question soulevée par cette étude est de préciser le mode de dégradation de la MO et les paramètres qui influence cette dégradation lorsque la MO pénètre dans la zone de maximum de turbidité de l'estuaire de la Gironde. Nous avons travaillé sur la matière organique d'origine phytoplanctonique par une technique d'incubation in vitro. Cette technique nous a permis de faire varier des paramètres comme : les teneurs en matière en suspension et en bactéries attachées, la température [etc...]
La croissance du biofilm photosynthétique : un indicateur du statut trophique des rivières by Clara Othoniel( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

À l'heure actuelle, les outils permettant d'Évaluer le statut trophique des eaux sont inappropriÉs pour les milieux lotiques. La bibliographie montre que les relations entre la quantitÉ de biofilm dÉveloppÉ par unitÉ de surface de support et les teneurs en nutriments des eaux ne sont pas significatives et ne permettent pas l'Établissement de modÈles prÉdictifs de quantitÉ de biomasse algale. Ce constat nous A incitÉs À analyser les liens entre la qualitÉ de l'eau et la dynamique de croissance des biofilms, À travers leur taux de croissance. Nous avons ÉtudiÉ dans quelle mesure cette relation pouvait Être intÉgrÉe À un outil de diagnostic du niveau d'enrichissement des cours d'eau. Cette Étude comporte deux volets : une approche en laboratoire, avec production de biofilm en conditions maÎtrisÉes et une approche in situ, avec l'immersion en riviÈres de supports de colonisation de biofilm. Le travail en canaux expÉrimentaux montre que le taux de croissance du biofilm est une fonction linÉaire des teneurs en PO43- (facteur limitant) sur une gamme de concentrations identifiÉe de 0 à 0,09 mg P-PO43-.L-1 (teneurs d'UN environnement moyennement polluÉ). Avec des concentrations supÉrieures, il semble que l'on atteigne les niveaux de concentrations saturantes et le taux de croissance n'est plus influencÉ par les teneurs en PO43-, ce qui implique qu'il n'est alors plus possible de discriminer deux situations trophiques distinctes. Les résultats obtenus in situ soulignent, d'une part, la difficultÉ de la mise en Évidence d'une relation claire entre le compartiment biologique et la qualitÉ du milieu, du fait de la trÈs grande sensibilitÉ du biofilm envers l'ensemble des conditions naturelles et, d'autre part, la nécessitÉ d'un Échantillonnage de biomasse À un pas de temps trÈs resserrÉ. Du point de vue qualitatif, les caractÉristiques de N-hÉtÉrotrophie des CommunautÉs diatomiques ont permis de diffÉrencier des situations trophiques fortement contrastÉes sans Être gÉnÉralisables À l'ensemble des cas étudiÉs
Microbial diversity in the Bassin d'Arcachon coastal lagoon (SW France) by Rutger de Wit( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Growth and metabolism of the purple sulfur bacterium Thiocapsa roseopersicina under combined light/dark and oxic/anoxic regimens by Rutger de Wit( )

1 edition published in 1990 in English and held by 2 WorldCat member libraries worldwide

Research and management for the conservation of coastal lagoon ecosystems : South-North comparisons by Rutger De Wit( Book )

3 editions published between 2009 and 2010 in English and held by 2 WorldCat member libraries worldwide

Short-term interactions between phytoplankton and intertidal seagrass vegetation in a coastal lagoon (Bassin d'Arcachon, SW France) by Rutger de Wit( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Irradiance Regulation of Photosynthesis and Respiration in Modern Marine Microbialites Built by Benthic Cyanobacteria in a Tropical Lagoon (New Caledonia) by Olivier Pringault( )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

Effect of light quality on sulfide photo-oxidation and growth in an artificial biofilm of the green sulfur bacterium Prosthecochloris aestuarii by Astrid Massé( )

1 edition published in 2002 in English and held by 2 WorldCat member libraries worldwide

Research and management for the conversation of coastal lagoon ecosystems( Book )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Submerged benthic macrophytes in Mediterranean lagoons: distribution patterns in relation to water chemistry and depth by Ines Le Fur( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Étude des effets et du rôle des herbiers à Zostera noltii sur la biogéochimie des sédiments intertidaux by Marie Lise Delgard( )

1 edition published in 2013 in French and held by 1 WorldCat member library worldwide

The aim of this study was to improve our understanding of the influence of the Zostera noltii meadows of the Arcachon Bay, a seagrass meadow affected by a severe regression since the 2000's, on the biogeochemical dynamic of the intertidal sediment of this lagoon. In such a changing coastal environment, it was important to characterize this influence on a wide range of spatial (i.e. from roots to the ecosystem) and temporal scales(i.e. tidal, diurnal, seasonal and inter-annual). In situ voltammetric measurements of the composition of porewater in an intertidal unvegetated sediment showed that (i) the vertical distribution of reduced species varied with tides and (ii) the oxygen dynamic in response to tidal and diurnal cycles was controlled by the photosynthetic activity and vertical migrations of microphytobenthos.The study of the influence of seagrasses on this dynamic by radial oxygen loss around roots was initiated with measurements of oxygen concentrations inside the lacunae of these plants. The organization of the lacunae of Zostera noltii is presented for the first time inthis study. The vertical distribution of porewater nutrients in vegetated and unvegetated sediments was characterized during the growth period of seagrasses. The presence of Zostera noltii induced a strong vertical zonation related to the depth-evolution of the balance between nutrient production stimulated by the root exudation of labile organic matter (source) and the root uptake of nutrients (sink). This study revealed the occurence of a root uptake of dissolved inorganic carbon and dissolved silica. Measurements of benthic oxygen exchanges on sediments colonized or not by Zostera noltii enabled the characterization of the seasonality and spatial heterogeneity of benthic metabolism (respiration and gross primary production) related to macrofaunal and macrophytic distribution. In vegetated sediments, the spatio-temporal variability of this benthic metabolism was highly controlled by leaves biomass. At the lagoon scale, our calculations showed that the regression of Zostera noltii meadows induced a significant decresase of mean annual respiration and production rates of the intertidal area of the lagoon.The inter annual evolution of the biogeochemistry of sediments colonized by Zostera noltii was studied in 2006 and in 2010/2011 in an area of the Arcachon Bay highly affected by the seagrass decline. In contrast to the healthy meadow in 2006, the declining meadow has increased nutrient release in sediments stimulating the production of ammonium or the dissolution of particulate phosphorus. This study shows that seagrass decay may result in a significant supply of phosphorus to the water column of a magnitude comparable to annual inputs to the lagoon from the rivers and the tidal pump
Exploration and study of the impact of climate change on microbial mats in the Nouvelle-Aquitaine region by Camille Mazière( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

The Intergovernmental Panel on Climate Change (IPCC, 2014) predicts that marine ecosystems will face many environmental pressures by 2100, in particular ocean acidification and warming. In coastal areas, microbial mats play key roles in the transformation of organic matter and the dynamics of biogeochemical cycles. The impacts of climate change on marine ecosystems have been widely studied at the global level but very little at the local level. They are particularly poorly understood in the Nouvelle-Aquitaine region (France). It is essential to understand the structural and functional modifications and dynamics of microbial communities in response to climate change. This thesis aims to define the impact of ocean warming and acidification on the microbial mats of Ré Island. First, a study of this microbial structure was perfomed in situ, in several types of salt marshes and according to the seasons, allowing to select the most suitable area to collect microbial mat and the season of sampling. The selected microbial mats were then maintained in mesocosms at laboratory. An increase in water temperature and a decrease in water pH were simulated for 8 weeks according to the most pessimistic predictions (RCP8.5) of the IPCC (2014) for 2100. Daily monitoring of physical-chemical parameters and weekly sampling of the microbial mat were performed to follow the functional dynamics and characterise the diversity changes. Acidification impacted the diversity and functioning of the microbial mats, particularly on the phototrophic communities. It has contributed to a decrease in prokaryotic diversity and an increase in some archaea that parasitise other archaea. The warming of the water had rather an effect on eukaryotic communities, with a change in Chlorophyceae and Diatomea abundance. The combination of these two conditions had less impact than the conditions alone suggesting a mitigating effect between them. However, in their current natural environment, these microbial mats already face temperatures higher or equal to those simulated, which is not the case for the pH reaching a final value of 7.6. Thus, these microorganisms are certainly already adapted and resilient to the simulated temperature, explaining little impact observed with this parameter, whereas acidification affects were more visibles
Identification et évaluation des services écosystémiques rendus par les habitats coralligènes by Laure Thierry de Ville d'Avray( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

The Mediterranean basin is recognized as a "hotspot" of biodiversity subjected to strong anthropic pressures. In the marine domain, coralligenous habitats greatly contribute to the basin's biodiversity and their coastal location makes them accessible to humans. The thesis attempts to identify and economically evaluate some of those ecosystem services. I used the concept of \textit{ecosystem service} at a local scale, focusing on the Bay of Marseille (anthropized) and the Port-Cros national park (under minimal human pressure). The first part of the thesis deals with the identification and description of the services rendered by coralligenous habitats in the study areas. The second part of the thesis describes the provisionning services through the application of the concept of ecosystem service cascade as developed by Haines-Young and Potschin. This approach helps to identify the elements and functions of the ecosystem involved in each service, the human beneficiaries and the types of economic benefits associated with the services. This chapter also proposes variables to measure each level of the cascade. The third part of the thesis deals with an analysis of the relationship between the presence of coralligenous habitat and the frequency of dives in the Bay of Marseille. The last part of the thesis employs the method of discrete choices experiment to study the declared preferences in the study areas of Marseille and Port-Cros concerning the services rendered by the coralligenous habitats. This analysis provided insight into how preferences can evolve as initial knowledge is enhanced through the provision of additional information
 
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Alternative Names
De Wit, Rutger.

Wit, Rutger de

Languages
English (22)

French (10)