2003
DOI: 10.2747/0272-3646.24.6.520
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Feedback-Driven Response to Multidecadal Climatic Variability at an Alpine Treeline

Abstract: The Pacific Decadal Oscillation (PDO) has significant climatological and ecological effects in northwestern North America. Its possible effects and their modification by feedbacks are examined in the forest-tundra ecotone in Glacier National Park, Montana, USA. Tree ring samples were collected to estimate establishment dates in 10 quadrats. Age-diameter regressions were used to estimate the ages of uncored trees. The temporal pattern of establishment and survival was compared to the pattern of the PDO. A wave … Show more

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Cited by 46 publications
(34 citation statements)
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References 80 publications
(94 reference statements)
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“…Dwarf conifer shrubs include Juniperus communis and Juniperus horizontalis . Wind is an important climate variable affecting the local pattern of these treeline species (Grace 1977, 1989; Alftine and Malanson 2004) through the creation of tree islands and distribution of snow (Alftine, Malanson, and Fagre 2003). Many trees at the study sites are separate individuals, established from seed rather than through layering (Bekker 2005).…”
Section: Study Site and Methodsmentioning
confidence: 99%
“…Dwarf conifer shrubs include Juniperus communis and Juniperus horizontalis . Wind is an important climate variable affecting the local pattern of these treeline species (Grace 1977, 1989; Alftine and Malanson 2004) through the creation of tree islands and distribution of snow (Alftine, Malanson, and Fagre 2003). Many trees at the study sites are separate individuals, established from seed rather than through layering (Bekker 2005).…”
Section: Study Site and Methodsmentioning
confidence: 99%
“…Alpine treeline in Glacier National Park (GNP) advanced into tundra in the 19th century (Bekker 2005). We analyzed a 1999 airborne multispectral remote sensing image with 1 m spatial resolution for Lee Ridge, GNP, at the leading edge of a recent (1950–1980) treeline advance (Alftine, Malanson, and Fagre 2003). It was classified as tree or tundra (Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Treeline advances in the latter half of the 20 th century coincided with the cool (wet) phase of the Pacific Decadal Oscillation, and advance stopped during the warm (dry) phase of the 1980s and 1990s (Alftine et al 2003).…”
Section: For Example In the 19mentioning
confidence: 99%