Laurent LamarqueLaurent Lamarque

Position: Post-doctoral

 

Director : Esther Lévesque
Codirector : Daniel Fortier

 

Main Address
Département des Sciences de l’Environnement.
Université du Québec à Trois-Rivières,
3351 Boulevard des Forges.
Trois-Rivières, Québec.
G9A 5H7

Email : llamarqueab@gmail.com

 

Project Title

Permafrost-vegetation feedbacks in the context of climate warming and permafrost degradation

 

Description of the project research

There is much evidence that the Arctic tundra vegetation dynamic has rapidly changed in recent decades in response to climate warming, especially through increases in plant community composition and biomass, and woody species expansion. Several studies have, at the same time, documented that changing climate conditions also increase thermokarst development and thermo-erosion gullying. Consequences of permafrost degradation include changes in landscape hydrologic network, drainage conditions, sediments and nutrient fluxes, plant community composition, and greenhouse gas balance. In comparison, little is known about the feedback effects vegetation can have on the stabilization and the thermal and mechanical dynamics of permafrost terrains disturbed by thermo-erosion, and in turn, how permafrost stabilization changes active layer biogeochemical conditions and vegetation dynamics. Our aim is to understand (i) to what extent vegetation affects permafrost dynamics once disturbance such as thermo-erosion gullying has occurred, (ii) how permafrost reaches a new steady state, and (iii) whether stabilized gullies favor vegetation succession. The following questions are thus asked: (1) What are the vegetation succession stages that characterize the stabilization of permafrost terrains disturbed by thermo-erosion? (2) What are the impacts of these vegetation changes on the short and long-term active layer and upper permafrost thermal and mechanical dynamics? (3) Does the new vegetation-stabilized permafrost’s state differ from undisturbed permafrost terrains? (4) How do changes in moisture and nutrient conditions related to permafrost stabilization and aggradation impact the quality and composition of vegetation? (5) Are woody species able to colonize stabilized thermo-erosion gullies?

 

Keywords

Thermo-erosion gullying, plant community succession, climate warming, permafrost degradation

 

Scientific articles in peer-review journals & conferences

Perreault N, Levesque E, Fortier D, Lamarque LJ. Thermo-erosion gullies boost the transition from wet to mesic vegetation (submitted)

Merceron NR, Lamarque LJ, Delzon S, Porté AJ. Evaluating methods to control a locally dominant invasive tree, Acer negundo L. (submitted)

Lamarque LJ, Lortie CJ, Porté AJ, Delzon S (2015). Genetic differentiation and phenotypic plasticity in life-history traits between native and introduced range populations of invasive maple trees. Biological Invasions 17:1109-1122

Sotomayor DA, Lortie CJ, Lamarque LJ (2014). Nurse-plant effects on the seed biology and germination of desert annuals. Austral Ecology 39:786-794

Zenni RD, Lamy JB, Lamarque LJ, Porté AJ (2014). Adaptive evolution and phenotypic plasticity during naturalization and spread of invasive species: implications for tree invasion biology. Biological Invasions 16:635-644

Lamarque LJ, Porté AJ, Eymeric C, Lasnier J-B, Lortie CJ, Delzon S (2013). A test for pre-adapted phenotypic plasticity in the invasive tree Acer negundo L. PLoS ONE 8(9): e74239. doi:10.1371/journal.pone.0074239

Lamarque LJ, Delzon S, Sloan MH, Lortie CJ (2012). Biogeographical contrasts to assess local and regional patterns of invasion: a case study with two reciprocally introduced exotic maple trees. Ecography 35:803-810

Lamarque LJ, Porté AJ, Lortie CJ, Michalet R, Delzon S (2011). Invasive Acer negundo outperforms native species in non-limiting resource environments due to its higher phenotypic plasticity. BMC Ecology 11:28

Lamarque LJ, Delzon S, Lortie CJ (2011). Tree invasions: a comparative test of the dominant hypotheses and functional traits. Biological Invasions 13:1969-1989

Reid AM, Lamarque LJ, Lortie CJ (2010). A systematic review of the recent ecological literature on cushion plants: champions of plant facilitation. Web Ecology 10:44-49

 

Conference presentations

Merceron NR, Lamarque LJ, Brogniez S, Ducournau Y, Buyle S, Degrave L, Roudie J, Felis O, Moreau A, Vernin P, Guengant Y, Delzon S, Porté AJ (2014). Control of Acer negundo L.: insights from experimental and physiological studies. 4th International Symposium on Weeds and Invasive Plants, Montpellier, France

Lortie CJ, Sotomayor DA, Lamarque LJ (2014). A test for ecotypic differentiation in the competitive ability of beneficiary species found under nurse-plants and in open sites in arid systems. 99th ESA meeting, Sacramento, CA, USA

Lamarque LJ, Lortie CJ, Porté AJ, Delzon S (2012) A biogeographical study of the genetic adaptation and phenotypic plasticity of two invasive maple trees. NEOBIOTA, 7th European Conference on Biological Invasions. Pontevedra, Spain

Porté AJ, Lamarque LJ, Guengant Y, Burlett R, Bernier F, Bignalet H, Lortie CJ, Delzon S (2012) Control of Acer negundo – insights from genetic and physiological studies. Tree Invasions workshop. Bariloche, Argentina

Lamarque LJ, Lortie CJ, Delzon S (2011). A biogeographical study of the phenotypic plasticity and genetic adaptation of two invasive maple trees. Canadian Society for Ecology and Evolution annual meeting. Banff, AB, Canada

Lamarque LJ, Delzon S, Michalet R (2007). Meta-analysis on tree invasions. 3rd francophone Colloquium of Plant Community Ecology (ECOVEG). Bordeaux, France

 

Conference posters

Lamarque LJ, Lortie CJ, Porté AJ, Delzon S (2011). A biogeographical study of the genetic adaptation and phenotypic plasticity of two invasive maple trees, Acer negundo and Acer platanoides. 11th International Conference on the Ecology and Management of Alien Plant Invasions: bridging the gap between scientific knowledge and management practice. Szombathely, Hungary

Porté AJ, Lamarque LJ, Lortie CJ, Michalet R, Delzon S (2011). Invasive Acer negundo outperforms native species in non-limiting resource environments due to its higher phenotypic plasticity. 11th International Conference on the Ecology and Management of Alien Plant Invasions: bridging the gap between scientific knowledge and management practice. Szombathely, Hungary

Delzon S, Lamarque LJ, Signarbieux C, Michalet R (2007). Growth and invasive potential of Acer negundo in riparian habitats in southwestern France. International workshop Colonisation vs. Invasion: do the same traits matter? Ascona, Switzerland

Lamarque LJ, Delzon S, Signarbieux C, Michalet R (2007). Theories of biological invasions and experimental analyses of physiological traits of an invasive (Acer negundo) and native species of riparian habitats in southern France. 9th Days of Functional Ecology (JEF). Biarritz, France

 

Scientific reports

Lamarque LJ (2013). Ecology and evolution of invasive maple tree species. PhD thesis. York University, Toronto. 286 p

 

Scholarships and other awards

2015 : EnviroNorth post-doctoral fellowship
2009-2013 : York University Research Cost Fund
2008-2013 : York University Fieldwork Cost Fund

 

Affiliations
CSEE (Canadian Society of Ecology and Evolution)

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