Monitoring the progress parties have made toward meeting global biodiversity targets requires appropriate indicators. The recognition of invasive alien species (IAS) as a biodiversity threat has led to the development of specific targets aiming at reducing their prevalence and impact. However, indicators for adequately monitoring and reporting on the status of biological invasions have been slow to emerge, with those that exist being arguably insufficient. We performed a systematic review of the peer-reviewed literature to assess the adequacy of existing IAS indicators against a range of policy-relevant and scientifically valid properties. We found that very few indicators have most of the desirable properties and that existing indicators are unevenly spread across the components of the Driver-Pressure-State-Response and Theory of Change frameworks. We provide three possible reasons for this: (i) inadequate attention paid to the requirements of an effective IAS indicator, (ii) insufficient data required to populate and inform policy-relevant, scientifically robust indicators, or (iii) deficient investment in the development and maintenance of IAS indicators. This review includes an analysis of where current inadequacies in IAS indicators exist and provides a roadmap for the future development of indicators capable of measuring progress made toward mitigating and halting biological invasions.

中文翻译：

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现有指标未能充分监测实现外来入侵物种目标的进展情况

监测各方在实现全球生物多样性目标方面取得的进展需要适当的指标。将外来入侵物种 (IAS) 视为生物多样性威胁的认识已导致制定旨在减少其流行和影响的具体目标。然而，充分监测和报告生物入侵状况的指标出现得很慢，现有的指标可以说是不够的。我们对同行评议的文献进行了系统回顾，以评估现有 IAS 指标对一系列政策相关和科学有效的属性的充分性。我们发现，很少有指标具有大部分理想属性，并且现有指标在驾驶员-压力-状态-响应和变革理论框架的组件中分布不均。我们为此提供了三个可能的原因：(i) 对有效 IAS 指标的要求关注不足，(ii) 填充和告知政策相关、科学稳健的指标所需的数据不足，或 (iii) 对发展的投资不足和维护国际会计准则指标。该审查包括分析当前 IAS 指标存在哪些不足之处，并为未来开发能够衡量在减轻和阻止生物入侵方面取得的进展的指标提供了路线图。(i) 对有效 IAS 指标要求的关注不足，(ii) 填充和告知政策相关、科学稳健的指标所需的数据不足，或 (iii) 对 IAS 指标的开发和维护的投资不足。该审查包括分析当前 IAS 指标存在哪些不足之处，并为未来开发能够衡量在减轻和阻止生物入侵方面取得的进展的指标提供了路线图。(i) 对有效 IAS 指标要求的关注不足，(ii) 填充和告知政策相关、科学稳健的指标所需的数据不足，或 (iii) 对 IAS 指标的开发和维护的投资不足。该审查包括分析当前 IAS 指标存在哪些不足之处，并为未来开发能够衡量在减轻和阻止生物入侵方面取得的进展的指标提供了路线图。