Ma JW, Geng SL, Wang SB, Zhang GL, Fu WD & Shu B (2011). Genetic diversity of the newly invasive weed Flaveria bidentis (Asteraceae) reveals consequences of its rapid range expansion in northern China. Weed Research51, 363–372. Summary The South American weed Flaveria bidentis has spread rapidly across northern China since its introduction to the Tianjin area in 2001. To explore its introduction dynamics and mechanism of rapid range expansion in northern China, we examined genetic diversity in 26 populations across the invaded range, using inter‐simple sequence repeat markers. We found relatively high intraspecies genetic diversity (He = 0.279; I = 0.415) and wide‐ranging genetic variation within populations (He = 0.095–0.263; I = 0.160–0.383), with relatively high genetic diversity in both older established populations and some newly established populations. Approximately 78% of genetic variation resides within populations, according to analysis of molecular variance. The unweighted pair group method with arithmetic mean clustered populations into two groups, composed of most populations distributed along the G106 or G107 National Roads. Moreover, a Mantel test showed no significant correlation between geographical and genetic distances. The findings indicate that during F. bidentis invasion, sexual reproduction and multiple introductions have maintained high genetic diversity, while secondary introductions or admixtures of populations have mitigated losses of genetic variation caused by founder events and promoted local adaptation and colonisation. In addition, human‐mediated long‐distance seed dispersal, via National Roads, may have contributed to its weak geographical genetic structure and rapid range expansion in northern China. To prevent further introductions, imports should be monitored at Tianjin (the likely first arrival point). To control established populations, efforts should focus on populations with high genetic diversity, populations along the G106 and G107 National Roads and regions that are climatically similar to its native range.
There are few studies on nitrogen and phosphorus dispersion from the Yangtze estuary to adjacent Zhoushan sea areas in China. This study conducted numerical calculation to simulate the nitrogen and phosphorus transport from the Xuliujing section of the Yangtze Estuary to Zhoushan coastal areas. The effect of inorganic nitrogen transport was greater than that of active phosphorus. The concentration increment of inorganic nitrogen near Zhoushan, Daishan and Qushan islands were between 0.5mg/L and 0.8mg/L. The concentration increment of active phosphate near Shengsi was about 0.015mg/L, and those in the coastal areas of Qushan, east Daishan and northeast Zhoushan were between 0.015-0.02mg/L. To the north of Qushan Island, the percentage of inorganic nitrogen increment to the background was more than 70%, and those of other coastal areas were about 50%. The percentage of active phosphate increase to the background was more than 70% in the north of Shengsi, and the coastal areas from Dayangshan to Qushan were more than 50%. Daishan Island, East Coastal area and east side of Shengsi accounted for 30%.
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