Cooperative hydrodynamics accompany multicellular-like colonial organization in the unicellular ciliate Stentor

• Type of Material: Article
• Authors: Shashank Shekhar, Emory University; Hanliang Guo, Ohio Wesleyan University; Sean P Colin, Whitman Center, Marine Biological Laboratory, Woods Hole; Wallace Marshall, University of California San Francisco; Eva Kanso, University of Southern California; John H Costello, Whitman Center, Marine Biological Laboratory, Woods Hole
• Language: English
• Date: 2023-01-12
• Publisher: NIH
• Publication Version: Preprint (Prior to Peer Review)
• Copyright Statement: The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.
• License: Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International
• Final Published Version (URL): http://dx.doi.org/10.1101/2023.01.10.523506
• Title of Journal or Parent Work: bioRxiv
• Volume: 2023
• Keywords: Evolution
• Research Categories: Mathematics

Abstract

Evolution of multicellularity from early unicellular ancestors is arguably one of the most important transitions since the origin of life1,2. Multicellularity is often associated with higher nutrient uptake3, better defense against predation, cell specialization and better division of labor4. While many single-celled organisms exhibit both solitary and colonial existence3,5,6, the organizing principles governing the transition and the benefits endowed are less clear. Using the suspension-feeding unicellular protist Stentor coeruleus, we show that hydrodynamic coupling between proximal neighbors results in faster feeding flows that depend on the separation between individuals. Moreover, we find that the accrued benefits in feeding current enhancement are typically asymmetric– individuals with slower solitary currents gain more from partnering than those with faster currents. We find that colony-formation is ephemeral in Stentor and individuals in colonies are highly dynamic unlike other colony-forming organisms like Volvox carteri 3. Our results demonstrate benefits endowed by the colonial organization in a simple unicellular organism and can potentially provide fundamental insights into the selective forces favoring early evolution of multicellular organization.