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The role of the pollination niche in community assembly of Erica species in a biodiversity hotspot

Journal of Plant Ecology 2017年第4期10卷 634-648页

作者： Roderick W.Bouman Sandy-Lynn Steenhuisen Timotheüs van der Niet Naturalis Biodiversity Center Understanding Evolution GroupDarwinweg 42333 CR LeidenThe Netherlands Leiden University Sylviusweg 722333 BE LeidenThe Netherlands Hortus Botanicus Leiden 5e Binnenvestgracht 82311 VH LeidenThe Netherlands Department of Biological Sciences University of Cape TownPrivate Bag X3Rondebosch 7701South Africa School of Life Sciences University of KwaZulu-NatalPrivate Bag X01Scottsville 3209South Africa

Aims Closely related species frequently co-occur in plant *** role of niche partitioning for allowing their coexistence has been called into question,but most studies on community ecol-ogy neglect pollination as a niche component,and thus poten-tially underestimate niche ***,we investigate the importance of the pollination niche for determining coexistence in a biodiversity *** specifically test whether co-flowering insect-pollinated species of Erica,the most species-rich plant genus of the South African cape floristic region,are characterized by dif-ferent functional floral traits and different specialized pollination *** Communities of co-flowering Erica species were studied at three sites in the fynbos biome in the Western cape of South *** focused on five species with flowers that conform to an insect pol-lination *** assessed whether floral traits important for pollinator attraction and mechanical fit overlap by comparison of scent(gas chromatography coupled with mass spectrometry),col-our(spectrophotometry and models of bee vision),nectar volume and concentration and corolla *** partitioning was quantified by comparison of floral visitor profiles and pollinator importance,calculated as the product of visitation rate,number of flowers probed per visit and pollen load for each functional visitor group among species within *** effects of com-petition were assessed by comparing visitation rates both directly and using anther ring disturbance as a proxy for lifetime *** Findings Floral phenotypes differed among species within communities in all functional *** assemblages were diverse,including ants,beetles,flies,honeybees,moths and solitary ***,the cape honeybee,Apis mellifera capensis,was the main pollinator of all but one Erica *** visitation rates were significantly lower for *** and *** relative to congene

关键词： cape floristic region coexistence floral traits heaths pollination niche

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