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Titre du Document
Reproductive success of Baker's globe mallow and its association with a native specialist bee
ARNESON Laura C. ; TEPEDINO Vincent J. ; SMITH Sheri L.
Baker's globe mallow, a fire-following mallow endemic to the Modoc Plateau of northeast California and southern Oregon, has recently been designated a sensitive species. Management conservation decisions for such rare species are strengthened by information on natural history, but little is known about this plant. Our objectives are to describe aspects of its reproductive success in several occurrences of different burn age and size, to determine its need for pollinators in sexual reproduction, and to identify important flower-visitors. Reproductive success (fruits/flower, seeds/fruit) for Baker's globe mallow varied significantly across occurrences, and was not associated with age or size of burn. There were significant positive correlations between fruits/flower and site elevation, and with distance to nearest burn. There was no phenological pattern to fruit or seed production, nor were clumped plants more likely to produce fruits or seeds than isolated plants. Flowers did not set fruit or produce seeds without pollinator visitation. The most abundant flower-visitor in most occurrences was Diadasia nitidifrons, a native solitary bee that visits only flowers of plants in the mallow family. Diadasia nitidifrons was present in all Baker's globe mallow occurrences monitored, including those most isolated. The plant's need for pollinators, and the tendency for plants in occurrences with the highest visitation to set the highest proportion of fruits per flower, suggests that Diad
Washington State University
Northwest science A. 2004, vol. 78, n° 2, pp. 141-149 [9 pages]
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