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Yeasts in floral nectar: a quantitative survey.

Carlos M Herrera¹, Clara de Vega, Azucena Canto

¹Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas, Sevilla, Spain. herrera@cica.es

Annals of Botany

|February 12, 2009

Summary

Floral nectar commonly harbors abundant yeast cells, with their presence and density linked to specific pollinator types like bumble-bees. This highlights the ecological role of nectar-dwelling microorganisms in plant-pollinator interactions.

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Area of Science:

Ecology
Microbiology
Plant Science

Background:

Floral nectar, ecologically significant, is an understudied habitat for microorganisms.
This study investigates yeast presence and abundance in nectar across diverse plant communities.

Purpose of the Study:

To assess yeast occurrence and density in floral nectar of insect-pollinated plants.
To explore correlations between yeast incidence and pollinator composition.

Main Methods:

Microscopic examination of floral nectar samples from 130 plant species across Spain and Mexico.
Investigated relationships between nectar yeasts and pollinator visitation proportions at a Spanish site.

Main Results:

Yeasts were frequently found in nectar, sometimes at densities up to 4 x 10^5 cells/mm³.
Yeast abundance correlated positively with bumble-bee visits and negatively with solitary bee visits.

Conclusions:

Nectar yeasts are ubiquitous and abundant, influencing plant-pollinator interactions.
Future studies on nectar chemistry must account for yeast presence and metabolic activity.