Developmental trajectories and breakdown in F1 interpopulation hybrids ofTribolium castaneum
| Autor: | Michael J. Wade, Ross C. Ehmke, Victoria Jideonwo, Douglas W. Drury |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
Flour beetle media_common.quotation_subject Hybrid inviability Development 010603 evolutionary biology 01 natural sciences 03 medical and health sciences hybridization Ecology Evolution Behavior and Systematics Original Research 030304 developmental biology Nature and Landscape Conservation media_common Hybrid Local adaptation Genetics Tribolium 0303 health sciences Larva Ecology biology fungi biology.organism_classification Phenotype Speciation speciation Instar |
| Zdroj: | Ecology and Evolution |
| ISSN: | 2045-7758 |
| DOI: | 10.1002/ece3.536 |
| Popis: | When hybrid inviability is an indirect by-product of local adaptation, we expect its degree of severity between pairs of populations to vary and to be sensitive to the environment. While complete reciprocal hybrid inviability is the outcome of the gradual process of local adaptation, it is not representative of the process of accumulation of incompatibility. In the flour beetle, Tribolium castaneum, some pairs of populations exhibit complete, reciprocal F1 hybrid incompatibility while other pairs are fully or partially compatible. We characterize this naturally occurring variation in the degree and timing of expression of the hybrid incompatible phenotype to better understand the number of genes or developmental processes contributing to speciation. We assessed the morphological and developmental variation in four Tribolium castaneum populations and their 12 possible F1 hybrids at each life-history stage from egg to adult. We find that the rate of hybrid larval development is affected in all interpopulation crosses, including those eventually producing viable, fertile adults. Hybrid incompatibility manifests early in development as changes in the duration of instars and diminished success in the transition between instars are relative to the parent populations. Parent populations with similar developmental profiles may produce hybrids with disrupted development. The degree and timing of expression of hybrid inviability depends upon populations crossed, direction of the cross, and environment in which hybrids are raised. Our findings suggest that the coordinated expression of genes involved in transitional periods of development is the underlying cause of hybrid incompatibility in this species. |
| Databáze: | OpenAIRE |
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