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首页> 外文期刊>Diatom Research >ON THE IDENTITY AND DISTRIBUTION IN NORTHERN PORTUGAL OF THREE GOMPHONEMA SPECIES CURRENTLY MISIDENTIFIED AS GOMPHONEMA CLEVEI
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ON THE IDENTITY AND DISTRIBUTION IN NORTHERN PORTUGAL OF THREE GOMPHONEMA SPECIES CURRENTLY MISIDENTIFIED AS GOMPHONEMA CLEVEI

机译：北部误诊为小菜蛾的三种菜园的身份和分布

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摘要

Gomphonema specimens with wide axial areas collected from streams in Northern Portugal were examined by light and scanning electron microscopy. Three species were found and identified as G. rhombicum, G. uniserhombicum and G. ibericum. No specimens were found with the features of G. clevei sensu stricto, and previous records from the region with the latter name are regarded as representing one or a mixture of the three species examined herein. The three species differed in the fine details of the striae; double alternating poroids in G. rhombicum, slit-like with irregular outlines in G. uniserhombicum and single or divided slit-like poroids in G. ibericum. Differences in size and shape of the valve and axial area allow discrimination of at least medium-sized to large specimens of the three species. Gomphonema rhombicum was the most common species, sometimes occurring as dominant in the epilithon. Both G. uniserhombicum and G. ibericum were found more sparsely and always in communities containing G. rhombicum. All species were found in slightly acidic to circumneutral, well-oxygenated waters with low conductivity, poor in nutrients and with low organic content.
机译：从光波和扫描电子显微镜检查了葡萄牙北部河流中收集的具有宽轴向区域的气孔菌标本。发现并鉴定了三个物种：菱形G.，菱形G. uniserhombicum和G. ibericum。没有发现具有克氏克雷伯氏菌特征的标本，来自该地区的前一个记录以后者的名字被认为代表了本文研究的三种物种中的一种或两种。这三个物种在条纹的细节上有所不同。菱形G.中的两个交替轮状类人动物，uniserhombicum中的不规则轮廓的狭缝状人种，以及G. ibericum中的单个或分开的狭缝状类人物。阀的大小和形状以及轴向面积的差异允许区分至少三种中型到大型样品。菱形菌是最常见的物种，有时在表石上占优势。 Uniserhombicum和G. ibericum都比较稀疏，并且总是在含有菱形G.的社区中发现。发现所有物种都在弱酸性至中度充氧的水中，其电导率低，营养成分差且有机物含量低。

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