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Changes to the Spatial Distribution of Ageratum conyzoides (Asterales: Asteraceae) Due to Red Imported Fire Ants Solenopsis invicta (Hymenoptera: Formicidae) in China

文献类型： 外文期刊

作者： Huang, Jun 1 ; Xu, Yijuan 1 ; Zeng, Ling 1 ; Lu, Yongyue 1 ; Liang, Guangwen 1 ;

作者机构： 1.S China Agr Univ, Lab Insect Ecol, Guangzhou 510642, Guangdong, Peoples R China

2.S China Agr Univ, Red Imported Fire Ant Res Ctr, Guangzhou 510642, Guangdong, Peoples R China

3.Zhejiang Acad Agr Sci, Res & Dev Ctr Flower, Hangzhou 311202, Zhejiang, Peoples R China

关键词： spatial dependence;spatial structure;spatial species distribution

期刊名称：JOURNAL OF INSECT BEHAVIOR （ 影响因子：1.309； 五年影响因子：1.174 ）

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收录情况： SCI

摘要： Solenopsis invicta is an aggressive, destructive and invasive ant. It has a profound impact on the native species in its environment. In this paper, we studied the effect of S. invicta on the invasive weed Ageratum conyzoides in the field. Using grid sampling and geostatistical analysis, we found that the density of A. conyzoides increased significantly in the presence of S. invicta. Furthermore, the spatial distribution of A. conyzoides was affected by S. invicta. The spatial structure of A. conyzoides emergence was aggregated. Sites where S. invicta was present were described by a Gaussian model, whereas a spatial model was used to describe the sites in the absence of S. invicta. The range of spatial dependence was 7.07 m for sites with a high density of S. invicta, whereas the spatial dependence was 1.46 m for sites with a low density of S. invicta and 3.14 m for control sites. Semivariogram models based on grid sampling of actual emerging A. conyzoides densities were used to produce contour maps of A. conyzoides densities in the field.

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