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Neither Biased Sex Ratio nor Spatial Segregation of the Sexes in the Subtropical Dioecious Tree Eurycorymbus cavaleriei Sapindaceae

作者: 佚名  来源:不详  发布时间:2015-04-14  浏览数:1926  
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论文题目

Neither Biased Sex Ratio nor Spatial Segregation of the Sexes in the Subtropical Dioecious Tree Eurycorymbus cavaleriei (Sapindaceae)

论文作者

Puxin Gao1,4, Ming Kang2,3, Jing Wang2,3, Qigang Ye1 and Hongwen Huang1,2,3∗

刊物

Journal of Integrative Plant Biology

卷/期

51 (6): 604–613

摘要

  Knowledge of sex ratio and spatial distribution ofmales and females of dioecious species is both of
evolutionary interest and of cucial importance for biological conservation.Eurycorymbus cavaleriei,
the only species in the genus Eurycorymbus (Sapindaceae), is a dioecious tree endemic to subtropical
montane forest in South China. Sex ratios were investigated in 15 natural populations for the two de-
fined ages (young and old). Spatial distribution ofmales and females was further studied in six large
populations occurring in different habitats (fragmented and continuous). The study revealed a slight
trend ofmalebiased sex ratio in both ages of E. cavaleriei, but sex ratio of most populations (13 out
of 15) did not display statistically significant deviation from equality. All of the four
significantly male-biased populations in the young class shifted to equality or even female-biased.
The Ripley’s K analysis of the distribution of males with respect to females suggested that
individuals of the opposite sexes were more randomly distributed rather than spatially structured.
These results suggest that the male-biased sex ratioin E. cavaleriei may result from the precocity
of males and habitat heterogeneity. The sex ratio and the sex spatial distribution pattern are unlikely to constitute a serious threat to the survival of the species.

  论文下载:
Neither Biased Sex Ratio nor Spatial Segregation of the
Sexes in the Subtropical Dioecious Tree Eurycorymbus cavaleriei (Sapindaceae)
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