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Waggle dance : ウィキペディア英語版
Waggle dance

Waggle dance is a term used in beekeeping and ethology for a particular figure-eight dance of the honey bee. By performing this dance, successful foragers can share, with other members of the colony, information about the direction and distance to patches of flowers yielding nectar and pollen, to water sources, or to new nest-site locations. A waggle dance with a very short waggle run used to be characterized as a distinct (round) recruitment dance (see below). Austrian ethologist and Nobel laureate Karl von Frisch was one of the first who translated the meaning of the waggle dance.〔Frisch, Karl von. (1967) The Dance Language and Orientation of Bees. Cambridge, Mass.: The Belknap Press of Harvard University Press.〕
==Description==

A waggle dance consists of one to 100 or more circuits, each of which consists of two phases: the waggle phase and the return phase. A worker bee's waggle dance involves running through a small figure-eight pattern: a waggle run (aka waggle phase) followed by a turn to the right to circle back to the starting point (aka return phase), another waggle run, followed by a turn and circle to the left, and so on in a regular alternation between right and left turns after waggle runs. Waggle-dancing bees produce and release two alkanes, tricosane and pentacosane, and two alkenes, (''Z'')-9-tricosene and (''Z'')-9-pentacosene, onto their abdomens and into the air.
The direction and duration of waggle runs are closely correlated with the direction and distance of the resource being advertised by the dancing bee. For cavity-nesting honey bees, like ''Apis mellifera'' or ''Apis nigrocincta'', flowers that are located directly in line with the sun are represented by waggle runs in an upward direction on the vertical combs, and any angle to the right or left of the sun is coded by a corresponding angle to the right or left of the upward direction. The distance between hive and recruitment target is encoded in the duration of the waggle runs.〔〔Radloff, Sara E.; Hepburn, H. Randall; Engel, Michael S. (2011). ''Honeybees of Asia''. Berlin: Springer Science & Business Media. ISBN 978-3642164217.〕 The farther the target, the longer the waggle phase. The more excited the bee is about the location, the more rapidly it will waggle, so it will grab the attention of the observing bees, and try to convince them. If multiple bees are doing the waggle dance, it's a competition to convince the observing bees to follow their lead, and competing bees may even disrupt other bees' dances or fight each other off. In addition, some open-air nesting honeybees, like ''Apis andreniformis'', whose nests hang from twigs or branches, will perform a horizontal dance on a stage above their nest in order to signal to resources.
Waggle dancing bees that have been in the nest for an extended time adjust the angles of their dances to accommodate the changing direction of the sun. Therefore, bees that follow the waggle run of the dance are still correctly led to the food source even though its angle relative to the sun has changed.
The consumption of ethanol by foraging bees has been shown to reduce waggle dance activity and increase occurrence of the tremble dance.
Kevin Abbott and Reuven Dukas of McMaster University in Hamilton, Ontario, Canada discovered that if a dead ''Apis mellifera'' bee is placed on a flower, bees performed far fewer waggle dances upon returning to the hive. The scientists explain that the bees associate the dead bee with the presence of a predator at the food source. The reduction of the dance repetition frequency, therefore, indicates that the dancing bees perform and communicate a form of risk/benefit analysis.〔

Though first decoded by Karl von Frisch, dancing behavior in bees had been observed and described multiple times prior. Around 100 years before Frisch's discovery, Nicholas Unhoch described dancing behavior of bees as being an indulgence “in certain pleasures and jollity”.〔 He did, however, admit ignorance as to the purpose of the dancing. 35 years prior to Unhoch's observations, Ernst Spitzner observed bees dancing and interpreted it as transmitting forage resource odors to other nestmates.〔 Even Aristotle, in addition to describing flower constancy behavior, suspected that some form of communication occurred between foragers within a nest:

"On each trip the bee does not fly from a flower of one kind to a flower of another, but flies from one violet, say, to another violet, and never meddles with another flower until it has got back to the hive; on reaching the hive they throw off their load, and each bee on her return is followed by three or four companions. What it is that they gather is hard to see, and how they do it has not been observed".〔Aristotle, ''Historia animalium, IX'', 40, Becker 624b; modified from the translation by D.W. Thompson in ''The Works of Aristotle'', Clarendon, Oxford, 1910.〕

Jürgen Tautz also writes about it in his book "The Buzz about Bees":

Page 112: Many elements of the communication used to recruit miniswarms to feeding sites are also observed in "true" swarming behavior. Miniswarms of foragers are not placed under the same selection pressure as are true swarms, because the fate of the entire colony is not at stake. A truly swarming colony has to be quickly led to a new home, or it will perish. The behavior used to recruit to food sources possibly developed from the "true" swarming behavior.
Tautz,J.: The Buzz about Bees - Biology of a Superorganism (photos by H. R. Heilmann) Springer Heidelberg & Berlin, 2008


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