SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION
Abstract: I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dryus octopetulu L., occurring near Bregger glacier in ~ ~- A l e s u n d (78'55'N, 1 Ip56'E), Svalbard in Norway. The flowers showed sun-tracking movement on s...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.8099 2023-05-15T15:08:29+02:00 SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION O F Mountain Avens Dr Yas Octopetala L Naoya Wada The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.8099 http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.8099 http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf text ftciteseerx 2016-01-08T13:43:51Z Abstract: I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dryus octopetulu L., occurring near Bregger glacier in ~ ~- A l e s u n d (78'55'N, 1 Ip56'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 gynoecium in flowers facing the sun was ca. 2 C higher than in flowers with their back to the sun. Petal removal resulted in considerable reduction of the gynoecium temperature. Insects (mostly mosquitoes) visiting flowers were very infrequent, suggesting that a severe pollinator limitation restricted the cross-pollination. During the experiments, flowers of Dryas octopetalu 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 re-production of D. octopetulu is strongly restricted by low temperature during the flowering period, rather than by pollinator limitation, in the population of Ny-Alesund, 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 gynoecium temperature. key words: artificial warming, cross pollination, flower heliotropism, High Arctic, seed production Text Arctic glacier glacier Mountain avens Svalbard Unknown Arctic Norway Svalbard |
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description |
Abstract: I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dryus octopetulu L., occurring near Bregger glacier in ~ ~- A l e s u n d (78'55'N, 1 Ip56'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 gynoecium in flowers facing the sun was ca. 2 C higher than in flowers with their back to the sun. Petal removal resulted in considerable reduction of the gynoecium temperature. Insects (mostly mosquitoes) visiting flowers were very infrequent, suggesting that a severe pollinator limitation restricted the cross-pollination. During the experiments, flowers of Dryas octopetalu 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 re-production of D. octopetulu is strongly restricted by low temperature during the flowering period, rather than by pollinator limitation, in the population of Ny-Alesund, 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 gynoecium temperature. key words: artificial warming, cross pollination, flower heliotropism, High Arctic, seed production |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
O F Mountain Avens Dr Yas Octopetala L Naoya Wada |
spellingShingle |
O F Mountain Avens Dr Yas Octopetala L Naoya Wada SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
author_facet |
O F Mountain Avens Dr Yas Octopetala L Naoya Wada |
author_sort |
O F Mountain Avens |
title |
SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
title_short |
SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
title_full |
SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
title_fullStr |
SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
title_full_unstemmed |
SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION |
title_sort |
sun-tracking flower movement and seed production |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.8099 http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf |
geographic |
Arctic Norway Svalbard |
geographic_facet |
Arctic Norway Svalbard |
genre |
Arctic glacier glacier Mountain avens Svalbard |
genre_facet |
Arctic glacier glacier Mountain avens Svalbard |
op_source |
http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.8099 http://www3.u-toyama.ac.jp/cfes/wada/pdf_papers/Wada1998PB.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766339847469924352 |