Effects of Infection on Honey Bee Population Dynamics: A Model
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  1. #1
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    Default Effects of Infection on Honey Bee Population Dynamics: A Model

    Effects of Infection on Honey Bee Population Dynamics: A Model
    We propose a model that combines the dynamics of the spread of disease within a bee colony with the underlying demographic dynamics of the colony to determine the ultimate fate of the colony under different scenarios. The model suggests that key factors in the survival or collapse of a honey bee colony in the face of an infection are the rate of transmission of the infection and the disease-induced death rate. An increase in the disease-induced death rate, which can be thought of as an increase in the severity of the disease, may actually help the colony overcome the disease and survive through winter. By contrast, an increase in the transmission rate, which means that bees are being infected at an earlier age, has a drastic deleterious effect. Another important finding relates to the timing of infection in relation to the onset of winter, indicating that in a time interval of approximately 20 days before the onset of winter the colony is most affected by the onset of infection. The results suggest further that the age of recruitment of hive bees to foraging duties is a good early marker for the survival or collapse of a honey bee colony in the face of infection, which is consistent with experimental evidence but the model provides insight into the underlying mechanisms. The most important result of the study is a clear distinction between an exposure of the honey bee colony to an environmental hazard such as pesticides or insecticides, or an exposure to an infectious disease. The results indicate unequivocally that in the scenarios that we have examined, and perhaps more generally, an infectious disease is far more hazardous to the survival of a bee colony than an environmental hazard that causes an equal death rate in foraging bees.

    http://www.plosone.org/article/info%...l.pone.0110237
    americasbeekeeper.com
    [email protected]

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  3. #2
    Join Date
    Jul 2013
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    Morro Bay, California, USA
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    Default Re: Effects of Infection on Honey Bee Population Dynamics: A Model

    Quote Originally Posted by AmericasBeekeeper View Post
    An increase in the disease-induced death rate, which can be thought of as an increase in the severity of the disease, may actually help the colony overcome the disease and survive through winter. By contrast, an increase in the transmission rate, which means that bees are being infected at an earlier age, has a drastic deleterious effect.
    http://www.plosone.org/article/info%...l.pone.0110237
    Others have written about self-sacrifice suicide among workers -- crawler bees. This paper provides a mathematical basis for the fitness advantage of seeing infected bees leave the hive and die.

  4. #3

    Default Re: Effects of Infection on Honey Bee Population Dynamics: A Model

    http://citeseerx.ist.psu.edu/viewdoc...=10.1.1.9.7475

    http://scholar.google.fi/scholar_url...=0CCEQgAMoAjAA

    Here in Europe there has always been quite a lot of astonishment about the use of antibiotics against AFB in US. In Europe the use of antibiotics has been forbidden for decades.

    Fries et. al. suggest that the virulence of AFB might be because of apicultural practises. Maybe not because of the use of antibiotics, but big yards with lots of robbing compared to low density of hives in natural environment.

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