Marilou Beaudet

Associate member

Biologist (Ph.D.)
Canadian Forest Service (Laurentian Forestry Center)

Profil LinkedIn 

  • Post-doctorat CRSNG-Industriel, 2003, Domtar/UQAM
  • Ph.D. in Environmental sciences, 2001, UQAM
  • M.Sc. in Biology, 1994, UQAM
  • B.Sc. in Biology, 1991, McGill


My work aims to improve our understanding of the impact of natural disturbances (e.g. ice storm) and partial cutting on micro-environmental conditions, regeneration and response of residual trees, mainly in northern hardwood forest. I use two complementary approaches by conducting field studies and by using modeling.

One of my research interests concerns the relationship between the structure of forest cover and spatio-temporal variability of light conditions in the understory. Here again, I am interested by the impact of natural disturbances (e.g. ice storm: Beaudet et al., 2007), and harvesting (e.g. selection cutting: Beaudet and Messier, 2002; Beaudet et al., 2004) on the opening of the canopy and understory light. I also used simulations with SORTIE-ND  to assess the effect of various types of partial cuts on light environment in northern hardwood forests (Beaudet et al., 2002), and boreal mixedwood forests (Beaudet et al., 2011).

Another aspect of my research aims at improving our understanding of how forest regeneration responds to the opening of the canopy. Among other things, I have been studying the growth, morphology and photosynthetic response of sugar maple, yellow birch and American beech (Beaudet and Messier, 1998; Beaudet et al., 1999; Beaudet et al., 2000; Beaudet et al., 2007). In the case of beech, our work showed that beech regeneration of seed and root sucker origin has markedly different growth and survival rates (Beaudet and Messier, 2008). Sugar maple and beech regeneration dynamics was studied with Jacques Brisson in the Boise-des-Muir Ecological Reserve  (Beaudet et al., 1999, 2007) and as part of the PhD thesis of Dominique Gravel (Gravel et al., 2008).

Besides regeneration, partial cuttings also affect growth and death probability of residual trees. In the case of sugar maple, these questions were studied by Henrik Hartmann (Hartmann et al., 2007, 2008, 2009). In the most recent article (Hartmann et al., 2009), we developed a growth model for sugar maple following selection cutting. Our results showed a decrease in growth with increasing proximity to a skid trail. Furthermore, structural characteristics of northern hardwood forests were compared among old-growth stands and stands harvested using selection cutting and diameter-limit cutting (Angers et al., 2005).

Finally, I also have an interest in using a spatially explicit model (SORTIE-ND; see Coates et al., 2003) to compare the effects of different silvicultural approaches on the evolution of northern hardwood stands in southern Quebec (FQRNT projects with the collaboration of David F Greene and Christian Messier in 2002-2005 and with C. Messier, Dominique Gravel, Guy Lessard (CERFO) and Daniel Mailly in 2010-2013).



Ph.D. thesis


Book chapter
  1. Messier, C., Posada, J., Aubin, I., Beaudet, M. (2009) Functional Relationships Between Old-Growth Forest Canopies, Understorey Light and Vegetation Dynamics. (Chap. 6) In Old-Growth Forest: Function, Fate and Value. (Wirth, C. and Gleixner, G .and Heimann, M., Eds.) Berlin, Allemagne, Springer, pages 115-140
Articles published in journals with revision committee
  1. Girard, F., Beaudet, M., Mailly, D., Messier, C. (2014) Integrating climatic response in competition dependent tree-level growth models for northern hardwoods. Forest Ecology and Management, 323:138-147
  2. Bose, A.K., Harvey, B.D., Brais, S., Beaudet, M., Leduc, A. (2014) Constraints to partial cutting in the boreal forest of Canada in the context of natural disturbance-based management: A review. Forestry, 87(1):11-28
  3. Beaudet, M., Angers, V.-A., Messier, C. (2014) Seedbed proportions in and outside skid trails: Temporal variation following selection cutting in northern hardwood forests. Forest Ecology and Management, 318:151 - 157
  4. Beaudet, M., Harvey, B.D., Messier, C., Coates, D.K., Poulin, J., Kneeshaw, D.D., Brais, S., Bergeron, Y. (2011) Managing understory light conditions in boreal mixedwoods through variation in the intensity and spatial pattern of harvest: A modelling approach. Forest Ecology and Management, 261(1):84-94
  5. Gravel, D., Beaudet, M., Messier, C. (2011) Sapling age structure and growth series reveal a shift in recruitment dynamics of sugar maple and American beech over the last 40 years. Canadian Journal of Forest Research, 41(4):873-880
  6. Gravel, D., Canham, C. D., Beaudet, M., Messier, C. (2010) Shade tolerance, canopy gaps and mechanisms of coexistence of forest trees. Oikos, 119(3):475-484
  7. Gravel, D., Beaudet, M., Messier, C. (2010) Large-scale synchrony of gap dynamics and the distribution of understory tree species in maple-beech forests. Oecologia, 162(1):153-161
  8. Gasser, D., Messier, C., Beaudet, M., Lechowicz, M.J. (2010) Sugar maple and yellow birch regeneration in response to canopy opening, liming and vegetation control in a temperate deciduous forest of Quebec. Forest Ecology and Management, 259(10):2006-2014
  9. Hartmann, H., Beaudet, M., Mazerolle, M.J., Messier, C. (2009) Sugar maple (Acer saccharum Marsh.) growth is influenced by close conspecifics and skid trail proximity following selection harvest. Forest Ecology and Management, 258(5):823 - 831
  10. Lefrancois, M.-L., Beaudet, M., Messier, C. (2008) Crown openness as influenced by tree and site characteristics for yellow birch, sugar maple, and eastern hemlock. Canadian Journal of Forest Research, 38(3):488-497
  11. Beaudet, M., Messier, C. (2008) Beech regeneration of seed and root sucker origin: A comparison of morphology, growth, survival, and response to defoliation. Forest Ecology and Management, 255(10):3659-3666
  12. Gravel, D., Beaudet, M., Messier, C. (2008) Partitioning the Factors of Spatial Variation in Regeneration Density of Shade-Tolerant Tree Species. Ecology, 89(10):2879-2888
  13. Hartmann, H., Beaudet, M., Messier, C. (2008) Using longitudinal survival probabilities to test field vigour estimates in sugar maple (Acer saccharum Marsh.). Forest Ecology and Management, 256(10):1771-1779
  14. Hartmann, H., Messier, C., Beaudet, M. (2007) Improving tree mortality models by accounting for environmental influences. Canadian Journal of Forest Research, 37(11):2106-2114
  15. Beaudet, M., Brisson, J., Messier, C., Gravel, D. (2007) Effect of a major ice storm on understory light conditions in an old-growth Acer-Fagus forest: Pattern of recovery over seven years. Forest Ecology and Management, 242(2-3):553-557
  16. Beaudet, M., Brisson, J., Gravel, D., Messier, C. (2007) Effect of a major canopy disturbance on the coexistence of Acer saccharum and Fagus grandifolia in the understorey of an old-growth forest. Journal of Ecology, 95:458-467
  17. Gravel, D., Canham, C.D., Beaudet, M., Messier, C. (2006) Reconciling niche and neutrality: The continuum hypothesis. Ecology Letters, 9(4):399-409
  18. Angers, V.-A., Messier, C., Beaudet, M., Leduc, A. (2005) Comparing composition and structure in old-growth and harvested (selection and diameter-limit cuts) northern hardwood stands in Quebec. Forest Ecology and Management, 217(2-3):275-293
  19. Beaudet, M., Messier, C., Leduc, A. (2004) Understorey light profiles in temperate deciduous forests: Recovery process following selection cutting. Journal of Ecology, 92(2):328-338
  20. Ricard, J.P., Messier, C., Delagrange, S., Beaudet, M. (2003) Do understory sapling respond to both light and below-ground competition?: A field experiment in a north-eastern American hardwood forest and a literature review. Annals of Forest Science, 60(8):749-756
  21. Coates, D.K., Canham, C.D., Beaudet, M., Sachs, D.L., Messier, C. (2003) Use of a spatially explicit individual-tree model (SORTIE/BC) to explore the implications of patchiness in structurally complex forests. Forest Ecology and Management, 186(1-3):297-310
  22. Beaudet, M., Messier, C., Canham, C.D. (2002) Predictions of understorey light conditions in northern hardwood forests following parameterization, sensitivity analysis, and tests of the SORTIE light model. Forest Ecology and Management, 165(1-3):235-248
  23. Beaudet, M., Messier, C. (2002) Variation in canopy openness and light transmission following selection cutting in northern hardwood stands: An assessment based on hemispherical photographs. Agricultural and Forest Meteorology, 110(3):217-228
  24. Beaudet, M., Messier, C., Hilbert, D.W., Lo, E., Wang, Z.M., Lechowicz, M.J. (2000) Leaf- and plant-level carbon gain in yellow birch, sugar maple, and beech seedlings from contrasting forest light environments. Canadian Journal of Forest Research, 30(3):390-404
  25. Aubin, I., Beaudet, M., Messier, C. (2000) Light extinction coefficients specific to the understory vegetation of the southern boreal forest, Quebec. Canadian Journal of Forest Research, 30(1):168-177
  26. Beaudet, M., Messier, C., Pare, D., Brisson, J., Bergeron, Y. (1999) Possible mechanisms of sugar maple regeneration failure and replacement by beech in the Boise-des-Muir old-growth forest, Quebec. Ecoscience, 6(2):264-271
  27. Beaudet, M., Messier, C. (1998) Growth and morphological responses of yellow birch, sugar maple, and beech seedlings growing under a natural light gradient. Canadian Journal of Forest Research, 28(7):1007-1015
Articles published in journals without revision committee
  1. Angers, V.-A., Messier, C., Beaudet, M., Leduc, A. (2005) Pour un jardinage s’inspirant davantage des perturbations naturelles. L'Aubelle, numéro 148:15-18
  2. Messier, C., Beaudet, M. (2000) L’aménagement durable des érablières sucrières. L'Aubelle, numéro 132 et 133
Scientific reports
  • Beaudet, M. 2004. Modélisation des effets du jardinage de différentes intensités sur les érablières en Estrie. Rapport final de projet CRSNG-industriel présenté à Domtar, 108 pp.
  • Morin, A, Beaudet, M, Delagrange, S, Swift, L, Greene, D, Messier, C, Kneeshaw, DK. 2003. Principales causes de mortalité et principes de modélisation de la régénération chez les semis de bouleau jaune. Revue de littérature présentée à Commonwealth Plywood, 29 pp.
  • Morin, A, Beaudet, M, Messier, C, Kneeshaw, DK, Ruel, J-C. 2003. Morphologie, croissance et survie des semis de bouleau jaune en parquets, quatre ans après coupe, dans le secteur du Lac Darey, Latuque, Aire commune 043-04. Rapport présenté à Commonwealth Plywood, 47 pp.
  • Doyon, F, Gravel, D, Nolet, P, Boullion, D, Majeau, L, Messier, C, Beaudet, M. 2003. L’envahissement par le hêtre dans les érablières de l’Outaouais : phénomène fantôme ou glissement de balancier? Rapport de l’Institut québécois d’aménagement de la forêt feuillue, 16 pp.
  • Messier, C, Beaudet, M, Delagrange, S, Morin, A, Poulin, J. 2002. Revue de littérature et recommandations à propos des pratiques sylvicoles associées au bouleau jaune. Avis scientifique au comité pour la révision du Manuel d'aménagement forestier, MRNQ, 16 pp.
  • Brisson, J, Lareau, C, Beaudet, M, Millet, J, Messier, C, Bouchard, A. 2001. Rétablissement de l'érablière suite au verglas - Le cas d'une forêt ancienne du sud-ouest du Québec. Rapport de l’Institut de recherche en biologie végétale présenté au MRNQ, 108 pp.
  • Coates, KD, Messier, C, Beaudet, M, Sachs, DL, Canham, CD. 2001. SORTIE: a resource-mediated, spatially-explicit individual-tree model that simulates stand dynamics in natural and managed forests. Paper 2001-10. Sustainable Forest Management Network, 29 pp.
  • Nolet, P, Doyon, F, Beaudet, M. 2001. Effets de l’éclaircie commerciale sur les peuplements de chêne rouge et pin blanc. Rapport de l’Institut québécois d’aménagement de la forêt feuillue, 27 pp.
  • Nolet, P, Doyon, F, Beaudet, M. 2000. Effets du jardinage avec trouées et du scarifiage sur la régénération des essences commerciales dans les peuplements de feuillus tolérants avec pin blanc. Rapport de l’Institut québécois d’aménagement de la forêt feuillue, 34 pp.
  • Beaudet, M., Messier, C. 1997. Le bouleau jaune en peuplements feuillus et mixtes : autécologie, dynamique forestière et pratiques sylvicoles. Rapport remis au Groupe d'action de la forêt mixte, Conseil de la recherche forestière du Québec, et à la Forêt Modèle du Bas-Saint-Laurent, 58 pp.
Dissertations and theses
  1. Beaudet, M. (2001) Caractérisation et modélisation des effets du couvert forestier sur la dynamique de la lumière et de la régénération dans l'érablière. PhD thesis, Université du Québec à Montréal
  2. Beaudet, M. (1994) Effet de l'ouverture du couvert forestier sur la croissance, la morphologie et la réponse photosynthétique de semis de bouleau jaune, d'érable à sucre et de hêtre à grandes feuilles. Master's thesis, Université du Québec à Montréal

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