INRAE, UR EABX, Cestas, France.
OFB, EcoAqua, Vincennes, France.
Environ Monit Assess. 2024 Aug 29;196(9):860. doi: 10.1007/s10661-024-12980-w.
The Water Framework Directive (WFD) requires member states to routinely assess the river ecological status using community-based indices. However, there is still a lack of published WFD-compliant methods for the French West Indies, especially using diatom-based indices. Martinique and Guadeloupe exhibit diverse landscapes shaped by their complex geological history and tropical climatic conditions. These strong particularities make the existing indices developed for the European mainland unusable. Based on diatom sampling from to 2013 (607 samples) and through multivariate analyses, we developed the Indice Diatomique des Antilles (IDA). We first identified the key abiotic factors influencing diatom communities on both islands, and then characterized taxon sensitivity by considering their presence probability along a pressure gradient.. The index was based on the presence and relative abundance of these taxa in each sample. The last step consisted of using new data from the 2014-2022 sampling surveys (457 samples) as a validation dataset to verify IDA accuracy. Our results suggest that the IDA methodology is well designed to assess the ecological status of rivers in the West Indies.
《水框架指令》（WFD）要求成员国定期使用基于群落的指数对河流生态状况进行评估。然而，针对法属西印度群岛，特别是使用基于硅藻的指数，仍然缺乏已发布的符合 WFD 的方法。马提尼克岛和瓜德罗普岛呈现出多样化的景观，这是由其复杂的地质历史和热带气候条件塑造的。这些强烈的特殊性使得为欧洲大陆开发的现有指数无法使用。基于 2013 年（607 个样本）的硅藻采样，并通过多元分析，我们开发了安的列斯硅藻指数（IDA）。我们首先确定了影响两个岛屿硅藻群落的关键非生物因素，然后通过考虑其在压力梯度下的存在概率来表征分类群的敏感性。该指数基于每个样本中这些分类群的存在和相对丰度。最后一步是使用 2014-2022 年采样调查的新数据（457 个样本）作为验证数据集来验证 IDA 的准确性。我们的结果表明，IDA 方法学非常适合评估西印度群岛河流的生态状况。
