PRELIMINARY RESEARCH ON SPECIES DISTRIBUTION OF PLANKTONIC OSTRACODS (HALOCYPRIDIDAE) IN THE ROSS SEA, ANTARCTICA
PRELIMINARY RESEARCH ON SPECIES DISTRIBUTION OF PLANKTONIC OSTRACODS (HALOCYPRIDIDAE) IN THE ROSS SEA, ANTARCTICA
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南极罗斯海浮游介形类（卤介虫科）物种分布的初步研究
DOI：
10.2307/1548720
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
K. Mckenzie
中科院分区：
文献类型：
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作者：
G. Benassi;M. Naldi;K. Mckenzie
本文报道了1987- 1988年意大利首次南极海洋考察期间所采集的浮游介形类的初步研究结果。在33个站点（31个在特拉诺瓦湾，2个在罗斯海近海）共收集了311个样本。在每个监测站，从不同深度（通常为50-100米深）的不同层中采集样本，并从整个水柱中采集综合样本。介形类-所有的贝壳纲盐环介科-在272个样本中被发现（占总数的87%）;所有的样本（54，224）都被单独检查。在物种水平上对成虫进行了分类鉴定（6，587只，即，12.15%）。共鉴定出4种（括号内为最高密度和相对丰度）：Alacia belgicae（4.00 ind·m-3，82.69%）、Metaconchoespisocheira（1.30 ind·m-3，16.65%）、Alacia hettacra（0.13 ind·m-3，0.61%）、Metaconchoespskogsbergi（0.07 ind·m-3，0.05%）。一些少年阶段被暂时确定为副乌头cf。brachyaskos。在几乎所有的站的优势种是Alacia belgicae，这似乎是一个真正的南极特有种。它发生在2个不同的大小范围。根据不同深度的样品，分析了介形类的总密度和优势种的密度分布。在Terranova湾，介形虫密度没有表现出任何明确的空间分布格局。介形虫密度与采样层深度呈正相关（P < 0.0001）。在大多数站，密度较高的中层和深层，介形虫有时甚至承担的作用，占主导地位的南极洲的组成部分，在数值上的重要性。按深度的分布格局似乎与介形类在罗斯海浮游动物群落的营养结构中的食虫性和肉食性作用一致。
ABSTRACT This paper reports the results of preliminary research on planktonic Ostracoda collected during the first Italian Oceanographic Expedition to Antarctica (1987-88). A total of 311 samples at 33 stations (31 in Terranova Bay and 2 farther offshore in the Ross Sea) was collected. At each station, samples were taken at various depths from different layers (usually 50–100 m deep), and an integrated sample from the entire water column was collected. Ostracods-all conchoeciine Halocyprididae—were found in 272 samples (87% of the total); all the specimens (54,224) were examined individually. Taxonomic identification at the species level was made for adults (6,587, i.e., 12.15% of all individuals). Four species were identified (the highest density and the relative abundance are reported in parentheses): Alacia belgicae (4.00 ind·m–3, 82.69%), Metaconchoecia isocheira (1.30 ind·m–3, 16.65%), Alacia hettacra (0.13 ind·m–3, 0.61%), Metaconchoecia skogsbergi (0.07 ind·m–3, 0.05%). Some juvenile stages were tentatively identified as Paraconchoecia cf. brachyaskos. In almost all the stations the dominant species was Alacia belgicae, which seems to be a true Antarctic endemic species. It occurred in 2 distinct size ranges. Density distribution of both total ostracods and adults of the dominant species has been analyzed considering samples collected at different depth layers. In Terranova Bay, ostracod density did not show any sharply defined spatial distribution pattern. A positive correlation (P < 0.0001) was found between ostracod density and sampling layer depth. At most stations, densities were higher in intermediate and deep layers, where ostracods sometimes even assumed the role of the dominant planktonic component in terms of numerical importance. The distribution pattern by depth seems consistent with the detritivorous and carnivorous role of Ostracoda in the trophic structure of the Ross Sea zooplankton community.