期刊
EVOLUTION
卷 66, 期 9, 页码 2798-2814出版社
WILEY
DOI: 10.1111/j.1558-5646.2012.01643.x
关键词
Adaptive radiation; Delphacidae; Hemiptera; landscape genetics; molecular clock; population genetics; reproductive isolation; speciation
资金
- University of California
- U. C. Pacific Rim Research Program
- Margaret C. Walker Fund for Systematic Entomology
- Souja Memorial Fund
- Steinhaus Memorial Fund
- Sigma Xi
Adaptive radiation involves ecological shifts coupled with isolation of gene pools. However, we know little about what drives the initial stages of divergence. We study a system in which ecological diversification is found within a chronologically well-defined geological matrix to provide insight into this enigmatic phase of radiation. We tested the hypothesis that a period of geographic isolation precedes ecological specialization in an adaptive radiation of host-specialized Hawaiian planthoppers. We examined population structure and history using mitochondrial and multiple independent microsatellite loci in a species whose geographic distribution on the island of Hawaii enabled us to observe the chronology of divergence in its very earliest stages. We found that genetic divergence is associated with geographic features but not different plant hosts and that divergence times are very recent and on the same timescales as the dynamic geology of the island. Our results suggest an important role for geography in the dynamics of the early stages of divergence.
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