Project 3616: A. Ziegler, A. M. Gilligan, J. G. Dillon, B. Pernet. 2020. Schizasterid heart urchins host microorganisms in a digestive symbiosis of Mesozoic origin. Frontiers in Microbiology. 11:1697.
Specimen: Brisaster townsendi (A. Agassiz, 1898) (unvouchered)
View: Aboral

Abstract

Because of their lifestyles, abundance, and feeding habits, infaunal marine deposit feeders have a significant impact on the ocean floor. As these animals also ingest microorganisms associated with their sediment and seawater diet, their digestive tract usually contains a diverse array of bacteria. However, while most of these microorganisms are transients, some may become part of a resident gut microbiome, in particular when sheltered from the main flow of digesta in specialized gut compartments. Here, we provide an in-depth analysis of the structure and contents of the intestinal caecum (IC), a hindgut diverticulum found exclusively in schizasterid heart urchins (Echinoidea: Spatangoida: Schizasteridae). Based on specimens of Brisaster townsendi, in addition to various other schizasterid taxa, our structural characterization of the IC shows that the organ is a highly specialized gut compartment with unique structural properties. Next generation sequencing shows that the IC contains a microbial population composed predominantly of Bacteroidales, Desulfobacterales, and Spirochaetales. The microbiome of this gut compartment is significantly different in composition and lower in diversity than the microbial population in the sedimentfilled main digestive tract. Inferences on the function and evolution of the IC and its microbiome suggest that this symbiosis plays a distinct role in host nutrition and that it evolved at least 66 million years ago during the final phase of the Mesozoic.


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Article DOI: 10.3389/fmicb.2020.01697

Project DOI: 10.7934/P3616, http://dx.doi.org/10.7934/P3616
This project contains
  • 45 Media
  • 17 Taxa
  • 50 Specimens
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MorphoBank Project 3616
  • Creation Date:
    16 January 2020
  • Publication Date:
    21 July 2020
  • Project views: 18880

    This research
    supported by

    Authors' Institutions

    • California State University Long Beach

    • Rheinische Friedrich-Wilhelms-Universit├Ąt Bonn (University of Bonn)



    Members

    member name taxa specimens media media
    notes
    Alexander Ziegler
    Project Administrator
    17504545
    Jesse G. Dillon
    Full membership
    0000
    Ariel M. Gilligan
    Full membership
    0000
    Bruno Pernet
    Full membership
    0000


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