Background Here, we present the data obtained from the samples collected in a field campaign during the spring of 2015 which aims for a better understanding of the diversity and distribution patterns of freshwater diatoms in Madeira Island. Following European and Portuguese standards and recommendations for routine diatom sampling and analysis, we collected samples in 40 sites, distributed in 27 permanent streams and identified the diatom species present, using general diatom floras and studies in Portuguese freshwater diatoms. New information Little is known about the diversity and distribution of freshwater diatom assemblages from Madeira Archipelago. This study reports a survey in 40 sites in Madeira Island distributed in 27 permanent streams. A total of 965 diatom (Bacillariophyta) occurrences were recorded, belonging to 130 different taxa from 44 genera and 27 families. The families with the highest number of occurrences were Bacillariaceae (176), Achnanthidiaceae (135) and Naviculaceae (133). The two diatom endemisms, described previously in Madeira Island (Lange-Bertalot 1993), Nitzschia macaronesica Lange-Bertalot and Navicula madeirensis Lange-Bertalot, were only observed in a small number of sites, located mostly at Laurissilva forest. Sixty species are new records, not only to Madeira Island, but also to the Madeira Archipelago.

中文翻译：

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马德拉岛溪流中的硅藻多样性和分布（葡萄牙）

背景 在这里，我们展示了从 2015 年春季野外活动中收集的样本中获得的数据，该活动旨在更好地了解马德拉岛淡水硅藻的多样性和分布模式。按照欧洲和葡萄牙的常规硅藻取样和分析标准和建议，我们在 40 个地点收集了样本，分布在 27 个永久溪流中，并使用一般硅藻植物群和葡萄牙淡水硅藻研究确定了存在的硅藻种类。新信息 关于马德拉群岛淡水硅藻组合的多样性和分布知之甚少。这项研究报告了对马德拉岛 40 个地点的调查，这些地点分布在 27 个永久性溪流中。共记录了 965 次硅藻（Bacillariophyta）的出现，属于 44 属 27 科 130 个不同的分类群。出现次数最多的科是芽孢杆菌科（176）、芨芨科（135）和舟形科（133）。先前在马德拉岛 (Lange-Bertalot 1993) 描述的两种硅藻特有性，Nitzschia macaronesica Lange-Bertalot 和 Navicula madeirensis Lange-Bertalot，仅在少数地点观察到，主要位于 Laurissilva 森林。60 个物种是新的记录，不仅是马德拉岛，而且马德拉群岛也是如此。仅在少数地点观察到，主要位于劳里西尔瓦森林。60 个物种是新的记录，不仅是马德拉岛，而且马德拉群岛也是如此。仅在少数地点观察到，主要位于劳里西尔瓦森林。60 个物种是新的记录，不仅是马德拉岛，而且马德拉群岛也是如此。