Alien Species First Records Database

The Alien Species First Records data set contains years (first records) when an established alien species was first recorded in a region (mostly countries, but also sub-national units). The first records were gathered in a collaborative effort involving >50 researchers worldwide from various sources consisting of online databases, scientific publications, reports and personal collections. A full list of data sources is provided in the data set and the data are described in more detail in the (compilation of data, list of data sources, delineation of continents, analyses etc.) in the following publication, which can be downloaded with free access: Seebens, H., Blackburn, T. M., Dyer, E. E., Genovesi, P., Hulme, P. E., Jeschke, J. M., … Essl, F. (2017). No saturation in the accumulation of alien species worldwide. Nature Communications, 8(1), 14435. https://doi.org/10.1038/ncomms14435 The data set was revised and further extended in version 1.2, which was introduced by: Seebens, H., Blackburn, T. M., Dyer, E. E., Genovesi, P., Hulme, P. E., Jeschke, J. M., … Essl, F. (2018). Global rise in emerging alien species results from increased accessibility of new source pools. Proceedings of the National Academy of Sciences, 115(10), E2264–E2273. https://doi.org/10.1073/pnas.1719429115 One of the above references needs to be cited in case of using the data set. Note that single years of first records were generated from original records in cases latest years (e.g., '<1920', 'pre-1920') or ranges (e.g., '1920s', 1920-1930') were provided in the original document following these rules: If latest years were provided (e.g., '<1920'), this year was taken (e.g., '1920') If ranges of years larger 20 years were provided in the original source, these records were removed. If ranges of years equal or less than 20 years were provided in the original document, a random year was selected from this time period. This was done to avoid artificial peaks at e.g. the mean value or the first year of that period. Consequently, some records represent years randomly drawn from the original time period, which makes the column 'FirstRecord' different from the original data source. The original first record as provided in the source is provided in the column 'FirstRecord_orig' of the data set.

外来物种首次记录数据集（Alien Species First Records data set）收录了已建立自然种群的外来物种在对应区域（多为国家，亦包含次级行政单元）的首次记录年份（first records）。本数据集的首次记录信息由全球超50名研究人员协作采集，数据来源涵盖在线数据库、学术出版物、研究报告及个人收藏。数据集附带完整的数据源清单，相关数据的详细说明（包括数据汇编、数据源列表、大陆区划方法、分析流程等）可通过以下免费获取的文献查阅：Seebens, H., Blackburn, T. M., Dyer, E. E., Genovesi, P., Hulme, P. E., Jeschke, J. M., … Essl, F. (2017). No saturation in the accumulation of alien species worldwide. *Nature Communications*（《自然通讯》）, 8(1), 14435. https://doi.org/10.1038/ncomms14435

该数据集于1.2版本中完成修订与扩展，相关更新说明由以下文献发布：Seebens, H., Blackburn, T. M., Dyer, E. E., Genovesi, P., Hulme, P. E., Jeschke, J. M., … Essl, F. (2018). Global rise in emerging alien species results from increased accessibility of new source pools. *Proceedings of the National Academy of Sciences*（《美国国家科学院院刊》，简称PNAS）, 115(10), E2264–E2273. https://doi.org/10.1073/pnas.1719429115

使用本数据集时，需引用上述两篇文献中的至少一篇。

需注意：当原始文献仅提供最晚年份（如‘<1920’、‘1920年前’）或年份区间（如‘1920年代’、‘1920-1930’）时，需按以下规则转换为单个首次记录年份：1. 若仅提供最晚年份（如‘<1920’），则直接取该年份（即‘1920’）；2. 若原始数据源提供的年份跨度超过20年，则直接剔除该条记录；3. 若原始文献提供的年份跨度小于或等于20年，则从该时间段内随机选取一个年份作为首次记录年份，以避免人为数据峰值（如取时间段均值或起始年份）。因此，部分记录的`FirstRecord`（首次记录年份）列数值为从原始时间段随机抽取的年份，与原始数据源中的初始记录存在差异；原始首次记录信息已存入数据集的`FirstRecord_orig`（原始首次记录）列中。

搜集汇总

背景与挑战

背景概述

该数据集记录了全球范围内外来物种首次在特定区域被记录的时间，包含约16,000条记录，数据来源于多国研究人员的合作收集。数据集提供了详细的数据处理规则，并支持相关研究引用。