Tintinnids (Ciliophora) and Other Net Microzooplankton (> 30 um) in Southwestern Atlantic Shelf Break Waters
Tintinnids (Ciliophora) and Other Net Microzooplankton (> 30 um) in Southwestern Atlantic Shelf Break Waters
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DOI：
10.1046/j.1439-0485.2001.01723.x
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发表时间：
2001-12
期刊：
影响因子：
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通讯作者：
G. Thompson;Viviana A. Alder;D. Boltovskoy
中科院分区：
文献类型：
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作者：
G. Thompson;Viviana A. Alder;D. Boltovskoy
. 1996年11月13日至18日，在阿根廷陆棚斜坡（约200米等深线-南纬40至56°之间）沿着16个站收集了76个垂直分层（0至100米）的30微米净微型浮游生物样本，估计了有孔虫、锡壳虫、多胱氨酸放射虫、翼足类和甲壳类幼虫阶段的比例。丁丁虫被鉴定为种。微型浮游动物的相对丰度评估和叶绿素a值允许定义两个对比组的站：“深”和“浅”。前者位于中上层、纯亚南极马尔维纳斯群岛海流沃茨，有孔虫比例较高，锡壳类比例较低，叶绿素a含量较低（所有差异均在0.1%水平上显著）。“浅”站位于巴塔哥尼亚海流与马尔维纳斯海流接触的温盐锋地区，一般具有较高的叶绿素a水平（高达3.7微克Chl a · l-1）。另一方面，tintinnid物种的分布，这两个地区之间没有歧视，虽然一些占主导地位的形式表现出更高的相对丰度在两组站之一。记录了26个tintinnid分类群，但只有6个占95%的标本鉴定。锡丁类类群具有丰富种少、稀有种多的特点。不同深度和纬度下的物种数和物种多样性差异不显著。在该地区发现了合恩角海流沃茨，因为存在可能起源于南太平洋中纬度地区的外来生物。
. Proportions of foraminifers, tintinnids, polycystine radiolarians, pteropods and crustacean larval stages were estimated in a collection of 76 vertically stratified (0 – 100 m) 30 µm net microplankton samples from 16 stations along the Argentine shelf-slope (around 200 m isobath – between 40 and 56° S), covered on 13 – 18 November 1996. Tintinnids were identified to species. Relative abundances of the microzooplankton assessed and chlorophyll a values allow to define two contrasting groups of stations: ‘deep’ and ‘shallow’. The former, located in pelagic, purely subantarctic Malvinas Current waters, hosted higher proportions of foraminifers and lower proportions of tintinnids, as well as less chlorophyll a (all differences were significant at the 0.1 % level). ‘Shallow’ stations were located in the area of the thermohaline front where the Patagonian Current comes in contact with the Malvinas Current, and were generally characterized by higher chlorophyll a levels (up to 3.7 µg Chl a · l–1). The distribution of tintinnid species, on the other hand, allowed no discrimination between these two areas, although some of the dominant forms showed much higher relative abundances in one of the two groups of stations. Twenty-six tintinnid taxa were recorded, yet only 6 accounted for 95 % of the specimens identified. Tintinnid taxocoenoses were characterized by a few abundant species and many rare ones. Numbers of tintinnid species and specific diversity did not differ noticeably with depth and latitude. Cape Horn Current waters were detected in the area by the presence of expatriated organisms presumably originating at mid-latitudes in the South Pacific Ocean.