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The tree ring and historical ecology lab at the Université du Québec à Rimouski (UQAR) studies the effects of climate change and anthropogenic (settlement, logging) and natural (fire, insect outbreaks) disturbances on ecosystem and landscape dynamics. We work in the north of the temperate and boreal zones, mainly in the North American taiga. Our main approaches are dendrochronology (the study of tree rings to reconstruct climates and ecosystems of the past) and the analysis of historical records, mainly the early land survey records of eastern Canada. Our results help understand and manage forest landscapes and northern territories.

Millennial tree rings:

L18_0910_029The laboratory is developing a network of long tree-ring chronologies across the boreal forest using tree trunks preserved at the bottom of lakes for centuries or millennia. We use characteristics of annual growth rings of trees (ring width, wood density, carbon and oxygen isotopes) in order to reconstruct ancient environments and past climates.

Land survey archives

ANC_C-017695(arpenteurs)Our team compiles and analyzes hundreds of thousands of observations on forest composition made during the eighteenth and nineteenth centuries in the temperate zone of Quebec. The first surveyors madated to divide the territory systematically recorded in their notebooks their observations on forest composition. Today these observations can be located precisely, in order to see how the forest composition varied between regions before the rise of industrial forestry.

Taiga wildfires:

DSC_0235We study forest fires in the taiga of Eastern Canada, a region of high fire activity. Detailed field works allow us to describe how the size and frequency of fires vary over time across the territory. We establish a long-term monitoring network to document the ecological consequences of fires. We study the vulnerability of infrastructures to fire.

Recent Publications:

Wang F. et al. 2019. Pre-1930 unstable relationship between climate and tree-ring width of Pinus taiwanensis Hayata in southeastern China. Dendrochronologia: 57, 125629

Danneyrolles V et al. 2019. Stronger influence of anthropogenic disturbance than climate change on century-scale compositional changes in northern forests. Nature Communications 10: 1265. Danneyrolles NC19; Supplements.

Terrail R et al. 2019. Reorganization of tree communities over the last century in the northern hardwoods of eastern Canada. Applied Vegetation Science.

Boulanger Y et al 2019. Climate change will affect the ability of forest management to reduce gaps between current and presettlement forest composition in southeastern Canada. Landscape Ecology 34: 159-174.

Barber QE et al 2018.  Potential impacts of climate change on the habitat of boreal woodland caribou. Ecosphere 9, e02472

Boivin M et al 2018. Using tree-rings to determine large wood residence time and transport pulses in a gravel-bed river. River flow conference 2018, 40:02008.

Büntgen U et al. 2018. Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE. Nature Communications 9: 3605.

Lemus-Lauzon I et al. 2018. Tree-ring evidence of changes in the subarctic forest cover linked to human disturbance in northern Labrador (Canada). Écoscience 25: 135-151.

Erni S, et al 2018. Stand age influence on potential wildfire ignition and spread in the boreal forest of northeastern Canada. Ecosystems 21: 1471-1486.