Phylogenetic diversity of epibiotic bacteria in the accessory nidamental glands of squids (Cephalopoda: Loliginidae and Idiosepiidae) |
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Authors: | Email author" target="_blank">Delphine?PichonEmail author Valeria?Gaia Mark?D?Norman Renata?Boucher-Rodoni |
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Institution: | (1) Département Milieux et Peuplements aquatiques (MNHN), Biologie des Organismes marins et Ecosystème (UMR5178, CNRS), 55 rue Buffon, 75005 Paris, France;(2) Cantonal Institute of Microbiology, University of Geneva, 6500 Bellinzona, Switzerland;(3) Museum Victoria, GPO Box 666E, Melbourne, 3001, VIC, Australia |
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Abstract: | Bacterial communities were identified from the accessory nidamental glands (ANGs) of European and Western Pacific squids of
the families Loliginidae and Idiosepiidae, as also in the egg capsules, embryo and yolk of two loliginid squid species, and
in the entire egg of one idiosepiid squid species. The results of phylogenetic analyses of 16S RNA gene (rDNA) confirmed that
several phylotypes of α-proteobacteria, γ-proteobacteria and Cytophaga–Flavobacteria–Bacteroides phylum were present as potential symbiotic associations within the ANGs. Several identified clones were related to reference
strains, while others had no known close relatives. Gram positive strains were rare in loliginid squids. Several bacterial
groups may play important roles in the function of the ANGs, such as production of the toxic compounds involved in egg protection
and carotenoid pigments. Within the eggs, no bacteria were associated with embryo or yolk of Loligo vulgaris and Sepioteuthis lessoniana, but α- and γ-proteobacteria were present in the egg capsules. Most bacterial strains detected in the egg capsules were the
same as those found in the ANGs. The cephalopods of temperate regions (European cuttlefishes and the squid L. vulgaris) appear to be associated with one Agrobacterium strain (Agro2) while tropical-subtropical strains (Asian and Australian loliginids) are associated with Silicibacter-related strains, suggesting a biogeographic clustering for the Agrobacterium-like strains. |
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