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Preferential host switching and codivergence shaped radiation of bark beetle symbionts, nematodes of M icoletzkya ( N ematoda: D iplogastridae)
Author(s) -
Susoy V.,
Herrmann M.
Publication year - 2014
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1111/jeb.12367
Subject(s) - biology , adaptive radiation , host (biology) , adaptation (eye) , phylogenetic tree , ecology , context (archaeology) , evolutionary biology , coevolution , phylogenetics , insect , zoology , gene , genetics , paleontology , neuroscience
Host‐symbiont systems are of particular interest to evolutionary biology because they allow testable inferences of diversification processes while also providing both a historical basis and an ecological context for studies of adaptation. Our investigations of bark beetle symbionts, predatory nematodes of the genus M icoletzkya, have revealed remarkable diversity of the group along with a high level of host specificity. Cophylogenetic analyses suggest that evolution of the nematodes was largely influenced by the evolutionary history of beetles. The diversification of the symbionts, however, could not be attributed to parallel divergence alone; our results indicate that adaptive radiation of the nematodes was shaped by preferential host shifts among closely related beetles along with codivergence. Whereas ecological and geographic isolation have played a major role in the diversification of M icoletzkya at shallow phylogenetic depths, adaptations towards related hosts have played a role in shaping cophylogenetic structure at a larger evolutionary scale.