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Range expansion of thermophilic aspen (Populus tremula L.) in the Swedish subarctic

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Abstract
In subarctic Sweden, recent decadal colonization and expansion of aspen (Populus tremula L.) were recorded. Over the past 100 years, aspen became c. 16 times more abundant, mainly as a result of increased sexual regeneration. Moreover, aspen now reach tree-size (>2 m) at the alpine treeline, an ecotone that has been dominated by mountain birch (Betula pubescens ssp. czerepanovii) for at least the past 4000 years. We found that sexual regeneration in aspen probably occurred seven times or more within the last century. Whereas sexual regeneration occurred during moist years following a year with an exceptionally high June July temperature, asexual regeneration was favored by warm and dry summers. Disturbance to the birch forest by cyclic moth population outbreaks was critical in aspen establishment in the subalpine area. At the treeline, aspen colonization was less determined by these moth outbreaks, and was mainly restricted by summer temperature. If summer warming persists, aspen spread may continue in subarctic Sweden, particularly at the treeline. However, changing disturbance regimes, future herbivore population dynamics and the responses of aspen's competitors birch and pine to a changing climate may result in different outcomes.
Keywords
EUROPEAN ASPEN, NORTHERN SWEDEN, BOREAL-FOREST, RECENT CLIMATE-CHANGE, TREE-LINE AREA, BIRCH FOREST, ENVIRONMENTAL-CHANGE, OPEROPHTERA-BRUMATA, EPIRRITA-AUTUMNATA, SCANDES MOUNTAINS

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Citation

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Chicago
Van Bogaert, Rik, Christer Jonasson, Morgan De Dapper, and Terry V Callaghan. 2010. “Range Expansion of Thermophilic Aspen (Populus Tremula L.) in the Swedish Subarctic.” Arctic Antarctic and Alpine Research 42 (3): 362–375.
APA
Van Bogaert, R., Jonasson, C., De Dapper, M., & Callaghan, T. V. (2010). Range expansion of thermophilic aspen (Populus tremula L.) in the Swedish subarctic. ARCTIC ANTARCTIC AND ALPINE RESEARCH, 42(3), 362–375.
Vancouver
1.
Van Bogaert R, Jonasson C, De Dapper M, Callaghan TV. Range expansion of thermophilic aspen (Populus tremula L.) in the Swedish subarctic. ARCTIC ANTARCTIC AND ALPINE RESEARCH. 2010;42(3):362–75.
MLA
Van Bogaert, Rik, Christer Jonasson, Morgan De Dapper, et al. “Range Expansion of Thermophilic Aspen (Populus Tremula L.) in the Swedish Subarctic.” ARCTIC ANTARCTIC AND ALPINE RESEARCH 42.3 (2010): 362–375. Print.
@article{1056951,
  abstract     = {In subarctic Sweden, recent decadal colonization and expansion of aspen (Populus tremula L.) were recorded. Over the past 100 years, aspen became c. 16 times more abundant, mainly as a result of increased sexual regeneration. Moreover, aspen now reach tree-size ({\textrangle}2 m) at the alpine treeline, an ecotone that has been dominated by mountain birch (Betula pubescens ssp. czerepanovii) for at least the past 4000 years. We found that sexual regeneration in aspen probably occurred seven times or more within the last century. Whereas sexual regeneration occurred during moist years following a year with an exceptionally high June July temperature, asexual regeneration was favored by warm and dry summers. Disturbance to the birch forest by cyclic moth population outbreaks was critical in aspen establishment in the subalpine area. At the treeline, aspen colonization was less determined by these moth outbreaks, and was mainly restricted by summer temperature. If summer warming persists, aspen spread may continue in subarctic Sweden, particularly at the treeline. However, changing disturbance regimes, future herbivore population dynamics and the responses of aspen's competitors birch and pine to a changing climate may result in different outcomes.},
  author       = {Van Bogaert, Rik and Jonasson, Christer and De Dapper, Morgan and Callaghan, Terry V},
  issn         = {1523-0430},
  journal      = {ARCTIC ANTARCTIC AND ALPINE RESEARCH},
  keyword      = {EUROPEAN ASPEN,NORTHERN SWEDEN,BOREAL-FOREST,RECENT CLIMATE-CHANGE,TREE-LINE AREA,BIRCH FOREST,ENVIRONMENTAL-CHANGE,OPEROPHTERA-BRUMATA,EPIRRITA-AUTUMNATA,SCANDES MOUNTAINS},
  language     = {eng},
  number       = {3},
  pages        = {362--375},
  title        = {Range expansion of thermophilic aspen (Populus tremula L.) in the Swedish subarctic},
  url          = {http://dx.doi.org/10.1657/1938-4246-42.3.362},
  volume       = {42},
  year         = {2010},
}

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