Derek Mitchell - Ratios of colony mass to thermal conductance of tree and man-made nest enclosures ....

Please place treatment free research here. There's a lot of research spread around the Internet that is related to treatment free beekeeping. This forum is an effort to try and consolidate some of this, especially new research as it becomes available.
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GregV
Backyard Beekeeper
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Derek Mitchell - Ratios of colony mass to thermal conductance of tree and man-made nest enclosures ....

Postby GregV » Tue Oct 03, 2017 3:33 pm

Abstract:

In the absence of human intervention, the honeybee (Apis mellifera L.) usually constructs its nest in a tree within a tall, narrow, thick-walled cavity high above the ground (the enclosure); however, most research and apiculture is conducted in the thin-walled, squat wooden enclosures we know as hives. This experimental research, using various hives and thermal models of trees, has found that the heat transfer rate is approximately four to seven times greater in the hives in common use, compared to a typical tree enclosure in winter configuration. This gives a ratio of colony mass to lumped enclosure thermal conductance (MCR) of less than 0.8 kgW−1 K for wooden hives and greater than 5 kgW−1 K for tree enclosures. This result for tree enclosures implies higher levels of humidity in the nest, increased survival of smaller colonies and lower Varroa destructor breeding success. Many honeybee behaviours previously thought to be intrinsic may only be a coping mechanism for human intervention; for example, at an MCR of above 2 kgW−1 K, clustering in a tree enclosure may be an optional, rare, heat conservation behaviour for established colonies, rather than the compulsory, frequent, life-saving behaviour that is in the hives in common use. The implied improved survival in hives with thermal properties of tree nests may help to solve some of the problems honeybees are currently facing in apiculture.

https://link.springer.com/article/10.10 ... 015-1057-z

(I don't feel like spending $40 for the original manuscript; so far did not find a free download yet).

PS: basically, need to put bees back into normal living conditions first....
then address any issues if any still left
(outside of poisoning them with pesticides, should be no issues left to speak of)

moebees
Backyard Beekeeper
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Location: Illinois

Re: Derek Mitchell - Ratios of colony mass to thermal conductance of tree and man-made nest enclosures ....

Postby moebees » Tue Oct 03, 2017 6:55 pm

Interesting and thanks for posting Greg. It will probably become available after a few months.
Sam Droege, a biologist for the U.S. Geological Survey—“bees are not optional."


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