期刊
AMERICAN JOURNAL OF BOTANY
卷 98, 期 8, 页码 1309-1316出版社
WILEY
DOI: 10.3732/ajb.1100012
关键词
homoploid hybrid speciation; ecological divergence; habitat isolation; reproductive isolation; ecological isolation; prezygotic isolation
资金
- National Science Foundation (NSF) [DEB-0816905, 0949424, DGE-0742306]
- American Iris Society Foundation
- Society for Louisiana Iris
- Direct For Education and Human Resources
- Division Of Graduate Education [0742306] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0949424] Funding Source: National Science Foundation
Premise of the Study: Homoploid hybrid speciation involves the evolution of reproductive isolation between a hybrid lineage and its progenitors without a change in chromosome number. Ecological divergence presumably plays a large role in the stabilization of hybrid lineages, as all homoploid hybrid species described to date are reported to be ecologically divergent from their progenitors. However, the described ecological divergence in most systems is anecdotal and has not been empirically tested. Methods: We assessed the vegetative response of Iris nelsonii, a homoploid hybrid species, and its three progenitor species, I. brevicaulis, I. fulva, and I. hexagona, to different abiotic conditions (i.e., varied sunlight availability and flooding conditions) that largely characterize the habitats of these four species in their natural habitats in Louisiana, USA. Key Results: The species differed in their responses to the water-level treatment for many of the response variables, including rhizome weight, ramet growth, plant height, and two principal components used to characterize the data. The species differed in their response to the light-level treatment for root allocation and the principal component used to characterize plant size. Iris nelsonii significantly differed from its progenitors, including its most closely related progenitor species, in response to many of the treatments. Conclusions: The differential response to abiotic habitat conditions of I. nelsonii suggests that this species is ecologically divergent from its progenitor species.
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