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Narrow Hybrid Zone Between Two Subspecies of Big Sagebrush, Artemisia tridentata (Asteraceae). III. Developmental Instability

1995; Wiley; Volume: 82; Issue: 9 Linguagem: Inglês

10.2307/2446068

1537-2197

D. Carl Freeman, John H. Graham, David W. Byrd, E. Durant McArthur, William Turner,

Botany and Plant Ecology Studies

American Journal of BotanyVolume 82, Issue 9 p. 1144-1152 Systematics and Evolution Narrow hybrid zone between two subspecies of big sagebrush, Artemisia tridentata (Asteraceae). III. Developmental instability D. Carl Freeman, D. Carl Freeman Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this authorJohn H. Graham, John H. Graham Department of Biology, Berry College, Mt. Berry, Georgia, 30149Search for more papers by this authorDavid W. Byrd, David W. Byrd Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this authorE. Durant McArthur, E. Durant McArthur USDA Forest Service, Shrub Sciences Laboratory, 735 N. 500 E. Provo, Utah, 84606Search for more papers by this authorWilliam A. Turner, William A. Turner Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this author D. Carl Freeman, D. Carl Freeman Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this authorJohn H. Graham, John H. Graham Department of Biology, Berry College, Mt. Berry, Georgia, 30149Search for more papers by this authorDavid W. Byrd, David W. Byrd Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this authorE. Durant McArthur, E. Durant McArthur USDA Forest Service, Shrub Sciences Laboratory, 735 N. 500 E. Provo, Utah, 84606Search for more papers by this authorWilliam A. Turner, William A. Turner Department of Biological Sciences, Wayne State University, Detroit, Michigan, 48202;Search for more papers by this author First published: 01 September 1995 https://doi.org/10.1002/j.1537-2197.1995.tb11586.xCitations: 28 Author for correspondence. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Stable hybrid zones are believed to occur because gene dispersal is opposed by selection, but the nature of this selection remains unclear. The dynamic equilibrium model postulates that hybridization disrupts coadapted gene complexes, leading to alterations in development and subsequent hybrid unfitness. Alternatively, the bounded hybrid superiority model assumes that selection is due to exogenous factors. Here, we examine the developmental instability of sagebrush across a narrow hybrid zone. The results show no difference among the parental and hybrid taxa for the majority of comparisons examined. When significant differences in developmental instability were observed, one of the parental taxa (mountain big sagebrush) was typically the least developmentally stable. Hybrids were found to be the least developmentally stable for only two of the 28 comparisons studied. Interestingly, for some comparisons, hybrids were the most developmentally stable. These results contradict predictions of the dynamic equilibrium model. The sagebrush hybrid zone does not appear to be maintained by endogenous selection, as there is little indication that development is disrupted by hybridization. Citing Literature Volume82, Issue9September 1995Pages 1144-1152 RelatedInformation