Are Gamma Proteobacteria the Predominant Symbionts in the Squid Loligo Pealei?

Barbieri, Elena; Hughes, Deborah; Ericson, Rebecca; Teske, Andreas

doi:10.1007/978-1-4757-5983-9_61

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“…This would account for the layered distribution and the high densities of bacteria between multiple EC layers ( Fig. 2D±F; Pierantoni, 1918;Biggs and Epel, 1991;Barbieri et al, 1998). However, the species composition of the ANG-and the EC-associated bacterial communities is unknown, and it is not clear whether the ANG and the EC harbour the same bacterial populations.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic characterization of epibiotic bacteria in the accessory nidamental gland and egg capsules of the squid Loligo pealei (Cephalopoda: Loliginidae)

Barbieri

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Hughes

et al. 2001

Environmental Microbiology

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Sexually mature female squid Loligo pealei harbour dense bacterial communities in their accessory nidamental glands (ANGs) and in their egg capsules (ECs). This study describes a molecular approach using the 16S rRNA gene (rDNA) to identify bacterial populations within the ANG and the ECs of the North Atlantic squid species L. pealei. Fluorescent in situ hybridization (FISH) and 16S rDNA analysis showed that predominantly alpha- and, to a lesser extent, gamma-proteobacteria were the predominant components of the ANG and EC bacterial communities. Sequencing results showed the presence of alpha-proteobacterial populations affiliated with the Roseobacter group and additional deep-branching alpha-proteobacterial lineages. In contrast, isolates from the ANG and ECs contained only a few alpha-proteobacteria of the Roseobacter group compared with several gamma-proteobacterial isolates, mostly Shewanella and Pseudoalteromonas species. Most of the ANG-associated bacterial populations were also found within the ECs of L. pealei. The molecular approach allowed the visualization of alpha-proteobacteria as major constituents of a bacterial symbiosis within the reproductive system of the Loliginidae.

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Section: Introductionmentioning

confidence: 99%

“…1C and D). Morphologically distinct bacterial populations, which are either rod or coccoid shaped, develop separately from each other in different tubuli compartments of the ANG (Bloodgood, 1977; Barbieri et al ., 1998; Fig. 1E and F).…”

Section: Introductionmentioning

confidence: 99%