Taxonomic richness in the diatom flora of Himalayan streams (Garhwal, India)
Taxonomic richness in the diatom flora of Himalayan streams (Garhwal, India)
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DOI：
10.11464/diatom1985.20.0_123
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
P. Nautiyal;R. Nautiyal;K. Kala;J. Verma
中科院分区：
文献类型：
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作者：
P. Nautiyal;R. Nautiyal;K. Kala;J. Verma
在阿拉克南达-恒河发现硅藻新纪录，阿拉克南达河发现硅藻32种，恒河硅藻26种，共计58个分类单元。阿拉克南达-恒河的硅藻分类群已从早些时候报道的193个增加到251个。最近，在阿拉克南达河的支流曼达基尼河排放的曼达基尼盆地的200个种、变种和变型中，发现了77个硅藻分类群新记录，从而使加赫瓦尔喜马拉雅地区的硅藻种类达到30个属中的328个。其中3个新记录为环藻(Centales)，其余325个为Pennales。羽状植物区系以两栖类(210个分类群)为主，隶属18个属。舟形藻(50种)、Cymbella(39种)、Gomhonema(29种)和Nitzschia(28种)，而Pinnularia(12种)在其余13个属中占主导地位，共52种，在属水平上表现出丰富的多样性。其余成分包括6属45种蛛形目昆虫，主要是针叶蝉属(19种)、针叶蝉属(14种)和网翅蛛属(9种)，仅有13种蜂类(网翅亚目12种和贝类1种)。值得注意的是，57只单翅目昆虫只属于3个属。阿奇南特(49岁)在他们中占据主导地位。舟形藻属和钉螺属是种类最丰富的属。Achnanths(33，38)在阿拉克南达-恒河和Mandakini盆地的物种丰富，分别比Navrula(25，28)丰富。从高海拔(Mandakini盆地)到低海拔(Ganga)，蜂类(12~2只)、单翅目昆虫(45~34只)和双翅目昆虫(115~103只)总体减少，而蛛形目昆虫(32只)在中等海拔(Alakanda)相对较高。
New records of diatoms were observed from the River Alaknanda-Ganga, 32 from the Alaknanda and 26 from the Ganga amounting to 58 taxa. The tally of diatom taxa from the Alaknanda-Ganga has risen from 193 reported earlier to 251. Recently, 77 new records of diatom taxa were found among 200 species, varieties and forms from the Mandakini basin drained by River Mandakini, a tributary of the Alaknanda, thus increasing the count to 328 of 30 genera in Garhwal Himalaya. Three of the new records were Cyclotella (centrales) and remaining 325 were pennales. The pennate flora was dominated by biraphids (210 taxa) represented by 18 genera. Navicula (50), Cymbella (39), Gomphonema (29) and Nitzschia (28), while Pinnularia (12) dominated among the rest 13 genera that represented 52 species, showing richness at generic level. The remaining components included 45 araphids of 6 genera, largely Synedra (19), Fragilaria (14) and Diatoma (9) and only 13 raphidioids (Eunotia 12 and Peronia 1). Notably, 57 monoraphids belonged to just 3 genera. Achnanthes (49) dominated them. Navicula and Achnanthes were the most species rich genera. Achnanthes (33, 38) was species rich than Navicula (25, 28) in the Alaknanda-Ganga and Mandakini basin, respectively. There was an overall decrease in the raphidioids (12 to 2), monoraphids (45 to 34) and biraphids (115 to 103) from high (Mandakini basin) to low elevation (Ganga), while araphids (32), were comparably higher at mid elevations (Alaknanda).