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Titre du document / Document title

Reproductive success of Baker's globe mallow and its association with a native specialist bee

Auteur(s) / Author(s)

ARNESON Laura C. ; TEPEDINO Vincent J. ; SMITH Sheri L. ;

Résumé / Abstract

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 Diadasia nitidifrons is vital to the reproductive success of Baker's globe mallow if it proves to be superior to generalist bees at pollen deposition. Pollinator effectiveness comparisons for abundant visitors are needed.

Revue / Journal Title

Northwest science    ISSN  0029-344X   CODEN NOSCAX 

Source / Source

2004, vol. 78, no2, pp. 141-149 [9 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Washington State University, Pullman, WA, ETATS-UNIS  (1927) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 11233, 35400011191716.0060

Nº notice refdoc (ud4) : 15770965



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