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Microbial symbiosis in Annelida
BRIGHT Monika ; GIERE Olav
Among Annelida various taxa have independently established symbioses with numerous phylotypes of bacteria, the most renowned symbiosis being that of the giant tube worms around hydrothermal vents. Taxonomically, the symbiotic associations range on the host side from a few genera within else aposymbiotic groups (Tubificidae in the Oligochaeta or Glossiphoniidae in the Hirudinea) to higher taxa with all their species living in symbiosis (Siboglinidae, Alvinellidae in the Polychaeta). The ties between partners range from rather loose and occasional associations (some mud-dwelling tubificids) over regular ectosymbiosis (Alvinellids) to obligatory extra- or intracellular incorporation into the body (gutless oligochaetes, glossiphoniid leeches, siboglinid tube worms). Occurring from eulittoral beaches to deep-sea hot vents, from rotting wood at the sea bottom to freshwater ponds, the associations with bacteria seem to have adaptive significance in a broad ecological and nutritional range. In the sea, chemoautotrophy in sulfidic, otherwise hostile environments is a major factor driving the symbioses, but trophic specializations such as digestion of wood or blood also seem to favor a coordinated and mutually beneficial association with bacteria. While most annelid hosts harbor just one bacterial phylotype, the symbioses in the rich species flock of bacteria-symbiotic gutless oligochaetes (Olavius and Inanidrilus) are dual or even multiple. Most sulfide oxidizing bacterial symbionts b
Balaban; Balaban
ISSN : 0334-5114 CODEN : SYMBER
Symbiosis (Philadelphia, PA) A. 2005, vol. 38, n° 1, pp. 1-45 [45 pages] [bibl. : 10 p.1/2]
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