Systematic Review

Methods Literature Search Method To determine the current focuses of primary and peer-reviewed research on European warbler migration, a systematic review was conducted using the Thomson Reuters Web of Science database. An initial search for articles on European warbler migration was conducted by searching the terms ‘warbler migration’ using the ‘Title’ option of the Web of Science search engine. This had yielded a total of 108 results. Following the initial search, the results were refined using the Web of Science categories (‘Ornithology’) and Document Type categories (‘Article’). This excluded articles that were not primary articles and were not related to the field of ornithology. In addition, each article was screened manually for non-primary articles (ex. reviews, summaries, etc.). After these refinements, the number of results had lowered to 60 articles. Next, the results were refined further to include only studies on the migration of European warblers. This was done through manually screening and by using the ‘Countries/territories’ option to limit to studies conducted by European countries (Sweden, Germany, Italy, France, England, Switzerland, Spain, Ukraine, Scotland, Wales, Portugal, Poland, Netherlands, Greece, Finland, Czech Republic, Russia). The amount of literature found was 39 articles. This whole process is shown in the PRISMA diagram (Appendix A). Analysis of Literature The 39 studies from the Web of Science search results were screened and categorized with regard to a number of factors (Appendix B). The results were coded in terms of the topic of the study, the species studied, the migratory season of study and the method of capture. Lastly, these articles, provided information which identified gaps in the research of the four factors.

### 文献检索方法
为明确欧洲莺类迁徙相关主流原创与同行评议研究的当前热点，本研究依托汤森路透Web of Science（Thomson Reuters Web of Science）数据库开展系统综述。首先以Web of Science搜索引擎的"Title"（标题）字段检索关键词“莺类迁徙（warbler migration）”，共获得108条检索结果。随后通过Web of Science的分类选项（"Ornithology"，鸟类学（Ornithology））与文献类型（"Article"，研究论文（Article））对检索结果进行初筛，排除非原创性研究论文及非鸟类学领域文献；同时人工筛查排除综述、概述等非原创性研究。经上述筛选后，剩余文献共60篇。接下来进一步缩小筛选范围，仅纳入欧洲莺类迁徙相关研究：通过人工筛查并使用"Countries/territories"（国家/地区（Countries/territories））字段限定研究开展主体为欧洲国家（瑞典、德国、意大利、法国、英格兰、瑞士、西班牙、乌克兰、苏格兰、威尔士、葡萄牙、波兰、荷兰、希腊、芬兰、捷克共和国、俄罗斯），最终得到39篇文献。完整研究流程详见PRISMA流程图（附录A）。

### 文献分析
对Web of Science检索获得的39篇文献进行筛查与分类，分类维度涵盖多项指标（附录B）。研究以研究主题、研究物种、研究迁徙季以及捕获方法为维度进行编码。此外，本研究通过梳理文献信息，识别出上述四项研究维度中存在的研究空白。