David Sebag
Biographic Data
| ID | 4455963 |
|---|---|
| NAME | David Sebag |
| GIVEN NAMES | David |
| FAMILY NAME | Sebag |
| SIGNATURE | SEBAG D |
| AFFILIATIONS | IFP Énergies nouvelles |
| ORCID | 0000-0002-6446-6921 |
| VERIFIED | Yes |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 6 |
| AUTHOR COUNT | 13 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2009 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 1 |
Depositional environments in a prehistoric lakeshore settlement – a multi-proxy study of a stratigraphic sequence of the Neolithic lakeside settlement Zug-Riedmatt (Switzerland)
This research project investigates the depositional and settlement dynamics of the Late Neolithic pile dwelling site of Zug-Riedmatt in Central Switzerland, dated between 3200 and 3050 BCE. Using an interdisciplinary, microarchaeological approach, 14 stratigraphic units at one reference profile (Ref1) covering e complete stratigraphic sequence of the excavation site, were analysed using six disciplines: micromorphology, pollen analysis, palynofac…
Erosion of community complexity increases temperature-dependency of microbial respiration, but not growth, in short-term incubations
Biodiversity loss and climate change are 2 of the most alarming threats to ecosystem functioning and stability. These factors are, however, typically investigated separately, overlooking potential interactions between species extinctions and climate change on ecosystems. Here, we evaluated how different temperature regimes impact the relationship between microbial diversity and ecosystem functioning, in terms of temperature sensitivity of carbon …
Short-term modifications in the chemical structure of wood charcoals: Implications for anthracological investigations
Archaeological wood charcoals offer a unique window to study paleoclimates through their 13C isotope composition (δ13C) provided that (i) past heating temperatures are assessed to correct δ13C modifications related to carbonisation, and (ii) they have not been modified by post-depositional processes occurring in soil after their formation. Our goal was to assess how post-depositional processes can modify (i) the determination of past heating temp…
Rubber, rubber and rubber: How 75 years of successive rubber plantation rotations affect topsoil quality
Rubber tree plantations ( Hevea brasiliensis ) cover large areas in the tropics. In historical producing regions like South Thailand, rubber has been planted by smallholders for three successive rotations lasting a total of 75 years. Despite possible consequences on topsoil, the long‐term impacts of repeated rubber plantations on soil quality remain unknown. This study aims to better understand how various factors linked to long‐term rubber land …
Preuve archéologique de l’augmentation et de l’effondrement de la population entre ~2500 et ~500 ans cal. BP en Afrique centrale occidentale: Version abrégée en français
Des études paléoenvironnementales antérieures ont montré que des changements majeurs de la végétation et de l’environnement se sont produits en Afrique centrale à partir de l’Holocène moyen (ex. Maley & Brenac 1998). Plusieurs d’entre elles mettent en évidence une origine humaine et supposent que les grandes migrations de population, les innovations techniques (par exemple, la technologie de la fonte du fer) et/ou de nouveaux choix dans les prati…
Establishment and functioning of the savanna marshes of the Lopé National Park in Gabon since the termination of the African humid period and the arrival of humans 2500 years ago
Holocene paleoecological studies in tropical Africa are rare because most lakes either dried out at the termination of the African Humid Period or have since filled up. However, tropical sedge marshes can be an alternative to perform long-term ecological studies. The Lopé National Park (LNP) in Gabon is a mosaic of forest and savanna enclosed in the equatorial forest, where open areas facilitated the development of peat marshes accumulating sever…
An integrated approach for tracking climate-driven changes in treeline environments on different time scales in the Valle d’Aosta, Italian Alps
Both biotic and abiotic components, characterizing the mountain treeline ecotone, respond differently to climate variations. This study aims at reconstructing climate-driven changes by analyzing soil evolution in the late Holocene and by assessing the climatic trends for the last centuries and years in a key high-altitude climatic treeline (2515 m a.s.l.) on the SW slope of the Becca di Viou mountain (Aosta Valley Region, Italy). This approach is…
Archaeological Evidence for Population Rise and Collapse between ~2500 and ~500 cal. yr BP in Western Central Africa
Des études paléoenvironnementales antérieures ont montré que des changements majeurs de la végétation et de l’environnement se sont produits en Afrique centrale à partir de l’Holocène moyen (ex. Maley & Brenac 1998). Plusieurs d’entre elles mettent en évidence une origine humaine et supposent que les grandes migrations de population, les innovations techniques (par exemple, la technologie de la fonte du fer) et/ou de nouveaux choix dans les prati…
L’émergence de l’agriculture: Révolution ou grande transition de l’Anthropocène
L’introduction de l’agriculture en Europe, souvent appelée « Révolution néolithique », suggère une « grande transition » analogue à celle que nous expérimentons aujourd’hui : un changement complexe, profond et rapide des sociétés et de leur environnement. Toutefois, le scénario de néolithisation de l’Europe, souvent simplifié, est loin d’être généralisable aux autres régions du monde, et notamment aux régions intertropicales. Si l’on prend en com…
Vers une écologie historique de la forêt d’Afrique centrale
L’archéologie a été lente à se développer dans les régions intertropicales mais elle connaît aujourd’hui une dynamique soutenue par des communautés de chercheurs mieux structurées et plus actives, une volonté politique d’appropriation d’un patrimoine parfois négligé et des projets d’aménagement de plus en plus souvent couplés à des fouilles préventives. La rencontre de l’archéologie, de l’écologie et de l’anthropologie intertropicales, notamment …
Analyse de l’organisation spatiale de deux sites de production du fer dans le Sud-Ouest du Niger
Dans la région du Sud-Ouest du Niger, des bas fourneaux à usage unique ont été identifiés lors d’une prospection archéologique. À Saga Gorou, dans les environs de Niamey, un inventaire exhaustif de 4 504 bas fourneaux permet de proposer une analyse spatiale au sein d’un bassin versant, de 32 km2, représentatif du paysage sahélien. Les sites métallurgiques de Bilfouda et de Garbel ont les plus fortes concentrations de bas fourneaux. Chacun d’eux a…
Coupled Rock-Eval pyrolysis and spectrophotometry for lacustrine sedimentary dynamics: Application for West Central African rainforests (Kamalété and Nguène lakes, Gabon)
In recent years, Nguène Lake and Kamalété Lake (Gabon, West Central Africa) have been studied repeatedly, providing comprehensive reconstructions of environmental changes over the last millennia. Both lakes are in different geomorphological and environmental settings. They are therefore excellent sites to test new methodological approaches. Indeed, the sedimentary cores provide various facies, and the previous studies provide references for calib…
Holocene evolution of a wetland in the Lower Seine Valley, Marais Vernier, France
Estuaries like that of the Seine River in NW Europe developed in incised fluvial valleys after the last glacial maximum. Since the 1940s, several authors have studied the largest wetland of the Seine estuary, the Marais Vernier, to understand depositional environments during Holocene infilling. We reinterpret previous research based on new and published data (for example fill thickness and material source) to (1) describe facies and depositional …
Archaeological Evidence for Population Rise and Collapse between ~2500 and ~500 cal. yr BP in Western Central Africa
Des études paléoenvironnementales antérieures ont montré que des changements majeurs de la végétation et de l’environnement se sont produits en Afrique centrale à partir de l’Holocène moyen (ex. Maley & Brenac 1998). Plusieurs d’entre elles mettent en évidence une origine humaine et supposent que les grandes migrations de population, les innovations techniques (par exemple, la technologie de la fonte du fer) et/ou de nouveaux choix dans les prati…
Coupled Rock-Eval pyrolysis and spectrophotometry for lacustrine sedimentary dynamics: Application for West Central African rainforests (Kamalété and Nguène lakes, Gabon)
In recent years, Nguène Lake and Kamalété Lake (Gabon, West Central Africa) have been studied repeatedly, providing comprehensive reconstructions of environmental changes over the last millennia. Both lakes are in different geomorphological and environmental settings. They are therefore excellent sites to test new methodological approaches. Indeed, the sedimentary cores provide various facies, and the previous studies provide references for calib…
Holocene evolution of a wetland in the Lower Seine Valley, Marais Vernier, France
Estuaries like that of the Seine River in NW Europe developed in incised fluvial valleys after the last glacial maximum. Since the 1940s, several authors have studied the largest wetland of the Seine estuary, the Marais Vernier, to understand depositional environments during Holocene infilling. We reinterpret previous research based on new and published data (for example fill thickness and material source) to (1) describe facies and depositional …
Holocene evolution of a wetland in the Lower Seine Valley, Marais Vernier, France
Estuaries like that of the Seine River in NW Europe developed in incised fluvial valleys after the last glacial maximum. Since the 1940s, several authors have studied the largest wetland of the Seine estuary, the Marais Vernier, to understand depositional environments during Holocene infilling. We reinterpret previous research based on new and published data (for example fill thickness and material source) to (1) describe facies and depositional …
Analyse de l’organisation spatiale de deux sites de production du fer dans le Sud-Ouest du Niger
Dans la région du Sud-Ouest du Niger, des bas fourneaux à usage unique ont été identifiés lors d’une prospection archéologique. À Saga Gorou, dans les environs de Niamey, un inventaire exhaustif de 4 504 bas fourneaux permet de proposer une analyse spatiale au sein d’un bassin versant, de 32 km2, représentatif du paysage sahélien. Les sites métallurgiques de Bilfouda et de Garbel ont les plus fortes concentrations de bas fourneaux. Chacun d’eux a…
Coupled Rock-Eval pyrolysis and spectrophotometry for lacustrine sedimentary dynamics: Application for West Central African rainforests (Kamalété and Nguène lakes, Gabon)
In recent years, Nguène Lake and Kamalété Lake (Gabon, West Central Africa) have been studied repeatedly, providing comprehensive reconstructions of environmental changes over the last millennia. Both lakes are in different geomorphological and environmental settings. They are therefore excellent sites to test new methodological approaches. Indeed, the sedimentary cores provide various facies, and the previous studies provide references for calib…
Vers une écologie historique de la forêt d’Afrique centrale
L’archéologie a été lente à se développer dans les régions intertropicales mais elle connaît aujourd’hui une dynamique soutenue par des communautés de chercheurs mieux structurées et plus actives, une volonté politique d’appropriation d’un patrimoine parfois négligé et des projets d’aménagement de plus en plus souvent couplés à des fouilles préventives. La rencontre de l’archéologie, de l’écologie et de l’anthropologie intertropicales, notamment …
L’émergence de l’agriculture: Révolution ou grande transition de l’Anthropocène
L’introduction de l’agriculture en Europe, souvent appelée « Révolution néolithique », suggère une « grande transition » analogue à celle que nous expérimentons aujourd’hui : un changement complexe, profond et rapide des sociétés et de leur environnement. Toutefois, le scénario de néolithisation de l’Europe, souvent simplifié, est loin d’être généralisable aux autres régions du monde, et notamment aux régions intertropicales. Si l’on prend en com…
Preuve archéologique de l’augmentation et de l’effondrement de la population entre ~2500 et ~500 ans cal. BP en Afrique centrale occidentale: Version abrégée en français
Des études paléoenvironnementales antérieures ont montré que des changements majeurs de la végétation et de l’environnement se sont produits en Afrique centrale à partir de l’Holocène moyen (ex. Maley & Brenac 1998). Plusieurs d’entre elles mettent en évidence une origine humaine et supposent que les grandes migrations de population, les innovations techniques (par exemple, la technologie de la fonte du fer) et/ou de nouveaux choix dans les prati…
Establishment and functioning of the savanna marshes of the Lopé National Park in Gabon since the termination of the African humid period and the arrival of humans 2500 years ago
Holocene paleoecological studies in tropical Africa are rare because most lakes either dried out at the termination of the African Humid Period or have since filled up. However, tropical sedge marshes can be an alternative to perform long-term ecological studies. The Lopé National Park (LNP) in Gabon is a mosaic of forest and savanna enclosed in the equatorial forest, where open areas facilitated the development of peat marshes accumulating sever…
An integrated approach for tracking climate-driven changes in treeline environments on different time scales in the Valle d’Aosta, Italian Alps
Both biotic and abiotic components, characterizing the mountain treeline ecotone, respond differently to climate variations. This study aims at reconstructing climate-driven changes by analyzing soil evolution in the late Holocene and by assessing the climatic trends for the last centuries and years in a key high-altitude climatic treeline (2515 m a.s.l.) on the SW slope of the Becca di Viou mountain (Aosta Valley Region, Italy). This approach is…
Archaeological Evidence for Population Rise and Collapse between ~2500 and ~500 cal. yr BP in Western Central Africa
Des études paléoenvironnementales antérieures ont montré que des changements majeurs de la végétation et de l’environnement se sont produits en Afrique centrale à partir de l’Holocène moyen (ex. Maley & Brenac 1998). Plusieurs d’entre elles mettent en évidence une origine humaine et supposent que les grandes migrations de population, les innovations techniques (par exemple, la technologie de la fonte du fer) et/ou de nouveaux choix dans les prati…
Rubber, rubber and rubber: How 75 years of successive rubber plantation rotations affect topsoil quality
Rubber tree plantations ( Hevea brasiliensis ) cover large areas in the tropics. In historical producing regions like South Thailand, rubber has been planted by smallholders for three successive rotations lasting a total of 75 years. Despite possible consequences on topsoil, the long‐term impacts of repeated rubber plantations on soil quality remain unknown. This study aims to better understand how various factors linked to long‐term rubber land …
Erosion of community complexity increases temperature-dependency of microbial respiration, but not growth, in short-term incubations
Biodiversity loss and climate change are 2 of the most alarming threats to ecosystem functioning and stability. These factors are, however, typically investigated separately, overlooking potential interactions between species extinctions and climate change on ecosystems. Here, we evaluated how different temperature regimes impact the relationship between microbial diversity and ecosystem functioning, in terms of temperature sensitivity of carbon …
Short-term modifications in the chemical structure of wood charcoals: Implications for anthracological investigations
Archaeological wood charcoals offer a unique window to study paleoclimates through their 13C isotope composition (δ13C) provided that (i) past heating temperatures are assessed to correct δ13C modifications related to carbonisation, and (ii) they have not been modified by post-depositional processes occurring in soil after their formation. Our goal was to assess how post-depositional processes can modify (i) the determination of past heating temp…
Depositional environments in a prehistoric lakeshore settlement – a multi-proxy study of a stratigraphic sequence of the Neolithic lakeside settlement Zug-Riedmatt (Switzerland)
This research project investigates the depositional and settlement dynamics of the Late Neolithic pile dwelling site of Zug-Riedmatt in Central Switzerland, dated between 3200 and 3050 BCE. Using an interdisciplinary, microarchaeological approach, 14 stratigraphic units at one reference profile (Ref1) covering e complete stratigraphic sequence of the excavation site, were analysed using six disciplines: micromorphology, pollen analysis, palynofac…
Geography (7 works) · Ecology (6 works) · Humanities (5 works) · Art (4 works) · Environmental Science (4 works) · Geology (4 works) · Holocene (4 works) · Archaeology (3 works) · Archaeology and ancient environmental studies (3 works) · Forestry (3 works)