We’ve updated our Privacy Policy to make it clearer how we use your personal data.

News Oct 21, 2020
| Original story from the University of California, Davis

A wild honeybee in Davis, California. European honeybees (Apis mellifera) were introduced to the Americas in the 1600s. Since 1957, “Africanizedhoneybees (Apis mellifera scutellata) have interbred with other honeybees. New genomics research shows that climate forms a barrier to the spread of these scutellata genes to the north and south. Credit: Erin Calfee.

Since the 1950s, “Africanized” honeybees have spread north and south across the Americas until apparently coming to a halt in California and northern Argentina. Now genome sequencing of hundreds of bees from the northern and southern limits shows a gradual decline in African ancestry across hundreds of miles, rather than an abrupt shift.“There’s a gradual transition at the same latitude in North and South America,” said Erin Calfee, graduate student in the Department of Evolution and Ecology at the University of California, Davis, and first author on the paper, published Oct. 19 in PLOS Genetics. “There’s a natural barrier that is likely maintained by many different genetic loci.”That barrier is mostly likely climate. Bees with majority African ancestry are unable to survive colder winters.European colonists brought European species of honeybees (Apis mellifera) with them to the Americas as early as the 1600s. In addition to apiaries, these bees established in the wild alongside native bees.In 1957, imported African honeybees of the subspecies Apis mellifera scutellata swarmed out of experimental hives in Brazil and started to rapidly spread, interbreeding with the resident European bees. Native to southern and eastern Africa, scutellata bees are known for their defensive behavior. They also carry some useful traits for beekeepers, such as resistance to Varroa mites.Calfee, working with Professor Graham Coop and Associate Professor Santiago Ramirez from the Department of Evolution and Ecology and collaborators in Argentina, sequenced the genomes of bees collected at the northern and southern edges of the scutellata expansion.They found that the bees at the northern and southern edges of the range have a highly variable mix of scutellata and European bee ancestry. The higher the latitude, the less scutellata ancestry is in the mix.“The whole genome is tracking latitude and climate,” Calfee said. There are likely many genes involved in climate sensitivity and winter survival, she said. But Calfee also finds that in some parts of the genome scutellata ancestry has spread far beyond these climate limits in both North and South America, evidence that some scutellata genes are advantageous and not tied to climate sensitivity. In contrast, the researchers did not find any evidence for selection for European ancestry in the spread of scutellata bees.The findings challenge the idea of a binary difference between “Africanized” and “European” honeybees, Ramirez said. In fact, all of these introduced honeybees are hybrids to some degree.Diversity a resource for breeding beesThe results of the study could be of interest for breeding bees for desirable traits, such as resistance to pathogens. Although the researchers looked only at gene sequences and not the resulting phenotypes (except for one, wing length), the results do show which genetic loci are important because they are under selection in the hybrid zones.Scutellata bees and hybrids have a lot more genetic diversity than European bees, and the researchers found that they lost very little of this diversity in their expansion from Brazil to California.“Beekeepers can potentially draw from this genetic variation to breed for desirable traits,” Ramirez said. What started out as an invasion may become part of the solution to declining bee health.“It makes sense but it’s kind of surprising because we have 1.5 million (honeybee) colonies being brought into California every spring to pollinate crops,” Ramirez said. Those domesticated bees are then trucked around the country, but they do not appear to have a large effect on the spread of African ancestry into feral honeybee populations.Reference: Calfee E, Agra MN, Palacio MA, Ramírez SR, Coop G. Selection and hybridization shaped the rapid spread of African honey bee ancestry in the Americas. PLOS Genetics. 2020;16(10):e1009038. doi:10.1371/journal.pgen.1009038.This article has been republished from the following materials. Note: material may have been edited for length and content. For further information, please contact the cited source.

Study Reveals Potential Gene Behind “Glowing” of Sea Pickle

A new study describes a bioluminescent gene that could be the reason that so-calledsea pickles,” or pyrosomes, an underwater free-floating colony of thousands of tiny animals, reverberate in blue-green light.

“Safe” PFAS Intake Values Put Forward

The EFSA has derived a tolerable weekly intake of four PFAS, namely PFOA, PFOS, perfluorohexane sulfonic acid (PFHxS) and perfluorononanoic acid (PFNA) of 4.4 nanograms (ng) per kilogram (kg) of body weight per week. This value indicates the amount of a substance that can be ingested weekly over a lifetime with no appreciable health risk.

Breakthrough Shows Neuropilin-1 Drives SARS-CoV-2 Infectivity

In a major breakthrough scientists have potentially identified what makes SARS-CoV-2 highly infectious and able to spread rapidly in human cells. The findings describe how the virus’s ability to infect human cells can be reduced by inhibitors that block a newly discovered interaction between virus and host, demonstrating a potential anti-viral treatment.

Like what you just read? You can find similar content on the communities below.

To personalize the content you see on Technology Networks homepage, Log In or Subscribe for Free

Source: https://www.technologynetworks.com/tn/news/climate-is-a-likely-barrier-to-the-spread-of-africanized-bees-341890

Africanized bee, Western honey bee, African bee, Genome, Genomics

World news – GB – Climate Is a Likely Barrier to the Spread of Africanized Bees

Building on its expertise in the areas of digital, technologies and processes , CSS Engineering you in your most ambitious transformation projects and helps you bring out new ideas, new offers, new modes of collaboration, new ways of producing and selling.

CSS Engineering is involved in projects each customer as if it were his own. We believe a consulting company should be more than an advisor. We put ourselves in the place of our customers, to align we incentives to their goals, and collaborate to unlock the full potential their business. This establishes deep relationships and enjoyable.

Our services:

  1. Create professional websites
  2. Hosting high performance and unlimited
  3. Sale and video surveillance cameras installation
  4. Sale and Installation of security system and alarm
  5. E-Marketing

All our achievements here https://www.css-engineering.com/en/works/

LEAVE A REPLY

Please enter your comment!
Please enter your name here