263 欧美昆虫
P1: Nearly 2000 insects and weedy plants invaded NA, many of these become pests. K&MP: 40% pests from exotic. E.g. 要timely及时地 采取措施因为之前严重的生态系统影响.
P2: piecemeal research on general factors influencing the invasion success. No theory of invasion ecology. Plant-herbivore theory increase understanding of tole of host plants and host plant communities. Hope this can help to understand critical ecological factors underpinning(支持,巩固,构成xx的基础)the successful immigrant herbivorous insects. H, g and climatic differences explain why EU insects vast more success to NA.