LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Naoya, Wada (1999)
Publisher: Co-Action Publishing
Journal: Polar Research
Languages: English
Types: Article
Subjects:
To determine the factors restricting plant reproduction in front of a glacier, the gender expression and seed production of Dryas octopetala L. (Rosaceae) were observed, as well as the grazing pattern of reindeer on flowers, near Brøggerbreen (Brøgger Glacier), which is near Ny-Ålesund (78° 55'N, 11° 56'E), Svalbard. Three hundred shoots with flowers and flower buds were randomly tagged in early July 1996. Between then and the end of flowering in late July, 100 (33%) flowers and buds were grazed by reindeer. Out of the surviving flowers, 145 (76%) shoots had hermaphrodite flowers, while 45 (24%) shoots had male flowers without a developed gynocium. Male flowers, which appeared later than hermaphrodite flowers in the population, were significantly smaller than hermaphrodite flowers in dry weight. In the hermaphrodite flowers, moreover, smaller flowers showed lower dry-weight allocation to the gynoecium as compared to larger flowers. During the observation, hermaphrodite flowers did not produce any developed seeds under a natural condition (0% seed-set). Cross-pollinated flowers showed 8% seed-set. On the other hand, flowers which were artificially warmed in small greenhouses during the flowering period showed 60% seed-set, regardless of cross-pollination or autodeposition of pollen from anthers to stigma (self-pollination). Thus, it was found that grazing, gender variation in relation to the length of the growing season and the flower size, and - in the floweriing period - low temperature rather than pollinator limitation strongly affected the seed production of D. octopetala in the population studied.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Bell, K. L. & Bliss, L. C. 1980: Plant reproduction in a high Arctic environment. Arctic Alp. Res. 12, 1-10,
    • Hultkn, E. 1959: Studies on the genus D q ~ a sS.verisk Bot. Tidskr. 53, 507-547.
    • Jefferies, R. L., Svoboda, J., Henry, G., Raillard, M. & Ruess, R. 1992: Tundra grazing systems and climatic change. In F. S . Chapin I11 et al. (eds.): Arctic ecosystems in u changing climuret an ecophysiological perspective. Pp. 39412. California: Academic Press.
    • Kelley. J . J. & Weaver, D. F. 1969: Physical processes at the surface of the Arctic tundra. Arctic 22, 425437.
    • Kevan. P. G. &Baker, H. G. 1983: Insects as flower visitors and pollinators. Annu. Rev. Entoni. 28, 407453.
    • Kjellberg, B., Karlsson. S. & Kerstensson, I. 1982: Effects of heliotropic movements of flowers of D n a s octopetuln L. on gynoecium temperature and seed development. Oecologiu 54. 10-13.
    • Klinkhamer. P. G. L. & de Jong. T. J. 1993: Phenotypic gender in plants: effects of plant size and environment on allocation to seeds and tlowers in Cyiloglossum officinule. Oikos 67. 81- 86.
    • Kudo, G. 1991: Effects of snow-free period on the phenology of alpine plants inhabiting snow patches. Arct. A/p, Rrs. 23. 43-43,
    • Kudo. G. 1993: Size-dependent resource allocation pattern and gender variation of Anetnone dehilis Fish. flanr Species B i d . 8, 29-34.
    • Kudo. G. 1997: Sex expression and fruit set of an andromonoecious herh. feucedunum mu/tivittatwn (Umbellifirde) along a snowmelt gradient. Opera Bot. 32. 121-128.
    • Lloyd, D. J. 1980: Sexual strategies in plants. 111. A quantitative method for describing the gender in plants. N . Z. J. Bot. 18, 103-1 08.
    • Lovett Doust, J. & Lovett Doust, L. 1988: Sociobiology of plants: an emerging synthesis. In J. Lovett Doust & L. Lovett Doust (eds.): Plant reproductive ecology Pattenis atid strategies. Pp. 5-29. New York: Oxford University Press.
    • McGraw, J. B. 1985: Environmental ecology of D n u s octopetulci ecotypes. 111. Environmental factors and plant growth. Arct. A/p. Res. 17. 229-239.
    • Maxwell. B. 1992: Arctic climate: potential for change under global warming. In F. S . Chapin 111 et al. (eds.): Arcrir ecosptrtns it] LI chaiigitig dimcite: an ecopliysiologicul prrspectice. Pp. 11-34. California: Academic Press.
    • Molau, U. 1993: Relationships between flowering phenology and life history strategies in tundra plants. Arct. Alp. Res. 25, 391-402.
    • Morishita, M. 1959: Measuring of dispersion of individuals and analysis of the distributional patterns. Memoir Faculty of Srience Kyushu University Series E (Biology) 2, 215-235.
    • Morishita, M. 1962: 18-index. a measure of dispersion of individuals. Res. l'opul. Ecol. 4, 1-7.
    • Philipp, M., Bocher, J., Mattsson, 0.& Woodell, S. R. J. 1990: A quantitative approach to the sexual reproductive biology and population structure in some Arctic flowering plant% Dr)us integrifolia, Silene acaulis and Ranunculus nivalis. Medd. Grgnland, Biosci. 34, 1-60.
    • Ronning, 0. 1. 1969: Features of the ecology of some Spitzbergen plant communities. Arct. Alp. Res. 1, 29-44.
    • Ronning, 0. I. 1996 Theflora of Svalbard. Pp. 66-67. Oslo: Norwegian Polar Institute.
    • Sih, A. & Baltus, M.-S. 1987: Patch size, pollinator behavior, and pollinator limitation in catnip. Ecology 68, 1679-1690.
    • Spira, T. P. & Pollack, 0. D. 1986: Comparative reproductive biology of alpine biennial and perennial gentians (Genriana: Gentianaceae) in California. Am. J. Bot. 73, 3 9 4 7 .
    • Thomson, J. D., Maddison, W. P. & Plowright, R. C. 1982: Behavior of bumble bee pollinators of Aralia hispida Vent. (Araliaceae). Oecologia 54, 326-336.
    • Totland, 0. 1994a: Influence of climate, time of day and season, and flower density on insect flower visitation in alpine Norway. Arct. Alp. Res. 26, 6 C 7 1 .
    • Totland, 0. 1994b: Intraseasonal variation in pollination intensity and seed-set in an alpine population of Rununculus acris in southwestern Norway. Ecography 17, 159-165.
    • Totland, 0. 1997: Effects of flowering time and temperature on growth and reproduction in Leontodon uuturnnalis var. raruxaci, a late-flowering alpine plant. Arcr. Alp. Res. 29, 285-290.
    • Wada, N., Kudo, G. & Kojima, S. 1999: Gender variation of D n m octopetala along snowmelt and latitudinal gradients in the subarctic and the high Arctic. Polar Biosci. 12, 87-99.
    • Welker, J. M., Molau, U., Parsons, A. N., Robinson, C. H. & Wookey, P. A. 1997: Responses of D v a s ocroperala to ITEX environmental manipulations: a synthesis with circumpolar comparisons. Global Change Biol. 3, 61-73.
    • Wookey, P. A,, Parsons, A. N., Welker, J. M., Potter, J. A,, Callaghan, T. V., Lee, J. A. & Press, M. C. 1993: Comparative responses of phenology and reproductive development to simulated environmental change in subArctic and high Arctic plants. Oikos 67, 490-502.
    • Wookey, P. A,, Robinson, C. H., Parsons, A. N., Welker, J. M., Press, M. C., Callaghan, T. V. & Lee, I. A. 1995: Environmental constraints on the growth, photosynthesis and reproductive development of Dryas octopetala at a high Arctic polar semi-desert, Svalbard. Oecologia 1 0 2 , 4 7 8 4 8 9 .
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article

Collected from