Diatom assemblages in the surface water of the Indian Sector of the Antarctic Surface Water in summer of 1999/2000
Diatom assemblages in the surface water of the Indian Sector of the Antarctic Surface Water in summer of 1999/2000
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发表时间：
2005
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通讯作者：
Gomi;Yasushi;Umeda;Haruko;Fukuchi;Mitsuo;Taniguchi;Akira
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作者：
Gomi;Yasushi;Umeda;Haruko;Fukuchi;Mitsuo;Taniguchi;Akira
利用1999/2000年夏季破冰船Shirase号JARE-41巡航期间采集的样品，研究了南大洋南极地表水印度段表层水中硅藻群落的丰度和物种组成。在向西的腿(腿1)，硅藻组合的丰度在地理上是比较一致的，而物种组成在地理上是不同的镶嵌方式。1号腿的优势种为羽状伪菱形藻。和纤细指甲线虫Chaetoceros sp.参见Dichaeta和Chaetoceros overectus。在东腿(第2条腿)上，60̊E以东和以西群落的丰度和种类组成不同，以西群落数量较大，以细叶锦鸡儿为主，而以东群落较小，以羽状绒毛草属植物为主。这些硅藻组合在腿1上被分成4个簇，在腿2上被分成3个簇。在腿1上，这些簇的镶嵌分布也很明显，而在腿2上，则是相当简单的东西差异。这些地理差异似乎受到当地海冰的影响
Abundance and species composition of diatom assemblages in surface water of the Indian Sector of the Antarctic Surface Water of the Southern Ocean were examined using samples gathered during the JARE-41 Cruise of the icebreaker Shirase in the summer of 1999/2000. On the westward leg (Leg 1), abundance of the diatom assemblage was geographically rather uniform, while species composition was different geographically in mosaic manner. Dominant species on Leg 1 were the pennate Pseudo-nitzschia spp. and the centric Dactyliosolen tenuijunctus, Chaetoceros sp. cf. dichaeta and Chaetoceros neglectus. On the eastward leg (Leg 2), abundance and species composition were different east and west of 60 ̊E. The community to the west was large in abundance and dominated by D. tenuijunctus, while that to the east was small and dominated by the pennate Fragilariopsis species. These diatom assemblages were grouped into four clusters on Leg 1 and three on Leg 2. Mosaic distribution of the clusters was again evident on Leg 1, while rather simple east-west difference was the case on Leg 2. These geographical variations seem to be affected by local sea ice