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Herbivory may promote a non-native plant invasion at low but not high latitudes

文献类型: 外文期刊

作者: Lu, Xinmin 1 ; He, Minyan 2 ; Tang, Saichun 3 ; Wu, Yuqing 4 ; Shao, Xu 2 ; Wei, Hui 2 ; Siemann, Evan 6 ; Ding, Jianqing 7 ;

作者机构: 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Hubei, Peoples R China

2.Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Hubei, Peoples R China

3.Chinese Acad Sci, Guangxi Inst Bot, Guangxi Key Lab Plant Conservat & Restorat Ecol K, Guilin 541006, Guangxi, Peoples R China

4.Henan Acad Agr Sci, Inst Plant Protect, Zhengzhou 450002, Henan, Peoples R China

5.Pearl River Fisheries Res Inst, Guangzhou 510380, Guangdong, Peoples R China

6.Rice Univ, Dept Biosci, Houston, TX 77005 USA

7.Henan Univ, Sch Life Sci, Kaifeng 475004, Henan, Peoples R China

关键词: Alternanthera philoxeroides; Alternanthera sessilis; biotic interaction hypothesis; enemy release; herbivory; latitudinal gradient; plant invasions; plant phenology; seasonal priority

期刊名称:ANNALS OF BOTANY ( 影响因子:4.357; 五年影响因子:5.488 )

ISSN: 0305-7364

年卷期: 2019 年 124 卷 5 期

页码:

收录情况: SCI

摘要: Background and Aims The strengths of biotic interactions such as herbivory are expected to decrease with increasing latitude for native species. To what extent this applies to invasive species and what the consequences of this variation are for competition among native and invasive species remain unexplored. Here, herbivore impacts on the invasive plant Alternanthera philoxeroides and its competition with the native congener A. sessilis were estimated across latitudes in China. Methods An common garden experiment spanning ten latitudinal degrees was conducted to test how herbivore impacts on A. philoxeroides and A. sessilis, and competition between them change with latitude. In addition, a field survey was conducted from 21 degrees N to 36.8 degrees N to test whether A. philoxeroides invasiveness changes with latitude in nature as a result of variations in herbivory. Key Results In the experiment, A. sessilis cover was significantly higher than A. philoxeroides cover when they competed in the absence of herbivores, but otherwise their cover was comparable at low latitude. However, A. philoxeroides cover was always higher on average than A. sessilis cover at middle latitude. At high latitude, only A. sessilis emerged in the second year. Herbivore abundance decreased with latitude and A. philoxeroides emerged earlier than A. sessilis at middle latitude. In the field survey, the ratio of A. philoxeroides to A. sessilis cover was hump shaped with latitude. Conclusion These results indicate that herbivory may promote A. philoxeroides invasion only at low latitude by altering the outcome of competition in favour of the invader and point to the importance of other factors, such as earlier emergence, in A. philoxeroides invasion at higher latitudes. These results suggest that the key factors promoting plant invasions might change with latitude, highlighting the importance of teasing apart the roles of multiple factors in plant invasions within a biogeographic framework.

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