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Testing mechanisms of compensatory fitness of dioecy in a cosexual world
Wang, Yunyun; Mazer, Susan J.; Freckleton, Robert P.; Yuan, Zuoqiang; Wang, Xugao; Du, Yanjun3; Lin, Luxiang4; Wang, Xihua5; Sang, Weiguo3; Liu, Xiaojuan3; Hao, Zhanqing

Questions All else being equal, populations of dioecious species with a 50:50 sex ratio have only half the effective reproductive population size of bisexual species of equal abundance. Consequently, there is a need to explain how dioecious and bisexual species coexist. Increased mean individual seed mass, fecundity, and population density have all been proposed as attributes of unisexual individuals or populations that may contribute to the persistence or resilience of dioecious species. To date, no studies have compared sympatric dioecious and cosexual species with respect to all three components of fitness. In this study, we sought evidence for these compensatory advantages (higher seed mass, greater seed production per unit basal area, and higher population density) in dioecious species. Location Five 20-25 ha forest dynamic plots spanning a latitudinal gradient in China, including two temperate, two subtropical, and one tropical forest. Methods We used a phylogenetically corrected generalized linear modelling approach to assess the phylogenetic dependence and joint evolution of sexual system, seed mass and production, and ecological abundances among 48-333 species and 32,568-136,237 individuals per forest. Results Across all five forests, we detected no consistent advantage for dioecious relative to sympatric cosexual species with respect to mean individual seed mass, seed production or the density of stems in any size class. Conclusions Our study suggests that seed traits may provide compensatory mechanisms in some forests, but most often the coexistence of sexual systems cannot be explained by advantages of dioecy related to seed quality and demographic parameters. Future investigations of the factors that promote coexistence may increase our understanding by expanding the search to include attributes such as lifespan and tolerance or resistance to herbivores.

Subject AreaPlant Sciences ; Environmental Sciences & Ecology ; Forestry
Indexed BySCI
WOS IDWOS:000469999900002
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Appl Ecol, Key Lab Forest Ecol & Management, Shenyang, Liaoning, Peoples R China
2.Mazer, Susan J.] Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA
3.Freckleton, Robert P.] Univ Sheffield, Dept Anim & Plant Sci, Sheffield, S Yorkshire, England
4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
5.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Kunming, Yunnan, Peoples R China
6.East China Normal Univ, Tiantong Natl Field Observat Stn Forest Ecosyst, Shanghai, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yunyun,Mazer, Susan J.,Freckleton, Robert P.,et al. Testing mechanisms of compensatory fitness of dioecy in a cosexual world[J]. JOURNAL OF VEGETATION SCIENCE,2019,30(x):413-426.
APA Wang, Yunyun.,Mazer, Susan J..,Freckleton, Robert P..,Yuan, Zuoqiang.,Wang, Xugao.,...&Hao, Zhanqing.(2019).Testing mechanisms of compensatory fitness of dioecy in a cosexual world.JOURNAL OF VEGETATION SCIENCE,30(x),413-426.
MLA Wang, Yunyun,et al."Testing mechanisms of compensatory fitness of dioecy in a cosexual world".JOURNAL OF VEGETATION SCIENCE 30.x(2019):413-426.
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