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- Title
ECOLOGY AND EVOLUTION OF SELF-POLLINATION IN ARENARIA UNIFLORA (CARYOPHYLLACEAE).
- Authors
Wyatt, R.
- Abstract
(1) Populations of the rock outcrop endemic plant Arenaria uniflora were sampled from nine sites in the south-eastern United States. (2) Ecological data from each site suggested why cross-pollinated morphs occur in the central portion of the range while self-pollinated morphs are restricted to the margins. (3) Demographic analysis revealed distinct differences between sites and between years in density and survivorship of plants. Within-site transplants performed better than between-site transplants, especially in dry years. (4) The plants are pollinated chiefly by syrphid flies and andrenid and halictid bees, which are abundant even in those areas where self-pollinated morphs predominate. (5) There was no relationship between environmental variability and the occurrence of self-pollinated versus cross-pollinated morphs. (6) It is hypothesized that the stimulus for the evolution of self-pollination in A. uniflora was competition for pollinators. Arenaria glabra, another winter annual endemic to rock outcrops in the south-east, is pollinated by the same flies and bees as A. uniflora but has a larger, showier floral display. Wherever A. glabra grows together with A. uniflora, it is the self-pollinated morphs of the latter that occur.
- Subjects
UNITED States; POLLINATION by insects; PLANT evolution; PLANT self-incompatibility; CARYOPHYLLACEAE; SYRPHIDAE; ANDRENIDAE; HALICTIDAE; SANDWORTS; ENDEMIC plants; INSECT pollinators; PLANT populations; PLANT ecology
- Publication
Journal of Ecology, 1986, Vol 74, Issue 2, p403
- ISSN
0022-0477
- Publication type
Article
- DOI
10.2307/2260264