期刊
JOURNAL OF HEREDITY
卷 103, 期 1, 页码 103-114出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esr109
关键词
heterosis; hybridization; outbreeding depression; postzygotic reproductive isolation; thermal adaptation
资金
- National Science Foundation [DEB-0516139, DEB-0821003]
- University of North Carolina, Chapel Hill
- Division Of Environmental Biology
- Direct For Biological Sciences [0821003] Funding Source: National Science Foundation
The outcome of hybridization can be impacted by environmental conditions, which themselves can contribute to reproductive isolation between taxa. In crosses of genetically divergent populations, hybridization can have both negative and positive impacts on fitness, the balance between which might be tipped by changes in the environment. Genetically divergent populations of the intertidal copepod Tigriopus californicus have been shown to differ in thermal tolerance at high temperatures along a latitudinal gradient. In this study, a series of crosses were made between pairs of genetically divergent populations of T. californicus, and the thermal tolerance of these hybrids was tested. In most cases, the first-generation hybrids had relatively high thermal tolerance and the second-generation hybrids were not generally reduced below the less-tolerant parental population for high temperature tolerance. This pattern contrasts with previous studies from crosses of genetically divergent populations of this copepod, which often shows hybrid breakdown in these second-generation hybrids for other measures of fitness. These results suggest that high temperature stress could either increase the positive impacts of hybridization or decrease the negative impacts of hybridization resulting in lowered hybrid breakdown in these population crosses.
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