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Alissar Abdel Latif Cheaib

Assistant professor
Life & Earth Sciences department - Section IV - Zahle
Speciality: Biology
Specific Speciality: Ecologie végétale - physiologie végétale - Géologie

Teaching 7 Taught Courses
(2015-2016) B1101 - Botanique, Reproduction Végétale

BS CSVT (C: Chemistry, Biochemistry, SVT: Life Science and Earth, Geology)

(2015-2016) B1101 - Botanique, Reproduction Végétale

BS CSVT (C: Chemistry, Biochemistry, SVT: Life Science and Earth, Geology)

(2015-2016) B1103 - Ecologie, Géologie

BS CSVT (C: Chemistry, Biochemistry, SVT: Life Science and Earth, Geology)

(2015-2016) B1103 - Ecologie, Géologie

BS CSVT (C: Chemistry, Biochemistry, SVT: Life Science and Earth, Geology)

(2015-2016) Biol 211 - General Geology

BS Earth and life sciences

(2015-2016) Biol 326 - General Ecology

BS Earth and life sciences

(2015-2016) Biol 346 - General Ecology Lab

BS Earth and life sciences

Education
2007 - 2012: Postdoctoral Fellowship

Ecology, Systematic and Evolution Unit - National Center of Scientific Research (CNRS) - University of Paris11 Sud, Orsay, France
Climate change, plant ecology

2006 - 2006: Master of Technical and Scientific Communication and Journalism

University Michel Montaigne Bordeaux 3, Institute of information and communication sciences, France
Science communication and journalism

Master 2

2002 - 2006: PhD in plant ecology

University of Bordeaux 1, French National Institute for Agricultural Research – Bordeaux - France
Climate change, plant physiology, plant ecology, evolutionary ecology, modelling climate change impacts on terrestrial biomes, biodiversity

Très honorable

2001 - 2002: Master of Science in Environmental Biogeochemistry

Pierre and Marie Curie University Paris VI, France
Soil, plant

Master 2

2000 - 2001: Master of Science in Geology and Human Paleontology Science

Department of Prehistory, National Museum of Natural History, Paris, France
Paleontology, prehistory, geology

Master 2

1996 - 1999: Bachelor of Natural Science

Faculty of Sciences, Lebanese University Hadath, Lebanon
Biology, Geology

Publications 3 publications
Nicolas K. Martin-StPaul, Marc Stephanon, Christophe Francois , Kamel Soudani , Eric Dufrêne , Phillipe Drobinski, Alissar Cheaib, Julien Ruffault, Serge Rambal, Florent Mouillot, and Paul Leadley Assessing the effect of spatial resolution of regional climate downscaling on the productivity and distribution of three widespread tree species over France EGU General Assembly 2013, held 7-12 April, 2013 in Vienna, Austria, id. EGU2013-12675 2013

The recent increases in temperature and water deficit as a result of climate changes have already impaired forest functioning and might trigger tree dieback worldwide in the near future. The assessment of future forest conditions relies on mechanistic models that predict changes in trees and forest functioning as a function of meteorological drivers. Currently, global and regional models (GCM and RCM) are the main providers of climate forcing in impact studies. One large uncertainty when forecasting the forest functioning is associated with the coarse spatial resolution of climate scenarii. In this study we assessed how the spatial resolution in climate forcing provided by the RCM WRF impacted the simulated productivity and distribution of three species (Fagus sylvatica, Quercus ilex) over France. We ran the forest model CASTANEA over France (that simulates fluxes of carbon and water and forest growth) using the output of WRF at different spatial scales (50 km, 20km, 8km and 1km) as forcing climate entries

Alissar CHEAIB., Badeau, V., Boe, J., Chuine, I., Delire, C., Dufrêne, E., François, C., Gritti, E. S., Legay, M., Pagé, C., Thuiller, W., Viovy, N. and Leadley, P Climate change impacts on tree ranges: model intercomparison facilitates understanding and quantification of uncertainty Ecology Letters 2012

Model-based projections of shifts in tree species range due to climate change are becoming an important decision support tool for forest management. However, poorly evaluated sources of uncertainty require more scrutiny before relying heavily on models for decision-making. We evaluated uncertainty arising from differences in model formulations of tree response to climate change based on a rigorous intercomparison of projections of tree distributions in France. We compared eight models ranging from niche-based to process-based models. On average, models project large range contractions of temperate tree species in lowlands due to climate change. There was substantial disagreement between models for temperate broadleaf deciduous tree species, but differences in the capacity of models to account for rising CO2 impacts explained much of the disagreement. There was good quantitative agreement among models concerning the range contractions for Scots pine. For the dominant Mediterranean tree species, Holm oak, all models foresee substantial range expansion.

Alissar Cheaib et al. Interactive effects of phosphorus and light availability on early growth of maritime pine seedlings Annals of Forest Science 2005

We examined the response of early growth of maritime pine seedlings to combined levels of light and phosphorus. Seedlings were grown under three levels of phosphorous availability, i.e., two relative addition rates (RAR = 2 and 4 g P (100 g-1)P d-1) and a free-access to P, crossed with two light levels (photosynthetic photon flux densities of 150 and 450 mmol m-2 s-1, respectively). Relative growth rate (RGR) and relative uptake rate of phosphorus (RUR) were computed, as well as the amount of light absorbed per seedling. We found that phosphorus and light acted as limiting factors with a complex interaction. Under low light and at the lowest P level, P and light were co-limiting, i.e., growth was enhanced only when P and light were increased together. Light was the limiting factor for growth under low light conditions at all other levels of P availability. P was the limiting factor at a RAR of 2% under high light. Enhancing P from 4% to free access did not significantly improve growth under high light. RUR was controlled systematically by P availability at 2 and 4% RAR. RGR values were close to RUR values except under free access to P. Therefore, growth-independent accumulation of P was observed under high P conditions. The differences in biomass production among P treatments were explained primarily by the reduced amount of radiation intercepted by the seedlings as a consequence of their reduced leaf area. No effect of P treatments were observed on the calculated radiation-use efficiency (RUE), which was found to be larger under low light. This confirms that pine seedlings adjust to moderate phosphorus deficiency mainly by changing their morphology (leaf area, dry-mass partitioning) while biochemical and photochemical limitations of photosynthesis play only a very secondary role.

Languages
English

Professional working proficiency

French

Full professional proficiency