{"id":2457442,"date":"2020-10-19T14:24:57","date_gmt":"2020-10-19T18:24:57","guid":{"rendered":"https:\/\/www.futurity.org\/?p=2457442"},"modified":"2020-10-19T14:24:57","modified_gmt":"2020-10-19T18:24:57","slug":"honey-bees-gut-bacteria-microbiome-2457442-2","status":"publish","type":"post","link":"https:\/\/www.futurity.org\/honey-bees-gut-bacteria-microbiome-2457442-2\/","title":{"rendered":"Honey bees tell friend from foe by gut bacteria"},"content":{"rendered":"

Honey bees rely on chemical cues related to their shared gut microbial communities, not genetic relatedness, to identify members of their colony, new research shows.<\/p>\n

For a honey bee, few things are more important than recognizing your nestmates. Being able to tell a nestmate from an invader could mean the difference between a honey-stocked hive and a long, lean winter.<\/p>\n

“Most people only pay attention to the genetics of the actual bee,” says Yehuda Ben-Shahar, professor of biology at Washington University in St. Louis and corresponding author of the new study in 糖心视频 Advances<\/a><\/em>. “What we show is that it is genetic, but it’s the genetics of the bacteria.”<\/p>\n

\"Bees
Guard bees inspect a forager at the entrance to a hive. (Credit: Nathan Beach)<\/figcaption><\/figure>\n

Honey bees recognize and respond to chemical signals from other bees that they detect from skin compounds known as cuticular hydrocarbons, or CHCs. The new study determined that a bee’s particular CHC profile is dependent on its microbiome<\/a>\u2014the bacteria that make up its gut microbial community\u2014and is not something innate or genetic to the bee alone.<\/p>\n

“Different colonies do in fact have colony-specific microbiomes, which has never been shown before,” says first author Cassondra L. Vernier, postdoctoral associate at the University of Illinois, who earned her biology PhD working with Ben-Shahar at Washington University.<\/p>\n

“Bees are constantly sharing food with one another\u2014and exchanging this microbiome just within their colony,” Vernier says.<\/p>\n

“The importance of this paper is that it\u2019s one of the first papers that actually shows that the microbiome is involved in the basic social biology of honey bees\u2014and not just affecting their health,” Vernier says. “The microbiome is involved in how the colony<\/a> as a whole functions, and how they are able to maintain nest defenses, rather than just immune defense within an individual.”<\/p>\n

Bee hive ‘body odor’<\/h3>\n

The gut microbial community\u2014or microbiome\u2014supplies humans and other animals with vitamins, helps digest food, regulates inflammation, and keeps disease-causing microbes in check. Increasingly a topic of research interest, scientists have discovered many ways that the microbiome blurs the borders between a host and its bacteria.<\/p>\n

Research has found that the microbiome influences communication in several different organisms\u2014including, notably, large animals like hyenas.<\/p>\n

For honey bees, the new study shows that the microbiome plays a critical role in defining the tightly regulated chemical signals for group membership.<\/p>\n

Until recently, most scientists thought that honey bees identified nestmates by picking up on a homogenized scent that they recognize from members of their own colony, “a kind of hive BO,” Ben-Shahar jokes.<\/p>\n

Bee colonies are usually composed of highly related individuals. But the chemical signals<\/a> that allow bees to recognize each other are not determined by genetics alone. Researchers know this because baby bees can be placed into other colonies without being rejected\u2014up until a certain age and level of development.<\/p>\n

“It has to be something that they acquire during their lifetimes that defines their nestmate recognition cues,” Vernier says.<\/p>\n

Honey bee microbiome<\/h3>\n

In previous work, Vernier and Ben-Shahar showed that bees develop different scent profiles as they age, and that gatekeeper bees respond differently to foragers returning to the hive compared with younger bees that have never ventured outside.<\/p>\n

That research established a relationship between nestmate recognition and the clearly defined, age-dependent division of labor typical to honey bee hives.<\/p>\n

Only when a bee is old enough to interact with others outside of the hive does it become recognizable to others. That was a clue for the researchers.<\/p>\n

“If you grow a honey bee in isolation, it will never develop a complete microbiome,” Vernier says. “It actually has to acquire most of it from interactions with other bees.”<\/p>\n

\"A
Honey bee on globe thistle. (Credit: Cassondra Vernier)<\/figcaption><\/figure>\n

For this study, researchers determined that forager bees from different honey bee colonies have different gut microbial communities and CHC profiles by sequencing gut samples and analyzing cuticular extracts. The scientists also conducted cross-hive fostering experiments, raising groups of newly hatched bees in either their own colonies or unrelated colonies.<\/p>\n

In the fostering experiments, the researchers found that both source- and host-colony related factors contribute to variations in the overall gut microbial community of individual bees. Of the 14 microbial taxa that significantly differed between treatments, six were similar between bees that shared the same hive environment while they grew up\u2014regardless of actual genetic relatedness.<\/p>\n

The researchers also found that they could manipulate the microbiome of sister bees by feeding different microbes to newly hatched bees. In addition to developing different gut microbial communities, the bees also grew to have different CHC profiles.<\/p>\n

“They were unrecognizable to their siblings,” Vernier says. “Manipulating the microbiome was enough to cause sister bees to develop different scent<\/a> profiles.”<\/p>\n

Honey bee enemies<\/h3>\n

The new work is significant in part because it shows an integral role for the microbiome in the essential, everyday social interactions of honey bees, the Earth’s most important pollinators, the researchers say.<\/p>\n

“For bees, some of the most complex aspects of their social behavior basically depends on bacteria\u2014more than anything else!” Ben-Shahar says.<\/p>\n

“It doesn’t matter how related they are,” he says. “Their ability to say ‘you belong to this group’ basically depends on getting the right bacteria at the right time. Otherwise, they are blind to it.”<\/p>\n

And bee ID is key. The biggest enemy to honey bees is other bees.<\/p>\n

“During fall, when plants stop producing nectar<\/a>, there is a period of time when robbing is very prevalent in colonies,” Vernier says. “Robbing bees will find other colonies, and if they’re able to get in and take some honey, they will go back to their own nests and signal, ‘Hey, go over there. There’s a nest that’s not good at guarding, and we can steal their honey.’<\/p>\n

“Robber bees will take that honey and leave the other colony to starve,” she says. “It’s a very strong pressure.”<\/p>\n

Robbing deprives both the host bees and their associated bacteria with important resources\u2014which may have been the original drive to form this special bacteria-animal partnership, the researchers say.<\/p>\n

Additional coauthors are from the University of Toronto Mississauga and Washington University in St. Louis. The work was conducted in part with bees housed at Tyson Research Center, the environmental field station for Washington University.<\/p>\n

Source: Washington University in St. Louis<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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