Skip to main content
  • Home
  • About
  • Faculty Experts
  • For The Media
  • ’Cuse Conversations Podcast
  • Topics
    • Alumni
    • Events
    • Faculty
    • Students
    • All Topics
  • Contact
  • Submit
STEM
  • All News
  • Arts & Culture
  • Business & Economy
  • Campus & Community
  • Health & Society
  • Media, Law & Policy
  • STEM
  • Veterans
  • University Statements
  • Syracuse University Impact
  • |
  • The Peel
  • Athletics
Sections
  • All News
  • Arts & Culture
  • Business & Economy
  • Campus & Community
  • Health & Society
  • Media, Law & Policy
  • STEM
  • Veterans
  • University Statements
  • Syracuse University Impact
  • |
  • The Peel
  • Athletics
  • Home
  • About
  • Faculty Experts
  • For The Media
  • ’Cuse Conversations Podcast
  • Topics
    • Alumni
    • Events
    • Faculty
    • Students
    • All Topics
  • Contact
  • Submit
STEM

Syracuse Biologists Publish Research on the Persistence of Mutualisms in ‘Science’

Monday, November 2, 2020, By Dan Bernardi
Share
College of Arts and SciencesDepartment of BiologyResearch and Creative
researcher with a tray containing a harvested community of yeast

Postdoctoral researcher Mayra Vidal with a tray containing a harvested community of yeast.

The sign of a healthy personal relationship is one that is equally mutual—where you get out just as much as you put in. Nature has its own version of a healthy relationship. Known as mutualisms, they are interactions between species that are mutually beneficial for each species.

One example is the interaction between plants and pollinators, where your apple trees are pollinated and the honeybee gets nectar as a food reward. But what makes these mutualisms persist in nature? If rewards like nectar are offered freely, does this make mutualisms more susceptible to other organisms that take those rewards without providing a service in return?

A team of researchers from the College of Arts and Sciences (A&S), including co-principal investigators Kari Segraves, professor of biology, and David Althoff, associate professor of biology, along with postdoctoral researcher Mayra Vidal, former research assistant professor David Rivers and Sheng Wang G’20, recently researched that question and the results were published in the Oct. 16 edition of the prestigious journal “Science.”

They investigated the abilities of simple versus diverse communities of mutualists, comparing how each deal with cheaters. Cheaters are species that steal the benefits of the mutualism without providing anything in return. An example of one of nature’s cheaters is nectar robbers. Nectar-robbing bees chew through the side of flowers to feed on nectar without coming into contact with the flower parts that would result in pollination.

The research team wanted to test if having multiple mutualists with similar roles allows the community as a whole to persist when cheaters take away the mutualists’ resources. The idea was to examine whether having more species involved in a mutualism, such as many pollinator species interacting with many different plant species, made the mutualism less susceptible to the negative effects of cheaters. They also wanted to analyze whether increasing the number of mutualist species allowed all the mutualists to persist or if competition would whittle down the number of mutualist species over time. In essence, the team wanted to understand the forces governing large networks of mutualists that occur in nature.

pairwise communities with cheater; complex communities with cheater

Wells of yeast in the top tray with only two mutualist species and a cheater showed higher extinction (indicated by the many dark wells). Yeast strains of complex communities and a cheater in the bottom tray showed better growth and less extinction.

A&S researchers tested their ideas by producing mutualisms in the lab using yeast strains that function as mutualistic species. These strains were genetically engineered to trade essential food resources. Each strain produced a food resource to exchange with a mutualist partner. They engineered four species of each type of mutualist as well as two cheater strains that were unable to make food resources.

The researchers assembled communities of yeast that differed both in the number of species and the presence of cheaters. They found that communities with higher numbers of mutualist species were better able to withstand the negative effects of cheaters because there were multiple species of mutualists performing the same task. If one species was lost from the community due to competing with a cheater, there were other species around to perform the task, showing that the presence of more species in a community can lessen the negative effects of cheaters.

“It’s similar to thinking about a plant that has many pollinator species,” says Segraves. “If one pollinator species is lost, there are other pollinator species around to pollinate. If a plant only has one species of pollinator that goes extinct, the mutualism breaks down and might cause extinction of the plant.”

Their results highlight the importance of having multiple mutualist species that provide similar resources or services, essentially creating a backup in case one species goes extinct. Segraves compares this phenomenon to the relationship between retailers and consumers. Communities typically have multiple banks, grocery stores, restaurants and hospitals to ensure that there are always goods and services available should something happen to one company or facility, or, as with COVID-19 today, grocery stores now have multiple suppliers to fend off shortages.

Segraves says future research will explore the possibility of a mutualist species becoming a cheater. The group is testing if mutualists that perform the same function might set up an environment that allows one of those mutualist species to become a cheater since there are other mutualists around that can fill that role. They predict that the mutualist species that is experiencing the most competition from the other mutualists will be the species that switches to cheating. They also hope to determine how the mutualists and cheaters evolved over time to provide a deeper understanding of the actual changes that led to differing outcomes in the communities.

The team’s research was funded by a $710,000, three-year grant from the National Science Foundation.

  • Author

Dan Bernardi

  • Recent
  • Lights, Camera, Imagination! Faculty Help Turn Teens’ Ideas Into Films (Video)
    Thursday, July 31, 2025, By Diane Stirling
  • Bowlers Wanted for Faculty and Staff Bowling League
    Thursday, July 31, 2025, By News Staff
  • Lender Center New York Event Gathers Wealth Gap Experts
    Wednesday, July 30, 2025, By Diane Stirling
  • After Tragedy, Newhouse Grad Rediscovers Her Voice Through Podcasting
    Wednesday, July 30, 2025, By Chris Velardi
  • Back-to-School Shopping: More Expensive and Less Variety of Back-to-School Items
    Tuesday, July 29, 2025, By Daryl Lovell

More In STEM

New Study Reveals Ozone’s Hidden Toll on America’s Trees

A new nationwide study reveals that ozone pollution—an invisible threat in the air—may be quietly reducing the survival chances of many tree species across the United States. The research, published in the Journal of Geophysical Research: Atmospheres is the first…

Inspiring the Next Generation of STEM Enthusiasts

A friendly competition is brewing in the corner of a basement classroom in Link Hall during the annual STEM Trekkers summer program, where students are participating in a time-honored ritual: seeing who can build a paper airplane that travels the…

5 Surprisingly Simple Ways to Use Generative Artificial Intelligence at Work

Not too long ago, generative artificial intelligence (AI) might’ve sounded like something out of a sci-fi movie. Now it’s here, and it’s ready to help you write emails, schedule meetings and even create presentations. In a recent Information Technology Services…

NSF I-Corps Semiconductor and Microelectronics Free Virtual Course Being Offered

University researchers with groundbreaking ideas in semiconductors, microelectronics or advanced materials are invited to apply for an entrepreneurship-focused hybrid course offered through the National Science Foundation (NSF) Innovation Corps (I-Corps) program. The free virtual course runs from Sept. 15 through…

Jianshun ‘Jensen’ Zhang Named Interim Department Chair of Mechanical and Aerospace Engineering

The College of Engineering and Computer Science (ECS) is excited to announce that Professor Jianshun “Jensen” Zhang has been appointed interim department chair of mechanical and aerospace engineering (MAE), as of July 1, 2025. Zhang serves as executive director of…

Subscribe to SU Today

If you need help with your subscription, contact sunews@syr.edu.

Connect With Us

  • X
  • Facebook
  • Instagram
  • Youtube
  • LinkedIn
Social Media Directory

For the Media

Find an Expert Follow @SyracuseUNews
  • Facebook
  • Instagram
  • Youtube
  • LinkedIn
  • @SyracuseU
  • @SyracuseUNews
  • Social Media Directory
  • Accessibility
  • Privacy
  • Campus Status
  • Syracuse.edu
© 2025 Syracuse University News. All Rights Reserved.