A microscopical study of diatom phytoplankton in deep crater Lake El'gygytgyn, Northeast Siberia
A microscopical study of diatom phytoplankton in deep crater Lake El'gygytgyn, Northeast Siberia
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西伯利亚东北部埃尔吉吉特金湖深火山口硅藻浮游植物的微观研究
DOI：
10.1127/1864-1318/2005/0116-0147
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Melles
中科院分区：
文献类型：
--
作者：
H. Cremer;B. Wagner;O. Juschus;M. Melles
摘要：2003年夏季对北极西伯利亚东北部一个深、冷、低导、贫营养的火山口湖El'gygytgyn湖的浮游硅藻群落进行了调查。共鉴定出5种浮游硅藻：Cy-clostephanos campus、小环藻Cyclotella ocellata、三分小环藻Cyclotella tripartita、中肋骨条藻Pliocaenicus costatus和强泰隐肋藻Stephanocostis chantaicus。光镜和部分扫描电镜照片记录了这五个分类群的形态细节。此外，还提供了生态和地理数据。这是S. chantaicus的化石，也是贝加尔湖地区以外首次发现中肋骨棘鲷的化石。2003年夏季的硅藻群落以小环藻（Cyclotella ocellata）为主（>96%），这是一种形态变异很大的硅藻。冰覆盖期间（2003年5月至6月）硅藻硅藻壳的高浓度和积累率表明冰下浮游植物有相当大的增长。
Abstract : A survey of the planktonic diatom community was carried out during summer2003 in Lake El’gygytgyn, a deep, cold, low conductive and oligotrophic crater lake inthe Northeast Siberian Arctic. Five planktonic diatom species were identified: Cy-clostephanos dubius , Cyclotella ocellata , Cyclotella tripartita , Pliocaenicus costatus ,and Stephanocostis chantaicus . The morphological details of the five taxa are docu-mented by light and partly also scanning electron micrographs. Additionally, ecologicaland biogeographic data are provided. This is the first evidence of S. chantaicus in a north-east Siberian lake and one of the first findings of P. costatus outside the Baikal Lake re-gion. The diatom community in summer 2003 was almost monospecificly dominated by Cyclotella ocellata (>96%), a species that displays a tremendous morphological variabil-ity. High concentrations and accumulation rates of diatom frustules during the ice-cov-ered period (May–June 2003) indicated considerable under-ice phytoplankton growth.