Extant calcareous nannoplankton in the Australian Sector of the Southern Ocean (austral summers 1994 and 1995)
Extant calcareous nannoplankton in the Australian Sector of the Southern Ocean (austral summers 1994 and 1995)
复制标题
DOI：
10.1016/s0377-8398(00)00046-3
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发表时间：
2000-12-01
影响因子：
1.9
通讯作者：
Giraudeau, J
中科院分区：
文献类型：
--
作者：
Findlay, CS;Giraudeau, J
生活在澳大利亚和南极之间的钙质超微浮游植物分布在5个组合中，它们与表层和次表层水团的不同物理化学性质有关。生物群落的温度和盐度范围分别为2-15.7摄氏度和33.7-35.56‰，1994年南夏的最大细胞密度为9.63摄氏度和34.44‰，1995年南夏的最大细胞密度为12.8摄氏度和35.17‰。营养物质(磷酸盐、硅酸盐和硝酸盐)从表层到深层沿极地和垂直方向增加。钙质超微浮游动物的丰度和多样性呈向极地方向下降，主要变化位于亚热带和亚北极锋面。副热带锋区赤道以北50m以下、极地50m以上有较高的细胞密度。南极分流的极地所有样品中都没有球石生物体。鉴定出三种不同的形态类型，其中一种分布与副热带锋有关。在副热带锋面赤道方向的亚种中，细鳞鳞翅目线虫和细鳞鳞翅目线虫占主导地位，而赤道脊椎动物和细鳞鳞翅目线虫在这一锋面的两极占优势地位。在威德尔海以外首次发现了一种特殊的弱钙化物种群落。(C)2000 Elsevier Science B.V.保留所有权利。
Living calcareous nannoplankton in the region between Australia and Antarctica are distributed in five assemblages associated with distinct physico-chemical properties of surface and subsurface water masses. Temperature and salinity ranges for living assemblages were 2-15.7 degreesC and 33.7-35.56 parts per thousand, respectively, with maximum cell densities for austral summer 1994 found at 9.63 degreesC and 34.44 parts per thousand, and for austral summer 1995 at 12.8 degreesC and 35.17 parts per thousand. Nutrients (phosphate, silicate and nitrate) increase poleward and vertically from surface to depth. Abundance and diversity of calcareous nannoplankton decrease in a poleward direction with major shifts located across both the Subtropical and the Subantarctic Fronts. Higher cell densities were found below 50 m equatorward of the Subtropical Front and above 50 m poleward of this front. Poleward of the Antarctic Divergence coccolithophores are absent from all samples. Three different morphotypes of Emiliania huxleyi were identified, one of which has a distribution associated with the Subtropical Front. Of the subordinate species Syracosphaera spp, Calciosolenia murrayi and Umbellosphaera tenuis dominate equatorward of the Subtropical Front with Syracosphaera spp and Calcidiscus leptoporus dominant poleward of this front. A peculiar community of weakly calcified species is recorded for the first time outside the Weddell Sea. (C) 2000 Elsevier Science B.V. All rights reserved.