Fig. 1
From: Fidelity varies in the symbiosis between a gutless marine worm and its microbial consortium
The O. algarvensis population in two bays off the island of Elba was dominated by two mitochondrial haplotypes. a Light microscopy image of Olavius algarvensis. b Fluorescence in situ hybridization image of an O. algarvensis cross section, highlighting the symbionts just below the cuticle of the host (gammaproteobacterial symbionts in green and deltaproteobacterial symbionts in red, using general probes for these two phyla). Reproduced with permission from Kleiner et al. [67]. c and d Location of the two collection sites, Sant’ Andrea and Cavoli, two bays off the island of Elba in the Mediterranean. e Haplotype network of mitochondrial cytochrome c oxidase subunit 1 (COI) gene sequences of O. algarvensis individuals from the two collection sites. The two dominant COI haplotypes A and B co-occurred in both bays. The size of the pie charts corresponds to COI haplotype frequencies. Hatch marks correspond to the number of point mutations between COI haplotypes. Nodes depicted by small red points indicate unobserved intermediates predicted by the algorithm in the haplotype network software. The number of individuals identified as COI haplotype A or B in each bay is in parentheses in the box below the network.