《环境昆虫学报》

红火蚁Solenopsis invicta Buren有翅生殖蚁飞行距离和高度有限，故飞行中有可能受到某些景观因素阻挡而扩散受阻，但对此尚未见相关报道。本研究选择浙江23个红火蚁发生点，模拟了因受河流、林地、坡地、建筑物等阻挡扩散区蚁巢密度下降幅度与阻挡物长度、宽度、高度的关系。结果表明，蚁巢密度下降比例与阻挡物长度和扩散源头区长度两者之比值呈显著S型曲线关系，与阻挡物宽度呈显著对数曲线关系，但与阻挡物高度无显著关系。当阻挡物与扩散源头区长比达到0.8时，阻挡作用即明显增强，达到2.0时阻挡效果即较为显著；当阻挡物宽度不足50 m时，阻挡效果25%~100%不等，但达到100 m以上时阻挡作用相当明显。所得结果可增进对红火蚁扩散规律的认识，对监测和防控工作具一定指导价值。

英文摘要:

Most alate adults of the red imported fire ant, Solenopsis invicta Buren, fly for only a limited distance and altitude, so their flights might be easily blocked by certain landscape factors, which as a result may hinder the dispersal of this ant. However, such an effect has not been investigated fully. Here, we selected 23 invaded sites in Zhejiang Province and modeled the relationship between the proportion of S. invicta nest density decline and the length, width and height of the barriers existing in local landscape (e.g., rivers, woodlands, hills, buildings, etc.). Our results showed that the extent of nest-density decreases (blocking efficiency) due to landscape-factor blocking has a significant S-curve relationship with the ratio of length of barriers to length of the source area that supposedly ever provided alate adults to be blocked during flights, and has a significant logarithmic-curve relationship with the width of barriers. However, we did not find significant relationship with the height of barriers. When the ratio of barrier length to S. invicta source-area length reaches 0.8, the blocking efficiency is evidently elevated, particularly as the ratio reaches 2.0. If the width of barriers is less than 50 meters, the blocking efficiency varies from 25% to 100%, but the efficiency arises to a consistently high level in cases barrier width increases to over 100 m. Our results will hopefully enrich the knowledge on S. invicta dispersal features, and could be taken into consideration when we monitor and control this fire ant.

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