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Apidologie

, Volume 42, Issue 4, pp 508–518 | Cite as

Food manipulation in honeybees induces physiological responses at the individual and colony level

  • Laura Evins Willard
  • Ashley Maria Hayes
  • Megan Ann Wallrichs
  • Olav RueppellEmail author
Original article

Abstract

Apis mellifera experiences large population declines in the USA and honeybee health is affected by many, potentially interacting factors that need to be addressed through a variety of approaches. In this context, we evaluated the impact of nutritional manipulations on worker physiology and colony demography. Specifically, we manipulated protein availability by feeding colonies on royal jelly, low-quality pollen, or regular pollen stores. After acclimation to these treatments, experimental cohorts of workers were introduced and later assessed with regards to life expectancy, protein content, and intestinal stem cell proliferation. We also monitored their hives for the amount of workers, brood, and pollen trapped in front of the hive entrances. Workers that fed on royal jelly showed a reduced rate of intestinal stem cell proliferation at nurse bee age. Total soluble protein content of individuals and adult worker lifespan were not systematically affected. However, we cannot exclude an auxiliary role of poor nutrition to declining bee health by weakening the intestinal epithelium. In contrast to the weak experimental effects on individual variables, the brood production differed drastically among the experimental hives. Although not yet replicated, this observation might indicate that hive demographic plasticity rather than individual plasticity is important for acclimation to different food regimes.

Keywords

intestinal stem cells pollen nutrition demographic plasticity mortality 

Notes

Acknowledgements

We thank Kaitlin Clinnin for practical support at the early stages of this experiment. We would also like to acknowledge the financial support of the North American Pollinator Protection Campaign and the Agriculture and Food Research Initiative of the USDA National Institute of Food and Agriculture, grant number #2010-65104-20533.

La manipulation des sources de nourriture chez les abeilles provoque des réponses physiologiques au niveau de l’individu et de la colonie.

cellule souche intestinale / pollen/ nutrition / plasticité démographique / mortalité

Zusammenfassung – Physiologische Reaktionen auf Manipulationen des Nahrungsangebots von Individuen und Völkern. Die aktuellen Gesundheitsprobleme der Honigbienen sind vermutlich auf mehrere Faktoren zurückzuführen und daher werden vielfältige Ansätze verfolgt. In diesem Zusammenhang wurden Bienen in dieser Studie am Polleneintrag in den Stock gehindert und stattdessen entweder mit minderwertigen Pollen oder mit frischem Futtersaft (Gelee Royale) gefüttert. Nach einer Eingewöhnungsphase, wurden die zu untersuchenden, jungen Bienen in die Stöcke gegeben und später auf Proteingehalt und Replikation der Stammzellen im Darm untersucht. Zudem wurden die Koloniegrössen, Brutmengen, und die Masse des abgefangenen Pollens der Kolonien aufgezeichnet. Die experimentelle Manipulation der Ernährung im Stock wirkte sich auf individueller und Stock-Ebene aus. Die individuelle Mortalität von Arbeiterinnen und deren interne Proteintiter wurden allerdings kaum beeinträchtigt, aber die Futtersaftdiät führte im Ammenstadium zu einer signifikanten Reduzierung der Zellteilungsraten von Stammzellen in der Darmwand. Die Ernährungsqualität scheint die Darmwand zu beeinflussen. Am Ausgeprägtesten waren jedoch die Unterschiede bei der Brutmenge zwischen den drei Völkern. Dies könnte darauf hinweisen, dass die demografische Plastizität eines Bienenvolkes stärker ist als die individuelle physiologische Plastizität.

Intestinale Stammzellen / Pollen / Ernährung / Demographische Plastizität / Mortalität

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Copyright information

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

Authors and Affiliations

  • Laura Evins Willard
    • 1
  • Ashley Maria Hayes
    • 1
  • Megan Ann Wallrichs
    • 1
  • Olav Rueppell
    • 1
    Email author
  1. 1.Department of BiologyThe University of North Carolina at GreensboroGreensboroUSA

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