Pollen vectors and inflorescence morphology in four species of Salix |
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Authors: | S Karrenberg J Kollmann P J Edwards |
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Institution: | (1) Geobotanical Institute, ETH, Zürich, Switzerland, CH;(2) Department of Ecology, Royal Veterinary and Agricultural University, Frederiksberg, Denmark, DK |
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Abstract: | Many plant species exhibit inflorescence morphologies intermediate between pollination syndromes and may therefore employ
generalist pollination strategies. We studied how wind and insect pollination are related to inflorescence morphology in the
floodplain species Salix alba, S. elaeagnos, S. daphnoides and S. triandra. Insect exclusion experiments showed that all four species were primarily pollinated by insects, but were capable of some
seed set when wind was the only pollen vector. Such a generalist pollination system may provide reproductive assurance in
these pioneer species. High wind pollination success was associated with slender and divided stigmatic lobes and low ovule
number per catkin, which may enhance filtering capacity for airborne pollen. In contrast, species that relied more on insect
pollination had robust stigmata and many ovules per catkin, which may reduce the number of insect visits necessary for pollination.
Received April 18, 2002; accepted July 23, 2002 Published online: November 28, 2002
Addresses of authors: S. Karrenberg (e-mail: karrenberg@bio.indiana.edu), Department of Biology, Indiana University, Jordan
Hall, 1001 East Third Street, Bloomington, IN 47405, USA. P. J. Edwards, Geobotanical Institute, ETH, Zürichbergstrasse 38,
CH-8044 Zürich, Switzerland. J. Kollmann, Department of Ecology, Royal Veterinary and Agricultural University, Rolighedsvej
21, DK-1958 Frederiksberg, Denmark. |
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Keywords: | Key words: Ambophily generalist pollination sys-tem insect pollination Salix seed set wind pollination willows |
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