SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION OF MOUNTAIN AVENS, DRYAS OCTOPETALA L. IN THE HIGH ARCTIC, NY-ÅLESUND, SVALBARD (19th Symposium on Polar Biology)
I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dry us oclopclala L , occurring near Bragger glacier in Ny-Alesund (78°55'N, 11°56'E), Svalbard in Norway. The flowers showed sun-tracking movement on sunny days, but the move...
Main Authors: | , |
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Format: | Report |
Language: | English |
Published: |
Proceeding
1998
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Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5371 http://id.nii.ac.jp/1291/00005371/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5371&item_no=1&attribute_id=18&file_no=1 |
Summary: | I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dry us oclopclala L , occurring near Bragger glacier in Ny-Alesund (78°55'N, 11°56'E), Svalbard in Norway. The flowers showed sun-tracking movement on sunny days, but the movement was mostly found around noon and was not so active throughout a sunny day. The temperature increment of the gynoecmm in flowers facing the sun was ca 2℃ higher than in flowers with their back to the sun Petal removal resulted in considerable reduction of the gynoecmm temperature Insects (mostly mosquitoes) visiting flowers were very infrequent, suggesting that a severe pollinator limitation restricted the crosspollination. During the experiments, flowers of Dryas octopetala did not produce any developed seeds under natural condition (0% seed-set) Cross-pollinated flowers showed 8% seed-set, while flowers which were artificially warmed by small green-houses during the flowering period showed 60% seed-set, indicating that the reproduction of D octopetala is strongly restricted by low temperature during the flowering period, rather than by pollinator limitation, in the population of Ny-Ålesund, Svalbard These results suggest that the sun-tracking behavior and parabola-shaped flower structure with large petals are important for seed-setting success by increasing the gynoecmm temperature. |
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