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A likelihood-based comparison of population histories in a parasitoid guild

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)4605-4617
Number of pages13
JournalMolecular Ecology
Volume21
Issue number18
DOIs
Publication statusPublished - Sep 2012

Abstract

Little is known about the stability of trophic relationships in complex natural communities over evolutionary timescales. Here, we use sequence data from 18 nuclear loci to reconstruct and compare the intraspecific histories of major Pleistocene refugial populations in the Middle East, the Balkans and Iberia in a guild of four Chalcid parasitoids (Cecidostiba fungosa, Cecidostiba semifascia, Hobbya stenonota and Mesopolobus amaenus) all attacking Cynipid oak galls. We develop a likelihood method to numerically estimate models of divergence between three populations from multilocus data. We investigate the power of this framework on simulated data, andusing triplet alignments of intronic lociquantify the support for all possible divergence relationships between refugial populations in the four parasitoids. Although an East to West order of population divergence has highest support in all but one species, we cannot rule out alternative population tree topologies. Comparing the estimated times of population splits between species, we find that one species, M.similar to amaenus, has a significantly older history than the rest of the guild and must have arrived in central Europe at least one glacial cycle prior to other guild members. This suggests that although all four species may share a common origin in the East, they expanded westwards into Europe at different times.

    Research areas

  • community assembly, comparative phylogeography, maximum likelihood, population divergence

ID: 6156983