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Variation in phenology and height increment of northern Ulmus glabra populations: Implications for conservation

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Variation in budburst, height increment and growth cessation within and among five Norwegian Ulmus glabra (Huds.) populations was recorded in an experimental trial during the fourth and fifth growing seasons. Budburst occurred first in inland populations and last in coastal populations, and latitude of origin was less important for timing of budburst than distance from the coast. Height increment and date of growth cessation were correlated to latitude, height increment decreased with increasing latitude of origin, whereas growth cessation occurred first in northern populations and later with increasing southern origin. Thus, the phenological traits vary in accordance with the climate from where the populations have been derived. There was a general large within-population variation in phenological traits. The results are discussed in relation to conservation of adaptive trait variation of the species.
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Keywords: Adaptive traits; Dutch elm disease; conservation

Document Type: Research Article

Affiliations: 1: Norwegian Forest and Landscape Institute, Fana, Norway 2: Norwegian Genetic Resource Centre, Norwegian Forest and Landscape Institute, Ås, Norway

Publication date: 2007-01-01

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