Featured Research

from universities, journals, and other organizations

Parasites change bees brains, but not their behavior

Date:
July 17, 2013
Source:
BioMed Central Limited
Summary:
Honey bees infected with the parasitic mite, Varroa destructor, or the microsporidia, Nosema ceranae, have changes in the chemical profile of their skin and in their brains. Despite this, parasitized bees were not expelled from the hive, which, the authors say, supports the hypothesis that stressed bees leave the hive altruistically to prevent the spread of infection.

Bee infected with the parasitic mite, Varroa destructor.
Credit: A. Maisonnasse

Honey bees Apis mellifera) infected with the parasitic mite, Varroa destructor, or the microsporidia, Nosema ceranae, have changes in the chemical profile of their skin and in their brains, finds research in BioMed Central's open access journal BMC Ecology. Despite this, parasitized bees were not expelled from the hive, which, the authors say, supports the hypothesis that stressed bees leave the hive altruistically to prevent the spread of infection.

Related Articles


This study from INRA (French National Institute for Agricultural Research) investigated the effect of parasitization on honey bees living in hives at Avignon. Individual bees were infected with either the ectoparasite Varroa, which lives on the bees, or endoparasite Nosema, which invades their bodies, and reintroduced to the hive. After a few days the effect of infection on bees and their behavior was monitored.

Parasitization caused changes in the levels of active genes in the brains of infected bees. Varroa altered the activity of 455 genes, including genes involved in GABA and serotonin signaling, while Nosema affected 57. Twenty genes were common between the two infections and several of the up-regulated genes are involved in oxidative stress, neural function and foraging behavior. Parasitized bees also tended to have a higher viral infection as well, adding to their disease burden, -- even if they did not have physical symptoms.

Hydrocarbons on the cuticle of bees provide a 'family' scent allowing bees from the same hive to recognize each other. The levels of these chemicals was altered by infection with either the endo- or ecto-parasite nevertheless infected bees were treated as normal by other bees -- social interactions including antennal contact, grooming, feeding, and vibration, continued -- and they were not expelled from the hive.

Dr Cynthia McDonnell who led this study commented, "Parasitized bees tend to leave the colony earlier to perform foraging activity, which could lead to a significant depopulation of the colony. However, very few studies have analyzed the impact of parasites on bee phenotypes, e.g. brain and behavior. We found that parasitized bees were not attacked by their nestmates suggesting that they leave the hive voluntarily, perhaps in response to the changes in gene expression in their brains. This social removal and the underlying mechanism might be a general and conserved response to parasitism, given that it was observed with extremely different types of parasites"


Story Source:

The above story is based on materials provided by BioMed Central Limited. Note: Materials may be edited for content and length.


Journal Reference:

  1. Cynthia M McDonnell, Cιdric Alaux, Hugues Parrinello, Jean-Pierre Desvignes, Didier Crauser, Emma Durbesson, Dominique Beslay, Yves Le Conte. Ecto- and endoparasite induce similar chemical and brain neurogenomic responses in the honey bee (Apis mellifera). BMC Ecology, 2013; 13 (1): 25 DOI: 10.1186/1472-6785-13-25

Cite This Page:

BioMed Central Limited. "Parasites change bees brains, but not their behavior." ScienceDaily. ScienceDaily, 17 July 2013. <www.sciencedaily.com/releases/2013/07/130717051738.htm>.
BioMed Central Limited. (2013, July 17). Parasites change bees brains, but not their behavior. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2013/07/130717051738.htm
BioMed Central Limited. "Parasites change bees brains, but not their behavior." ScienceDaily. www.sciencedaily.com/releases/2013/07/130717051738.htm (accessed October 31, 2014).

Share This



More Plants & Animals News

Friday, October 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

How A Chorus Led Scientists To A New Frog Species

How A Chorus Led Scientists To A New Frog Species

Newsy (Oct. 30, 2014) — A frog noticed by a conservationist on New York's Staten Island has been confirmed as a new species after extensive study and genetic testing. Video provided by Newsy
Powered by NewsLook.com
Surfer Accidentally Stands on Shark, Gets Bitten

Surfer Accidentally Stands on Shark, Gets Bitten

AP (Oct. 30, 2014) — A 20-year-old competition surfer said on Thursday he accidentally stepped on a shark's head before it bit him off the Australian east coast. (Oct. 30) Video provided by AP
Powered by NewsLook.com
Ebola Inflicts Heavy Toll on Guinean Potato Trade

Ebola Inflicts Heavy Toll on Guinean Potato Trade

AFP (Oct. 30, 2014) — The Ebola epidemic has seen Senegal and Guinea Bissau close its borders with Guinea and the economic consequences have started to be felt, especially in Fouta Djallon, where the renowned potato industry has been hit hard. Duration: 02:01 Video provided by AFP
Powered by NewsLook.com
Genetically Altered Glowing Flower on Display in Tokyo

Genetically Altered Glowing Flower on Display in Tokyo

Reuters - Innovations Video Online (Oct. 30, 2014) — Just in time for Halloween, a glowing flower goes on display in Tokyo. Instead of sorcery and magic, its creators used science to genetically modify the flower, adding a naturally fluorescent plankton protein to its genetic mix. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins