Navigation Links
Biologists discover 'death stench' is a universal ancient warning signal
Date:9/11/2009

HAMILTON, Ont. September 11, 2009The smell of recent death or injury that repels living relatives of insects has been identified as a truly ancient signal that functions to avoid disease or predators, biologists have discovered.

David Rollo, professor of biology at McMaster University, found that corpses of animals, from insects to crustaceans, all emit the same death stench produced by a blend of specific fatty acids.

The findings have been published in the journal Evolutionary Biology.

Rollo and his team made the discovery while they were studying the social behavior of cockroaches. When a cockroach finds a good place to live it marks the site with pheromone odours that attract others. In trying to identify the precise chemicals involved, Rollo extracted body juices from dead cockroaches.

"It was amazing to find that the cockroaches avoided places treated with these extracts like the plague," says Rollo. "Naturally, we wanted to identify what chemical was making them all go away."

The team eventually identified the specific chemicals that signaled death. Furthermore, they found that the same fatty acids not only signaled death in ants, caterpillars, and cockroaches, they were equally effective in terrestrial woodlice and pill bugs that are actually not insects but crustaceans related to crayfish and lobsters.

Because insects and crustaceans diverged more than 400-million years ago it is likely that most subsequent species recognize their dead in a similar way, that the origin of such signals was likely even older, and that such behaviour initially occurred in aquatic environments (few crustaceans are terrestrial).

"Recognizing and avoiding the dead could reduce the chances of catching the disease, or allow you to get away with just enough exposure to activate your immunity," says Rollo. Likewise, he adds, release of fatty acids from dismembered body parts could provide a strong warning that a nasty predator was nearby.

"As explained in our study, fatty acidsoleic or linoleic acidsare reliably and quickly released from the cells following death. Evolution appears to have favoured such clues because they were reliably associated with demise, and avoiding contagion and predation are rather critical to survival."

The generality and strength of the phenomenon, coupled with the fact that the fatty acids are essential nutrients rather than pesticides, holds real promise for applications such as plant and stored product protection or exclusion of household pests.


'/>"/>

Contact: Jane Christmas
chrisja@mcmaster.ca
McMaster University
Source:Eurekalert

Related biology news :

1. UTSA plant biologists publish where their peers are -- on the Web
2. Microbiologists find defense molecule that senses respiratory viruses
3. Geobiologists propose that the earliest complex organisms fed by absorbing ocean buffet
4. Biologists rediscover endangered frog population
5. Smaller plants punch above their weight in the forest, say Queens biologists
6. Biologists devise unifying framework to explain evolutionary puzzles
7. Biologists consider unifying framework to explain evolutionary puzzles
8. CCNY, CSHL biologists find birdsong of isolates reverts to norm over several generations
9. FANTOM findings boost for biologists
10. Penn biologists discover how silent mutations influence protein production
11. UIC biologists use DNA to study migration of threatened whale sharks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/26/2016)... and LONDON , April ... part of EdgeVerve Systems, a product subsidiary of ... today announced a partnership to integrate the Onegini ...      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ) ... their customers enhanced security to access and transact ...
(Date:4/14/2016)... Israel , April 14, 2016 ... Authentication and Malware Detection, today announced the appointment of ... assumed the new role. Goldwerger,s leadership appointment ... on the heels of the deployment of its platform ... BioCatch,s behavioral biometric technology, which discerns unique cognitive and ...
(Date:3/23/2016)... , March 23, 2016 ... Interesse erhöhter Sicherheit Gesichts- und Stimmerkennung mit ... Inc. (NASDAQ: MESG ), ein ... dass das Unternehmen mit SpeechPro zusammenarbeitet, um ... der Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, im ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... , June 24, 2016 Epic Sciences ... detects cancers susceptible to PARP inhibitors by targeting ... cells (CTCs). The new test has already been ... in multiple cancer types. Over 230 ... damage response pathways, including PARP, ATM, ATR, DNA-PK ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... is pleased to announce the launch of their brand, UP4™ Probiotics, into Target ... over 35 years, is proud to add Target to its list of well-respected ...
(Date:6/23/2016)... HOUSTON , June 23, 2016 ... agreement with the Cy-Fair Sports Association to serve ... of the agreement, Houston Methodist Willowbrook will provide ... education and connectivity with association coaches, volunteers, athletes ... partner with the Cy-Fair Sports Association and to ...
(Date:6/23/2016)... , June 23, 2016   EpiBiome , a ... $1 million in debt financing from Silicon Valley Bank ... automation and to advance its drug development efforts, as ... facility. "SVB has been an incredible strategic ... services a traditional bank would provide," said Dr. ...
Breaking Biology Technology: