Fluvioralfsia iberica gen. et sp. nov., Fluvioralfsiaceae fam. nov.: The first freshwater member of the Ralfsiales (Phaeophyceae), collected from streams in Spain.

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Andrés Mellado-Díaz, José Luis Moreno, María Verdugo-Althöfer, John D Wehr, Gary W Saunders
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引用次数: 0

Abstract

A novel brown alga inhabiting freshwater streams in Spain is described herein as Fluvioralfsia iberica gen. et sp. nov. Phylogenetic analyses establish it as a novel lineage within the Ralfsiales, Fluvioralfsiaceae fam. nov. It is an epilithic crust, typically orbicular with a radial growth pattern, formed by dichotomous fan-like branching of filaments. Crusts show a bilateral symmetry with horizontal medial filaments that bend upward and downward to form circular or semilunar protrusions in concentric bands that overlap at different levels. Older crusts are easily seen with the naked eye, becoming greater than 50 cm in diameter and 1 cm thickness and can cover a high percentage of the stream bottom in optimal habitats. Differentiating characters from other families of Ralfsiales include the absence of phaeophycean hairs and plurangia and, most notably, the unangia originating intercalarily from lower cells of paraphyses. Most populations were located in first- to third-order calcareous streams and rivers, at altitudes of 14-870 m.a.s.l., in the mountainous Cantabrian coast, northern Spain, and one river in southeast Spain. Sites were entirely nonmarine, 2-118 km from the sea, with median conductance of 219 μS · cm-1 (range 112-859) in well-oxygenated, oligo-mesotrophic waters and moderate to high current velocities. As freshwater brown algae are a species-poor group, Fluvioralfsia iberica represents an important addition to the global freshwater algal flora and raises additional questions about the origins of phaeophytes in fresh waters.

伊比利亚飞虱属,11月,飞虱科。十一月:第一个淡水成员的Ralfsiales (Phaeophyceae),从西班牙的溪流收集。
本文描述了一种栖息在西班牙淡水溪流中的新型褐藻,称为Fluvioralfsia iberica gen. et sp. 11 .系统发育分析确定它是fluvioralfsiales, Fluvioralfsiaceae家族中的一个新谱系。它是一种外皮,典型的圆形,呈放射状生长模式,由细丝的二分扇形分支形成。地壳两侧对称,水平内侧丝向上和向下弯曲,形成圆形或半月形的突出,在不同的水平重叠的同心带。较老的结壳很容易用肉眼看到,直径超过50厘米,厚度超过1厘米,在最佳栖息地可以覆盖很大比例的河底。与其他科不同的特征包括没有藻毛和多毛,最值得注意的是,无毛起源于鞘鞘下部细胞的间隙。大多数种群分布在海拔14-870米的一至三级钙质溪流和河流中。位于西班牙北部多山的坎塔布连海岸,西班牙东南部有一条河。地点完全为非海洋,距海2 ~ 118 km,中位电导为219 μS·cm-1(范围112 ~ 859),分布在富氧、低中营养、中高流速的水域。由于淡水褐藻是一个物种贫乏的群体,伊比利亚Fluvioralfsia iberica代表了全球淡水藻群的重要补充,并提出了关于淡水中附生植物起源的额外问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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