Reproductive Patterns of Betula Pendula and B. Pubescens Coll. along a Regional Altitudinal Gradient in Northern Sweden. Holm, S. 17(1):60–72.
Paper doi abstract bibtex The Scandinavian birches have different distribution patterns Betula pendula reaches its upper tree limit at the bottom of the valleys in the Scandes, while B pubescens ssp pubescens extends above the B pendula limit, and merges into B pubescens ssp tortuosa at higher elevations In a 6 yr study I quantified the spatial and temporal variation in the reproduction of these species along a regional altitudinal gradient Betula pendula showed a steeper altitudinal decrease of seed germinability and seed germination rate than B pubescens coll Seed weight was strongly and positively correlated with altitude for B pubescens, but not for B pendula The proportion of seeds infected by gall midges Semudobia coll, was much higher in B pendula than in B pubescens coll especially in the mountain area All birch taxa showed large annual variations in quantity and quality of seeds The sapling density was higher in B pubescens ssp pubescens stands than in B pendula and B pubescens ssp tortuosa stands in the mountains The vegetative reproduction was about three times higher for B pubescens ssp tortuosa, than for the other two birches These results indicate that the altitudinal variation in reproduction among the birch taxa mirror their present distribution patterns
@article{holmReproductivePatternsBetula1994,
title = {Reproductive Patterns of {{Betula}} Pendula and {{B}}. Pubescens Coll. along a Regional Altitudinal Gradient in Northern {{Sweden}}},
author = {Holm, Stig-Olov},
date = {1994-03},
journaltitle = {Ecography},
volume = {17},
pages = {60--72},
issn = {0906-7590},
doi = {10.1111/j.1600-0587.1994.tb00077.x},
url = {https://doi.org/10.1111/j.1600-0587.1994.tb00077.x},
abstract = {The Scandinavian birches have different distribution patterns Betula pendula reaches its upper tree limit at the bottom of the valleys in the Scandes, while B pubescens ssp pubescens extends above the B pendula limit, and merges into B pubescens ssp tortuosa at higher elevations In a 6 yr study I quantified the spatial and temporal variation in the reproduction of these species along a regional altitudinal gradient Betula pendula showed a steeper altitudinal decrease of seed germinability and seed germination rate than B pubescens coll Seed weight was strongly and positively correlated with altitude for B pubescens, but not for B pendula The proportion of seeds infected by gall midges Semudobia coll, was much higher in B pendula than in B pubescens coll especially in the mountain area All birch taxa showed large annual variations in quantity and quality of seeds The sapling density was higher in B pubescens ssp pubescens stands than in B pendula and B pubescens ssp tortuosa stands in the mountains The vegetative reproduction was about three times higher for B pubescens ssp tortuosa, than for the other two birches These results indicate that the altitudinal variation in reproduction among the birch taxa mirror their present distribution patterns},
keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13514365,~to-add-doi-URL,betula-pendula,betula-pubescens,ecology,sweden},
number = {1}
}