Pollen limitation of reproductive success in two sympatric alpine willows (Salicaceae) with contrasting pollination strategies

American Journal of Botany - Tập 88 Số 6 - Trang 1011-1015 - 2001
Ørjan Totland1, Matteo Sottocornola2
12Department of Biology and Nature Conservation, The Agricultural University of Norway, P.O. Box 5014, N-1432 Ås, Norway
23via Gallicciolli 2, 24121 Bergamo, Italy

Tóm tắt

We compared the extent of pollen limitation on female reproductive success of Salix lanata L., an entirely insect‐pollinated willow, and S. lapponum L., which is 50 : 50% insect : wind pollinated (ambophilous). Supplemental hand‐pollination significantly increased seed number per fruit by nearly 50% in the insect‐pollinated willow, but had no significant impact on seed number in the dually pollinated species. Fruit set was not affected by the treatment in either of the species. These results demonstrate that pollen limitation on reproductive success is most pronounced in the species that depends entirely on insects for pollination. In general, pollinator visitation was highest to S. lapponum, but bumble bees were only observed on S. lanata, suggesting that the quantity and quality of pollinator visitation differed between the species. Our results empirically support the hypothesis that a dual pollination strategy is most effective in alpine environments with low and infrequent pollinator activity and high wind speeds.

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Thông tin xuất bản

American Journal of Botany

Tập 88 Số 6

1011-1015

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