Titel
Ultrastructural evidence for nutritional relationships between a marine colonial invertebrate (Bryozoa) and its bacterial symbionts
Autor*in
N. P. Karagodina
Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University
A. E. Vishnyakov
Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University
O. N. Kotenko
Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University
... show all
Abstract
Autozooids of the cheilostome bryozoan Aquiloniella scabra contain rod-like bacteria in the funicular bodies – the complex swellings of the funicular strands. Each funicular body contains symbionts in the central cavity surrounded by a large, synthetically active internal “sheath-cell” (bacteriocyte) and a group of the flat external cells. The tightly interdigitating lobes of these cells form a capsule well-isolated from the body cavity. Slit-like spaces between bacteria are filled with electron-dense matrix and cytoplasmic processes of various sizes and shapes (often branching) produced by the “sheath-cell”. The cell ultrastructure and complex construction of the funicular bodies as well as multiplication of the bacteria in them suggest metabolic exchange between host and symbiont, involving the nourishment of bacteria. We suggest that the bacteria, in turn, influence the bryozoan mesothelial tissue to form the funicular bodies as capsules for bacterial incubation. We present ultrastructural data, discuss possible variants in the development of the funicular bodies in Bryozoa, and propose the possible role of bacteria in the life of their bryozoan host.
Stichwort
BryozoaBacteriaSymbiosisUltrastructureNourishment
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
Symbiosis
Publication
Springer Nature
Erscheinungsdatum
2017
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2017
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