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Fig. 7 | BMC Evolutionary Biology

Fig. 7

From: Fitness costs of symbiont switching using entomopathogenic nematodes as a model

Fig. 7

Evolutionary relatedness between Steinernema nematodes and their native symbionts and the fitness consequence of host-symbiont switching events. A. Co-phylogeny tanglegram of Steinernema-Xenorhabdus pairs used in experiments. The Steinernema phylogeny was generated with concatenated 12S and 28S rRNA genes (see Table 1 for accession IDs), while the Xenorhabdus phylogeny shows the results from a concatenation of the following genes: 16S rRNA, recA, dnaN, gltX, gyrB, and infB (see Additional file 1: Table S1 for gene labels and Table 1 for genome accession IDs). Internal nodes indicate bootstrap replicate values >50%. Panels B and C show relative nematode and bacterial fitness, respectively, by bacterial phylogenetic distance from native Steinernema-Xenorhabdus pairing. For both graphs, data points indicate mean and SE from a linear regression analysis; see Additional file 1: Table S4 for model summary. S. intermedium = black triangles with black line, S. oregonense = gray squares with gray line, and S. puntauvense = hashed diamonds with dashed line

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