Niche divergence of Abies grandis–Abies concolor hybrids (original) (raw)
Abstract
Homoploid hybridization has increasingly been recognized as an important source of genetic variation to support adaptation to changing environmental conditions, the invasion of novel ecological niches and, ultimately, speciation. Although ecological selection pressures have been theorized to play a key role in the stabilization of homoploid hybrid lineages, surprisingly few detailed quantitative studies compare the realized ecological niches of hybrids and their progenitors. In this study, we compare twenty bioclimatic variables (Worldclim) at representative occurrence sites of Abies grandis, Abies concolor, and two classes of their natural hybrids, which are variably intergradient between their progenitors, to assess the potential role of ecological selection in the evolution of the observed morphological patterns of introgression. We find that both hybrid classes occupy distinct habitats that are variably intermediate between those associated with A. grandis and A. concolor for a majority of environmental variables, but with lower precipitation in the summertime in the southern Cascade, Siskiyou, and Sierra Nevada Mountains than associated with either progenitor. We hypothesize that moisture stress and high levels of solar insolation in the summertime associated with hybrid populations have played an important role in the observed patterns of introgression of key traits: leaf angle, specific leaf area, and abundance of adaxial stomates. Phenotypic plasticity in two of these traits may allow hybrids to adapt to an environment with a higher degree of variability in moisture stress. Moreover, in the context of moisture stress associated with predicted climate change, hybrids may have an adaptive advantage over A. grandis.
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Acknowledgments
We thank Dr. Steven Brunsfeld and Dr. Fred Johnson for insightful ideas long before spatial analysis and landscape scale niche modeling was technically possible; without their inspiration, this manuscript would not have been completed. This entire manuscript rests on their astute observations and profound understanding of intricate ecological and evolutionary patterns that characterize this complex. We thank Dr. John Marshall, Dr. George Newcombe, and anonymous reviewers for valuable comments that contributed to the quality of this manuscript.
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Authors and Affiliations
- Department of Fish and Wildlife Sciences, University of Idaho, Moscow, ID, 83844, USA
Todd M. Ott & Cort L. Anderson - Department of Forest, Rangeland, and Fire Sciences, University of Idaho, PO Box 441135, Moscow, ID, 83844-1135, USA
Todd M. Ott & Eva K. Strand
Authors
- Todd M. Ott
- Eva K. Strand
- Cort L. Anderson
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Correspondence toEva K. Strand.
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Communicated by Brad Butterfield.
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Ott, T.M., Strand, E.K. & Anderson, C.L. Niche divergence of Abies grandis_–_Abies concolor hybrids.Plant Ecol 216, 479–490 (2015). https://doi.org/10.1007/s11258-015-0452-1
- Received: 26 August 2014
- Accepted: 20 January 2015
- Published: 31 January 2015
- Issue date: March 2015
- DOI: https://doi.org/10.1007/s11258-015-0452-1