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Apidologie

, Volume 42, Issue 3, pp 401–408 | Cite as

Nectar and pollen sugars constituting larval provisions of the alfalfa leaf-cutting bee (Megachile rotundata) (Hymenoptera: Apiformes: Megachilidae)

  • James H. Cane
  • Dale R. Gardner
  • Philip A. Harrison
Original article

Abstract

As with most solitary bees, larvae of the alfalfa leaf-cutting bee, Megachile rotundata Fab., eat a diet blended from pollen and nectar of unknown proportions. In this study, we developed protocols to isolate and quantify sugars from larval provision masses. The method removed free amino acids that leach from pollen and confound chromatography, but without autohydrolyzing sucrose. Pollen sugars were a negligible fraction of provision mass sugars. Glucose and fructose constituted about half of the provision fresh weight. Sucrose in alfalfa pollen and nectar is absent from the provision, presumably enzymatically hydrolyzed to glucose and fructose in the provision. Provision masses are composed of two to three times more floral equivalents in pollen than nectar. Female M. rotundata, and other solitary bees with pasty provisions, gather proportionally more pollen than nectar compared with the resource needs of colonies of social honeybees and bumblebees.

Keywords

HPLC Medicago pollinator Apoidea diet 

Notes

Acknowledgments

We are grateful to Don Veirs for able assistance in acquiring and processing alfalfa nectar and larval provisions, to Faye Rutishauser for help with particle counting, and to Terry Wierenga for guidance with HPLC. Theresa Pitts-Singer and John Neff provided thoughtful reviews. Research was funded by the Pacific Northwest Alfalfa Seed Growers Association.

Sucres du nectar et du pollen contenus dans les provisions destinées à l’alimentation des larves chez Megachile rotundata (Hymenoptera: Apiformes: Megachilidae).

HPLC / Medicago / pollinisateur / régime alimentaire / luzerne / Apoidea

Zusammenfassung - Nektar- und Pollenzucker als Komponenten des Larvenfutters der Blattschneiderbiene Megachile rotundata (Hymenoptera: Apiformes: Megachilidae). Wie bei den meisten solitären Bienen erhalten auch die Larven der Blattschneiderbiene Megachile rotundata Fab. eine Diät bestehend aus einer Mischung nicht genau bekannter Anteile von Pollen und Nektar. In der vorliegenden Studie entwickelten wir ein Verfahren zur Isolierung und Quantifizierung der Zucker im Larvenfuttter. Die Methode entfernt aus Pollen herausgelöste freie Aminosäuren, die in der Chromatographie stören können., ohne dass es zur Autohydrolyse von Zuckern kommt. Während Pollenzucker nur einen geringen Anteil der Zuckerfraktion im Larvenfutter von M. rotundata ausmachten, waren Glukose und Fruktose zu etwa 50% im Frischgewicht der Futtermenge vertreten. Sacharose, die in Alfalfapollen und Nektar vorkommt, war im Larvenfutter nicht zu finden, da sie vermutlich bei der Futteraufbereitung enzymatisch in Glukose und Fruktose gespalten wird. Im Vergleich zu Arbeiterinnen der sozialen Honigbienen und Hummeln sammeln Weibchen von M. rotundata, wie auch die anderer solitärer Bienen, die ihre Brut mit einem pastenartigen Brei füttern, proportional mehr Pollen als Nektar von den Futterpflanzen ein. Der flüssige Anteil im Futterbrei garantiert die Verpflegung der ersten drei Larvenstadien der Blattschneiderbienen, während ein zu trockener Futterbrei mit einer erhöhten Larvenmortalität verbunden ist.

HPLC / Medicago / Bestäuber / Apoidea / Diät

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Copyright information

© INRA, DIB-AGIB and Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • James H. Cane
    • 1
  • Dale R. Gardner
    • 2
  • Philip A. Harrison
    • 3
  1. 1.USDA-ARS Bee Biology and Systematic LaboratoryUtah State UniversityLoganUSA
  2. 2.USDA-ARS Poisonous Plant Research LaboratoryUtah State UniversityLoganUSA
  3. 3.USDA-ARS Forage and Range Research LaboratoryUtah State UniversityLoganUSA

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