Data from: Varying selection differential throughout the climatic range of Norway spruce in Central Europe
Predicting species distribution changes in global warming requires an understanding of how climatic constraints shape the genetic variation of adaptive traits and force local adaptations. To understand the genetic capacity of Norway spruce populations in Central Europe, we analyzed variation of tree...
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Zusammenfassung: | Predicting species distribution changes in global warming requires an
understanding of how climatic constraints shape the genetic variation of
adaptive traits and force local adaptations. To understand the genetic
capacity of Norway spruce populations in Central Europe, we analyzed
variation of tree heights at the juvenile stage in common-garden
experiments established from the species’ warm-dry to cold-moist
distribution limits. We report the following findings: first, 47 % of the
total tree-height variation at trial sites is attributable to the tree
populations irrespective of site climate. Second, tree height variation
within populations is higher at cold-moist trial sites than at warm-dry
sites and higher within populations originating from cold-moist habitats
than from warm-dry habitats. Third, for tree ages of 7 to 15 years, the
variation within populations increases at cold-moist trial sites, whereas
it remains constant at warm-dry sites. Fourth, tree-height distributions
are right-skewed at cold-moist trial sites, whereas they are non-skewed
but platykurtic at warm-dry sites. Our results suggest that in cold
environments climatic conditions impose stronger selection and probably
restrict the distribution of spruce, whereas at the warm distribution
limit, the species’ realized niche might rather be controlled by external
drivers, for example forest insects. |
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DOI: | 10.5061/dryad.877ts |