AOBPreview originally published online on December 22, 2005
Annals of Botany 2006 97(3):413-421; doi:10.1093/aob/mcj043
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Nectar Concentration and Composition of 26 Species from the Temperate Forest of South America
1 Laboratorio Ecotono, Universidad Nacional del Comahue, Quintral 1250, 8400, Bariloche, Argentina and 2 Instituto Multidisciplinario de Biologia Vegetal (CONICET—UNC), Casilla de Correo 495, 5000, Cordoba, Argentina
* For correspondence. E-mail vchalcoff{at}crub.uncoma.edu.ar
Received: 31 August 2004 Returned for revision: 1 November 2005 Accepted: 9 November 2005 Published electronically: 22 December 2005
• Background and Aims Floral nectar concentration and chemical composition of 26 plant species native to the temperate forest of southern South America are reported and the relationships with the flower type are evaluated.
• Methods Nectar concentration was measured with a hand refractometer and sugar composition was analysed by gas–liquid chromatography. Plant species were classified into flower type categories based not only on floral features but also on data from the literature and field observations on their pollinators.
• Key Results Most data on nectar are new reports at the generic and/or specific level. Plant species in which more than one population was studied showed significant among-population variation in nectar sugar concentration and composition. Results showed a weak relationship between nectar traits and flower type. Many species had nectar containing 50 % or more sucrose (17 of 26 species), independent of the main pollinator.
• Conclusions Considering that (a) nectar characteristics did not show a clear association with different flower types or with plant taxonomic membership, and (b) different populations of the same species showed large variability in sugar composition, the results suggest that other factors (e.g. historical and environmental) could be involved in determining the sugar composition of the highly endemic plant species from this region.
Key words: Nectar sugar composition, sugar concentration, flower type, pollination, hummingbirds, diurnal insects, nocturnal insects, temperate forest of southern South America
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