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  1. #1
    Join Date
    Oct 2007
    Location
    VENTURA, California, USA
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    Default The thermology of wintering honey bee colonies

    Here is data that is very detailed about the clustering of bees:

    THE THERMOLOGY OF WINTERING HONEY BEE COLONIES

    By CHARLES D. OWENS, Agricultural Engineering Research Division,
    Agricultural Research Service

    All tests were conducted at Madison, Wis., from December 1 to March 31 for 5 years.


    http://www.beesource.com/pov/usda/th...lletin1429.htm

    SUMMARY

    Thermocouples were established in different planes in a hive of wintering honey bees (Apis mellifera L.) at Madison, Wis., and temperatures were determined. Then the colony was killed with gas. Exact determination of the cluster location in relation to recorded temperatures proved that such temperature records precisely locate the cluster and show where brood is being reared, where bee activity occurs beyond the brood area, and the insulating shell of relatively inactive bees.

    From 1,200,000 thermocouple temperature determinations made in beehives during the winter, the following information was obtained:
    (1 of 20)

    (1) Temperature readings permit determination of the cluster size, shape, movement, and brood-rearing activities.

    Regards,
    Ernie
    Ernie
    My websitehttp://bees4u.com/

  2. #2
    Join Date
    Jan 2005
    Location
    Southern Oregon
    Posts
    1,144

    Default More great stuff on hive thermoregulation

    http://jeb.biologists.org/cgi/conten...ct/206/23/4217
    http://jeb.biologists.org/cgi/content/full/206/23/4181
    http://www.pnas.org/content/100/12/7343.full.pdf Must read!!

    Fascinating stuff. Brood nest temperatures can have huge impacts on memory and learning. The results for brood reared at cooler temps in that last study are reminiscent of some of the CCD symptoms. Perhaps as field and cluster heater bees are lost the developing larvae become less able to learn and remember thus compounding the situation.
    Last edited by JBJ; 02-17-2009 at 10:04 AM. Reason: specificity
    John B Jacob www.oldsolbees.com

  3. #3
    Join Date
    Oct 2007
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    VENTURA, California, USA
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    3,637

    Default Brood nest temperatures can have huge impacts

    Thanks for the excellent data.
    I will read it in detail later today.
    I thought that the movement of the wintering cluster was also of interest and the hives brooding charts.

    Ernie
    Ernie
    My websitehttp://bees4u.com/

  4. #4
    Join Date
    Jan 2005
    Location
    Southern Oregon
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    Default

    Ernie, I would say the first 2 articles I posted reinforce the why and how on the article you posted, they seem to fit nicely together.
    John B Jacob www.oldsolbees.com

  5. #5
    Join Date
    Jan 2009
    Location
    Swalwell, AB
    Posts
    581

    Default

    Good stuff.

    Bees raised at 36C performed as expected for bees typically classified as ‘‘good learners,’’ whereas bees raised at 32C and 34.5C performed significantly less well. We propose that the temperature at which pupae are raised will influence their behavioral performance as adults and may determine the tasks they carry out best inside and outside the hive.
    FWIW,

    32 Celsius degree = 89.6 Fahrenheit degree
    34.5 Celsius degree = 94.1 Fahrenheit degree
    36 Celsius degree = 96.8 Fahrenheit degree

    from
    http://www.convertit.com/Go/ConvertI.../Converter.ASP

    I have heard that some queen raisers slow development to suit their schedule by controlling temp. Also, in baby nucs, queen cells often get cooled below optimal temps. How important are learning abilities in queens? Does the same apply?

  6. #6
    Join Date
    Jan 2005
    Location
    Southern Oregon
    Posts
    1,144

    Default

    "...bees were vibrating their thoracic muscles and reaching temperatures up to 41C. (107.6F)" Phillips

    That is pretty toasty, I wonder what volume of honey it would take to generate that much heat in Calories? One of you physicist types out there should relish such a thermodynamics calculation.
    Last edited by JBJ; 02-17-2009 at 10:26 PM. Reason: omisssion
    John B Jacob www.oldsolbees.com

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