期刊
OECOLOGIA
卷 164, 期 3, 页码 657-664出版社
SPRINGER
DOI: 10.1007/s00442-010-1675-4
关键词
Dioecy; Distichlis spicata; Niche partitioning; Sex ratio; Sexual system
类别
资金
- Portland State University
- National Science Foundation [DEB 0743461]
- Direct For Biological Sciences
- Division Of Environmental Biology [0743461] Funding Source: National Science Foundation
Spatial segregation of the sexes (SSS) occurs in many dioecious angiosperms, but little data are available on the fitness advantages, if any, for males and females. We examined whether reciprocally transplanted male and female seedlings of Distichlis spicata, a dioecious grass species that exhibits extreme SSS, differed in their responses to microhabitats and competition treatments. Plants grown without conspecific competitors grew equally well in both male- or female-majority habitats, suggesting that male and female plants do not have differential resource needs at the juvenile life-history stage. However, plants subject to intra-sexual competition were significantly larger than plants subject to inter-sexual competition, suggesting that niche partitioning may occur in D. spicata.
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