Monothalamous Soft-Shelled Foraminifera at an Abyssal Site in the North Pacific: A Preliminary Report
Monothalamous Soft-Shelled Foraminifera at an Abyssal Site in the North Pacific: A Preliminary Report
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北太平洋深海地点的单丘脑软壳有孔虫：初步报告
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
T. Toyofuku
中科院分区：
文献类型：
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作者：
A. Gooday;H. Kitazato;S. Hori;T. Toyofuku
软壳单鳞有孔虫是东北大西洋深海小型底栖动物中数量丰富、种类繁多的一种，但在太平洋从未被系统地记录过。我们研究了来自亚北极北太平洋深海平原(北纬48°05.43‘，东经176°55.06’；水深5289米)的样品(0-1厘米层，表面积52.8平方厘米)的32-63微米和63微米组分。这些残留物估计产生了2876个有孔虫(每10平方厘米=545个)，其中75%出现在0.5厘米的上层，几乎一半出现在32-63微米的部分。而不到三分之一的个体(30.5%)和大约一半的形态种(121种中的56种)是软壳单翅型。其中许多，特别是眼镜蛇，都很小，最大尺寸为120微米。根据我们对这一样本的分析，以及之前在北大西洋和西北印度洋的结果，我们认为这些鲜为人知的类群一直是氧气充足地区深海小型动物的重要组成部分。
Soft-shelled monothalamous foraminifera, including species belonging to the suborders Allogromiida and Astrorhizida (families Saccamminidae and Psammosphaeridae), are an abundant and diverse component of the meiofauna in the deep NE Atlantic but have never been systematically documented in the Pacific Ocean. We examined the 32–63 µm and >63 µm fractions of a sample (0–1 cm layer, surface area 52.8 cm2) from an abyssal plain in the subarctic North Pacific, close to the Aleutian Trench (48°05.43′ N, 176°55.06′ E; 5289 m water depth). The residues yielded an estimated 2876 stained foraminifera (=545 per 10 cm2) of which >75% occurred in the upper 0.5 cm layer and almost half in the 32–63 µm fraction. Rather less than a third (30.5%) of individuals, and about half of the morphospecies (56 out of 121), were soft-shelled monothalamous forms. Many of these, particularly the saccamminids, were tiny, <120 µm in maximum dimension. Based on our analysis of this sample, and previous results in the North Atlantic and NW Indian Oceans, we suggest that these poorly known taxa are a consistently important component of the abyssal meiofauna in well-oxygenated areas.