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- Publisher
- Springer Journals
- Copyright
- Copyright © 1990 by Springer-Verlag
- Subject
- Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
- ISSN
- 0025-3162
- eISSN
- 1432-1793
- DOI
- 10.1007/BF01319828
- Publisher site
- See Article on Publisher Site
Abstract
227 107 107 2 2 M. B. Saffo Institute of Marine Sciences University of California 95064 Santa Cruz California USA Abstract The marine protist Nephromyces Giard, 1888 is a chronic endosymbiont of molgulid tunicates. Ultrastructural and cytochemical studies of this protist, isolated from molgulid hosts collected from the Pacific, Atlantic and Gulf Coasts of the United States, indicate that Nephromyces is itself chronically infected with Gramnegative, intracellular bacteria. Molgulid tunicates are thus the locus of a nested, tri partite endosymbiosis. Intracellular bacteria are present in both trophic and reproductive stages of Nephromyces, suggesting that the bacterial- Nephromyces symbiosis is an hereditary association. The presence of endosymbionts in Nephromyces raises the possibility that some of Nephromyces' metabolic characteristics, in particular its high urate oxidase activity, might be supplied not by Nephromyces itself, but rather by its intracellular bacteria, possibly functioning as peroxisomal analogues.
Journal
Marine Biology – Springer Journals
Published: Jun 1, 1990