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Wildfire and floral herbivory alter reproduction and pollinator mutualisms of Yuccas and Yucca moths

Journal of Plant Ecology 2017年第5期10卷 851-858页

作者： Andrew H.Lybbert Samuel B.St.Clair Department of Evolution Ecology and Organismal BiologyThe Ohio State UniversityColumbusOH 43210USA Department of Plant and Wildlife Sciences Brigham Young UniversityProvoUT 84602USA

Aims Wildfire and ungulate herbivore pressure are increasing globally due to human activities,including arid ecosystems that are sensitive to disturbance,and are highly dependent on pollinator *** evaluated how wildfire and ungulate herbivore pressure influ-ence plant reproductive success and pollinator *** We evaluated flower production,floral herbivory,pollinator visita-tion and fruit set of two Yucca species with highly specialized polli-nator mutualisms(Yucca baccata and Yucca brevifolia)in unburned and burned landscapes created by fires that occurred in the mojave desert in *** Findings Yucca baccata plants in burned landscapes had a greater propor-tion of flowering individuals than plants in unburned areas(23 versus 12%).All *** individuals in burned and unburned landscapes produced ***-four percent of *** inflorescences were removed due to herbivory by cattle in burned areas,compared to 51%in unburned ***-two percent of *** inflorescences on branches≤2 m in height were removed in burned areas due to cattle herbivory compared to 39%in unburned ***,we did not observe any inflores-cence removal on *** branches>2 m where the major-ity of *** inflorescences are *** moths,the only known pollinators of these two species,visited *** uniformly in burned and unburned areas but failed to visit ***-cata *** brevifolia had strong fruit production,but not a single fruit was produced among the thousands of flowering *** plants *** herbivory and the loss of obligate pollinator mutualisms appear to be critical threats to the long-term viability of *** populations in this *** reproduc-tive resilience of *** and the maintenance of its pollinator populations appear to be due to its taller stature,which allows verti-cal escape of flowers from ungulate *** of live-stock during

关键词： cattle disturbance mojave desert pollination Yucca brevifolia Yucca baccata

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