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
  • Arts and Sciences Hosts Inaugural Scholarship and Research Gala
    Friday, May 9, 2025, By Sean Grogan
  • Chancellor Kent Syverud Honored as Distinguished Citizen of the Year at 57th Annual ScoutPower Event
    Thursday, May 8, 2025, By News Staff
  • New Maymester Program Allows Student-Athletes to Develop ‘Democracy Playbook’
    Thursday, May 8, 2025, By Wendy S. Loughlin
  • From Policy to Practice: How AI is Shaping the Future of Education
    Thursday, May 8, 2025, By Christopher Munoz
  • Kohn, Wiklund, Wilmoth Named Distinguished Professors
    Thursday, May 8, 2025, By Wendy S. Loughlin

More In STEM

Chloe Britton Naime Committed to Advocating for Improved Outcomes for Neurodivergent Individuals

Chloe Britton Naime ’25 is about to complete a challenging and rare dual major program in both mechanical engineering from the College of Engineering and Computer Science and neuroscience from the College of Arts and Sciences. Even more impressive? Britton…

Graduating Research Quartet Synthesizes Long-Lasting Friendships Through Chemistry

When Jesse Buck ’25, Isabella Chavez Miranda ’25, Lucy Olcott ’25 and Morgan Opp ’25 started as student researchers in medicinal chemist Robert Doyle’s lab, they hoped to hone their research skills. It quickly became evident this would be unlike…

Biologist Reveals New Insights Into Fish’s Unique Attachment Mechanism

On a wave-battered rock in the Northern Pacific Ocean, a fish called the sculpin grips the surface firmly to maintain stability in its harsh environment. Unlike sea urchins, which use their glue-secreting tube feet to adhere to their surroundings, sculpins…

Distinguished ECS Professor Pramod K. Varshney Establishes Endowed Faculty Fellowship

Distinguished Professor Pramod K. Varshney has exemplified Orange excellence since joining the University as a 23-year-old faculty member. A world-renowned researcher and educator, he’s been recognized for his seminal contributions to information fusion and related fields, introducing new, innovative courses…

Earth Day Spotlight: The Science Behind Heat Pumps (Video)

Peter Wirth has a two-fold strategy when it comes to renovating his home. The Brooklyn, New York, native has called Central New York home for more than 40 years. Nestled on a quiet cul-de-sac in Fayetteville, New York, the 1960s-era…

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.