Cid-Rodríguez María, González-Paz Lorena, Delgado Cristina
University of Vigo, Vigo, Spain University of Vigo Vigo Spain.
Biodivers Data J. 2024 Mar 19;12:e115601. doi: 10.3897/BDJ.12.e115601. eCollection 2024.
The Mediterranean Region holds significant ecological importance, characterised by its unique climate, biodiversity and the crucial role it plays in global ecosystems. Mediterranean streams are naturally highly-stressed environments mainly due to fluctuations in water quantity. River flow generally varies from perennial to ephemeral and temporary rivers constitute significant water resources. Streams that flow through Balearic Islands are subjected to these conditions. The majority of these streams sustain water flow for 4-5 months annually, with exceptions noted for streams associated with springs, which typically maintain water throughout most of the year.Benthic diatoms are widely recognised as reliable bioindicators of water quality, used in many aquatic ecosystems. Analysing diatom communities and their biodiversity serves as a valuable tool to ensure the ecological and sustainable utilisation of water resources as well as the accurate development of guidelines for their conservation.The field of diatom taxonomy and distribution plays a crucial role in advancing our understanding of aquatic ecosystems and their biodiversity. Species of the genus are extensively found throughout the Mediterranean Region, including the Balearic Islands. However, they have rarely been investigated in temporary streams.
This study presents the first record of Morales, Novais, Wetzel, Morais & Ector, outside the type locality and being the second record in Europe. In this study, the authors found this taxon in one temporary stream of Majorca Island, Torrent des Castellot in November 2005 (Balearic Islands). occurred at 2.6% abundance in this stream with oligotrophic waters (0.052 mg∙l of nitrate), slightly alkaline pH values (7.8) and water conductivity levels of 626.5 µS cm. This species was recorded in the biofilm of the stones together with other taxa such as (Kützing) Czarnecki (39.2%), Lange-Bertalot & Reichardt (28.9%) and (Lange-Bertalot) Levkov (20.4%). The frustules found in the examined material have similar dimensions and a higher fibulae count (8-11 in 10 μm vs. 6-10 in 10 μm) compared to the type material of . The habitat characteristics in which this species was found are described, together with LM micrographs of this taxon.
地中海地区具有重要的生态意义，其特点是拥有独特的气候、生物多样性以及在全球生态系统中发挥的关键作用。地中海溪流自然处于高压力环境，主要是由于水量波动。河流水流通常从常年流水到季节性流水变化，临时性河流构成了重要的水资源。流经巴利阿里群岛的溪流就面临这些情况。这些溪流中的大多数每年维持水流4至5个月，与泉水相关的溪流除外，这类溪流通常一年中大部分时间都保持有水。底栖硅藻被广泛认为是水质的可靠生物指标，在许多水生生态系统中都有应用。分析硅藻群落及其生物多样性是确保水资源生态和可持续利用以及准确制定保护准则的宝贵工具。硅藻分类学和分布领域在增进我们对水生生态系统及其生物多样性的理解方面发挥着关键作用。 属的物种在地中海地区广泛分布，包括巴利阿里群岛。然而，它们在临时性溪流中很少被研究。
本研究首次记录了莫拉莱斯、诺瓦伊斯、韦策尔、莫赖斯和埃克托描述的 ，该记录不在模式产地，且是欧洲的第二次记录。在本研究中，作者于2005年11月在马略卡岛的一条临时性溪流托伦特·德·卡斯特洛特（巴利阿里群岛）中发现了这个分类单元。该物种在这条贫营养水域（硝酸盐含量为0.052毫克/升）、pH值略呈碱性（7.8）且水电导率为626.5微西门子/厘米的溪流中，丰度为2.6%。该物种与其他分类单元一起记录在石头的生物膜中，如 （屈茨ing）查尔内茨基（39.2%）、 兰格 - 贝托洛特和赖夏特（28.9%）以及 （兰格 - 贝托洛特）列夫科夫（20.4%）。在所检查材料中发现的 硅藻细胞壳与 的模式材料相比，尺寸相似，但每10微米的横肋数量更多（8 - 11条对6 - 10条）。描述了发现该物种的栖息地特征以及该分类单元的光学显微镜照片。
