Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 23, Issue 2, Pages 171-188Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S1055-7903(02)00013-1
Keywords
12S; CO1; Dryocoetini; EF-1 alpha; maximum-likelihood; maximum-parsimony; morphology; RASA; Scolytinae; seed feeding; specialization
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Regular inbreeding by sib-mating is one of the most successful ecological strategies in the bark beetle family Scolytinae. Within this family, the many species (119) in Coccotrypes are found breeding in an exceptional variety of untraditional woody tissues different from bark and phloem. Species delineation by morphological criteria is extremely difficult, however, as in most other inbreeding groups of beetles, perhaps due to the unusual evolutionary dynamics characterizing sib-mating organisms. Hence, we here performed a phylogenetic analysis using molecular data in conjunction with morphological data to better understand morphological and ecological evolution in this sib-mating group. We used partial DNA sequences from the nuclear gene EF-alpha and the mitochondrial genes 12S and CO1 to elucidate patterns of morphological evolution, haplotype variation, and evolutionary pathways in resource use. Sequence variation was high among species and far above that expected at the species level (e.g., 19% for CO1 within Coccotrypes advena). The tendency for exhaustive sequence variation at deeper nodes resulted in ambiguous reconstructions of the deepest splits. However, all results suggested that species with the broadest diets were clustered in a single derived position-another piece of evidence against specialization as a derived evolutionary feature. (C) 2002 Elsevier Science (USA). All rights reserved.
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