Hypsithermal range extension of white pine (<i>Pinus strobus</i> L.) in Quebec, Canada

Terasmäe, J.; Anderson, T. W.

doi:10.1139/e70-035

Cited by 55 publications

(34 citation statements)

References 3 publications

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“…Le dernier événement géologique responsable du type de paysage est le lac proglaciaire Ojibway dont les dépôts argileux, silteux ou sableux sont omniprésents. Ils recouvrent divers dépôts glaciaires (tills et dépôts associés), mais laissent souvent affleurer d'importantes accumulations fluvioglaciaires, tels les eskers, orientés du nord au sud (TREMBLAY, 1974 (IGNATIUS, 1956), circles (POTZGER and COURTEMANCHE, 1956) a white square (TERASMAE and ANDERSON, 1970) and a black triangle (VINCENT, 1973). Only works related to proglacial Lake Barlow-Ojibway are identified.…”

Section: Contexte éCologique Régionalunclassified

“…The road network, shown in broken lines, gives an idea of land occupation. The black square shows the site studied by TERASMAE and ANDERSON (1970). Topography around sites Yelle and Clo appears in inset maps (elevation in meters).…”

Section: Contexte éCologique Régionalmentioning

confidence: 99%

“…Les deux diagrammes en témoignent, mais c'est au site Yelle que ce pin est le mieux représenté polliniquement. Aussi pouvons-nous conclure que les régions de collines ont été les zones de prédilection du pin blanc, avec sans doute les stations xériques telles les eskers, comme l'ont montré TERASMAE et ANDERSON (1970). En effet, au lac Bissonnette, les pins blancs ont crû sur les pentes de l'esker avant de tomber dans la tourbière en bordure du lac et y être fossilisés, vers 5 000 ans avant nos jours.…”

Section: Histoire De La Végétation Régionaleunclassified

“…Il y note en effet un délai maximal allant de 1 000 ans (bois) à 1 500 (tourbes). Il semble qu'un tel délai se soit produit au lac Bissonnette (Val-Saint-Gilles; TERASMAE et ANDERSON, 1970), l'âge maximal enregistré étant d'environ 6 500 ans BP.…”

Section: Oounclassified

“…Un seul diagramme pollinique a été dressé par TERASMAE et ANDERSON (1970), sur des sédiments tourbeux accumulés en bordure du lac Bissonnette (49°01' lat. N., 79°05' long.…”

Section: Introductionunclassified

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Histoire postglaciaire de la végétation au sud du lac Abitibi, Ontario et Québec

Richard

2011

gpq

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Les lacs Yelle et Clo, situés à environ 10 km au sud du lac Abitibi, ont respectivement livré des séquences continues de sédiments depuis la déglaciation de la région, vers 9 000 BP, et le retrait du lac proglaciaire Ojibway, vers 7 900 BP jusqu’à l’actuel. L’interprétation des diagrammes polliniques révèle que la rive sud du lac Ojibway était occupée, vers 8 900 BP, par une forêt ouverte dominée par l’épinette noire (Picea mariana), dans laquelle le tremble (Populus tremuloides) et le pin gris (Pinus divaricata) jouaient un rôle important. Ce type de paysage s’est maintenu durant environ 1 000 ans dans les collines alors insulaires entourant le lac Yelle, pendant que le niveau du lac Ojibway passait de 355 à 280 m. Lors de la vidange du lac Ojibway, la colonisation végétale des basses terres s’est effectuée rapidement. De 7 900 à 7 200 ans BP, la forêt appartenait déjà au domaine de la sapinière à bouleau blanc, occupant les stations mésiques, mais l’épinette noire et le tremble étaient abondants, de même que le pin gris. De 7 200 à 6 000 BP, la végétation a atteint un maximum de diversité et de thermophilie. Le pin blanc (Pinus strobus) s’est installé, surtout dans les collines et sur les stations xériques. Entre 6 000 et 3 250 BP, le genévrier (Juniperus) est devenu beaucoup plus abondant. Depuis 3 250 ans BP, la forêt s’est refermée, et l’épinette noire et le pin gris ont progressé, aux dépens du pin blanc notamment. La sapinière à bouleau blanc, sur stations moyennes, s’est toujours maintenue au sein du paysage et, malgré des différences, révolution de la végétation a été synchrone entre les deux sites depuis 7 900 ans BP.Complete sequences of sediments representing the time since ice retreat (ca. 9,000 BP) and drainage of proglacial Lake Ojibway (ca. 7,900 BP) have been recovered from Lake Yelle and Lake Clo, two lakes, in a region about 10 km south of lake Abitibi. The interpretation of the pollen diagrams lead to the reconstruction of an open forest dominated by black spruce (Picea mariana), with abundant aspen (Populus tremuloides) and jack pine (Pinus divaricata), at the southern shore of lake Ojibway around 8,900 BP. This type of vegetation lasted about 1 000 years on the islands formed at that time by the hills around Lake Yelle, while the level of Lake Ojibway's level fell from 355 to 280 m. The forest vegetation migrated rapidly into the lowlands after the drainage of the proglacial lake. From 7,900 to 7,200 years BP, the forest was a balsam fir — white birch community, on the mesic sites, but black spruce and jack pine were abundant. From 7,200 to 6,000 BP, the vegetation was at its maximum diversity and thermophily. White pine (Pinus strobus) migrated into the area, especially on hills and on xeric sites. Between 6,000 and 3,250 BP, juniper (Juniperus) became more abundant, the forest canopy being still open. Since 3,250 BP, the forest cover has closed and black spruce and jack pine have increased at the expense of white pine, in particular. The balsam fir-white birch community, on the mesic sites...

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Section: Contexte éCologique Régionalunclassified

Section: Contexte éCologique Régionalmentioning

confidence: 99%

Section: Histoire De La Végétation Régionaleunclassified

Section: Oounclassified

“…Un seul diagramme pollinique a été dressé par TERASMAE et ANDERSON (1970), sur des sédiments tourbeux accumulés en bordure du lac Bissonnette (49°01' lat. N., 79°05' long.…”

Section: Introductionunclassified

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Histoire postglaciaire de la végétation au sud du lac Abitibi, Ontario et Québec

Richard

2011

gpq

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Historical dynamics of marginal populations at the leading edge of a temperate species in the boreal‐temperate ecotone

Mondou Laperrière,

Minchev,

Grondin

et al. 2024

Ecosphere

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Marginal populations of temperate species at the leading edge of their range will likely play a key role at the boreal‐temperate ecotone (BTE) in the face of climate changes. In eastern North America, red maple (Acer rubrum L.) is the most abundant temperate tree species encroaching into the boreal forest. In order to provide useful insights about possible responses to climate change and anticipate the formation of new assemblages, this study relies on long‐term Holocene data from forest soil wood macrofossils (charcoal and ligneous remains) and contemporary stand analyses to assess the postglacial origin and modern‐day dynamics of red maple at its leading edge within the BTE. We sampled the soils of eight marginal red maple stands. Macroscopic charcoal particles and ligneous remains were identified using microanatomical characteristics. Macrofossils of temperate tree species were radiocarbon dated to reconstruct their long‐term stand‐scale history. Contemporary dynamics (<200 years) were assessed by analyzing tree size structure of all stems within 400 m2 plots, minimal stand age from tree‐ring dating, as well as the recent occurrence of fire and logging from published ecoforest data. White pine (Pinus strobus L.), the only other temperate tree species that was identified, was present 6500–4000 years ago, during the mid‐Holocene thermal maximum but decreased during the cooler and fire‐prone late‐Holocene Neoglacial (4000 years ago to present). By contrast, red maple was found at its current northern limit since the last 4000 years. Modern‐day marginal red maple stands are self‐regenerating populations that established following a recent stand‐replacing disturbance (wildfire or clearcut). The present‐day increase of anthropogenic disturbances within the BTE could mirror the Neoglacial increase in fire activity that fostered red maple during the Holocene. We thus predict that red maple is poised to increase in abundance within the BTE, which should facilitate the northward establishment of other temperate deciduous species into the boreal forest prompted by the new conditions brought about by anthropogenic or climate change‐induced disturbances.

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Multi‐proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)

Vogel,

Joannin,

Lamara

et al. 2024

J Quaternary Science

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Following deglaciation, lowland sites in eastern Canada that were covered by proglacial Lake Ojibway recorded direct afforestation with boreal mixedwood taxa, without an initial tundra phase, contrary to sites that were never covered by this lake. Because former islands of proglacial Lake Ojibway were colonized by vegetation before lake drainage around 8200 cal a bp, we hypothesized that these paleo‐islands went through a non‐arboreal phase which eventually transitioned to boreal mixedwoods, hence providing a source of propagules for rapid and later colonization of the lowlands. We carried out a multi‐proxy analysis combining pollen, macro‐remains, sedimentary ancient DNA and charcoal to document vegetation composition and dynamics on two paleo‐islands. Both study sites recorded progressive vegetation establishment starting with a tundra‐like phase with only herbs and shrubs, followed by open forests dominated by either larch or pine, culminating with the establishment of the boreal mixedwoods about 300 years before the final drainage of proglacial Lake Ojibway. Fire regimes seem to have partially driven vegetation dynamics and diversity on the paleo‐islands. Paleo‐islands were sources of propagules, which helps explain how the former Lake Ojibway lowlands were directly colonized by boreal mixedwoods, without an initial tundra phase.

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Hypsithermal range extension of white pine (Pinus strobus L.) in Quebec, Canada

Cited by 55 publications

References 3 publications

Histoire postglaciaire de la végétation au sud du lac Abitibi, Ontario et Québec

Histoire postglaciaire de la végétation au sud du lac Abitibi, Ontario et Québec

Historical dynamics of marginal populations at the leading edge of a temperate species in the boreal‐temperate ecotone

Multi‐proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)

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