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 Pulsating abdomen
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| Alvesgaspar |
Posted on 28-10-2007 16:15
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 Member Location: Lisbon, Portugal Posts: 571 Joined: 24.08.07 |
Why many flies, and also wasps, pulsate their abdomens (up and down) when resting? Please forgive the naive question, should be pretty basic for most of you... Joaquim Gaspar Lisboa, Portugal |
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| jorgemotalmeida |
Posted on 28-10-2007 18:12
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
The function of abdominal wagging is not fully understood. Even I don?t know the answer.  Well, there is an hypothesis that asserts that.. "It looks like wasps talk to their babies about food using vibratory signals."What I found here: http://www.animalbehavior.org/ABS/Stars/Founders/founders_2001.html "It is necessary for the wagging abdomen to contact and scrape against the nest surface to make much sound. However, most (80% avg.) AW does contact the nest and produce large vibrations. If larvae are the intended receivers of the vibratory signal then their presence should effect abdominal wagging. To test this I removed all larvae from the nest for an hour and then replaced them. Sure enough, abdominal wagging completely stopped when larvae were absent, and started immediately when they were returned. (I should note that I was working with naturally occurring single foundress colonies. So there were no other possible adult receivers present.) " |
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| jorgemotalmeida |
Posted on 28-10-2007 18:17
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
"hey my kids what do you want to eat today???" - said the mummy wasp. "we waaaaanntt Rooooibos!!" -- say the "kindergaten" wasps "what the heck?? You should not take any more magic mushrooms!" - said her with very strong abdominal wagging. "hmm.. take it easy, mummy. We are just kidding. Hm... give us an Eresus spider.. they are so juicy.  " - reply the tiny wasps.."ok. I will try to get some... and leave that magic...." - finish her with a very strong pulsation. end for this non-sense story. Edited by jorgemotalmeida on 28-10-2007 18:19 |
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| Alvesgaspar |
Posted on 28-10-2007 18:59
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Member Location: Lisbon, Portugal Posts: 571 Joined: 24.08.07 |
Wow, thanks for the funny explanation I was convinced that was some kind of respiratory or circulatory (heart-beating) phenomenon. But there is a problem with the communication theory: all flies and wasps I saw wagging their bellies seemed to be alone  Joaquim |
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| jorgemotalmeida |
Posted on 28-10-2007 22:25
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
how do you know??? You must dig a lot. |
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| pierred |
Posted on 29-10-2007 06:56
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 Member Location: Paris (France) Posts: 1413 Joined: 21.04.05 |
Hello, About Eristalis spp., I think those flies pump with the abdomen when they feed on a flower. Edited by pierred on 29-10-2007 06:56 Pierre Duhem |
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| Alvesgaspar |
Posted on 29-10-2007 23:23
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Member Location: Lisbon, Portugal Posts: 571 Joined: 24.08.07 |
Not only Eristalis, many other syrphids do the same. Joaquim |
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| jorgemotalmeida |
Posted on 31-10-2007 11:11
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
Alvesgaspar wrote: Not only Eristalis, many other syrphids do the same. Joaquim Also many women do THE SAME when they do Womb Dance. |
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but don't see the image in the post.