"Selbst-Medikamentation bei der Honigbiene"

  • Ganz interessantes paper, fuer jeden frei lesbar bei PLOS.one (auf englisch; Google uebersetzt aber willig) - Kurzzusammenfassung: Bienen sammeln verstaerkt Propolis nach Infektion mit Kalkbrut.


    Increased Resin Collection after Parasite Challenge: A
    Case of Self-Medication in Honey Bees?


    Michael D . Simone-Finstrom
    Maria Spivak


    Department of Entomology, North Carolina State University, Raleigh, North Carolina, United States of America
    Department of Entomology, University of Minnesota, St. Paul, Minnesota, United States of America


    Abstract
    The constant pressure posed by parasites has caused species throughout the animal kingdom to evolve suites of
    mechanisms to resist infection. Individual barriers and physiological defenses are considered the main barriers against
    parasites in invertebrate species. However, behavioral traits and other non-immunological defenses can also effectively
    reduce parasite transmission and infection intensity. In social insects, behaviors that reduce colony-level parasite loads are
    termed "social immunity." One example of a behavioral defense is resin collection. Honey bees forage for plant-produced
    resins and incorporate them into their nest architecture. This use of resins can reduce chronic elevation of an individual
    bee's immune response. Since high activation of individual immunity can impose colony-level fitness costs, collection of
    resins may benefit both the individual and colony fitness. However the use of resins as a more direct defense against
    pathogens is unclear. Here we present evidence that honey bee colonies may self-medicate with plant resins in response to
    a fungal infection. Self-medication is generally defined as an individual responding to infection by ingesting or harvesting
    non-nutritive compounds or plant materials. Our results show that colonies increase resin foraging rates after a challenge
    with a fungal parasite (Ascophaera apis: chalkbrood or CB). Additionally, colonies experimentally enriched with resin had
    decreased infection intensities of this fungal parasite. If considered self-medication, this is a particularly unique example
    because it operates at the colony level. Most instances of self-medication involve pharmacophagy, whereby individuals
    change their diet in response to direct infection with a parasite. In this case with honey bees, resins are not ingested but
    used within the hive by adult bees exposed to fungal spores. Thus the colony, as the unit of selection, may be responding to
    infection through self-medication by increasing the number of individuals that forage for resin.


    Gruesse
    Melanie

  • Hallo Melanie,


    gibt es eigentlich Erkenntnisse darüber, welche Pflanzen "besonders gutes Propolis" ergeben? Ähnlich wie man bei einem Standort die Bienenweidepflanzen berücksichtigt, könnte man ja auch über ein passendes Angebot von "Medizinsträuchern" nachdenken, um es den Bienen leichter zu machen, sich entsprechend zu versorgen.


    Gruß
    Ludger

  • In dem Artikel wurde wieder auf Pappeln als gängige Quelle verwiesen - zur Qualität hatte ich auch grad ein Paper in der Hand aber da ging es nur um den Vergleich eines fertigen Produktes mit frischen Alkoholextrakten. War nichts Neues: die frischen Extrakte schnitten besser ab in Sachen antibaktiereller Wirkung; die Wirkung wird auch mit der Lagerzeit schlechter...


    Melanie