Distribution of Recent Foraminifera Off West Coast of Central America
Distribution of Recent Foraminifera Off West Coast of Central America
复制标题
中美洲西海岸近海有孔虫的分布
DOI：
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发表时间：
1957
期刊：
影响因子：
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通讯作者：
R. E. Arnal
中科院分区：
文献类型：
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作者：
O. L. Bandy;R. E. Arnal
对中美洲西海岸6至6 270英尺深处沉积物中有孔虫的分布进行了调查。对阿卡普尔科、丰塞卡湾和巴拿马湾沿岸地区的36个样本进行了检查。一些样本代表中间区域。有孔虫的复合频率分布是针对深度，温度和盐度的变化绘制的。动物区系如下。内大陆架动物（0-150英尺）：Elphidium属，miliolids，Nonionella basispinata，streblus spp.外大陆架动物（151-400英尺）：Discorbis panamensis、Planulina ornata、Uvigerina（条纹种）。上亚热带动物群（401- 2，000英尺）：Boliacuminata，Boliacumuda vars.，缓生上口线虫中深海动物群（2，001 - 4，000英尺）：玻利维亚种，Bolivinita minuta、Blimina affinis、Blimina spinifera、Bliminella exilis tenuata、Cassidulina delicata、Chilostomella ovoidea、Uvigerina peregrina、Valvulineria inaequalis。低海拔动物群（4，001 - 6，270英尺）：Bulimina clava、Cassidulinoides tenuis、Pullenia bulloides、Pyrgo murrhina、Uvigerina proboscidea、Valvulineria araucana、Virgulina nodosa。相关的近海趋势包括：（1）远离海岸的物种数量增加;（2）在上半深海区以外的有孔虫数量增加，而在深海区以外的有孔虫数量减少;（3）在外大陆架区浮游生物最多;（4）在4 000英尺深度以下有大量放射虫和硅藻。
A survey was made of the foraminiferal distribution in the sediments off the west coast of Central America, between depths of 6 and 6,270 feet. Thirty-six samples were examined from areas off Acapulco, off the Gulf of Fonseca, and from the Gulf of Panama. A few of the samples represent intervening areas. The composite frequency distribution of Foraminifera is plotted against changes in depth, temperature, and salinity. Faunal zones are recognized as follows. Inner Shelf fauna (0-150 feet): Elphidium spp., miliolids, Nonionella basispinata, streblus spp. Outer Shelf fauna (151-400 feet): Discorbis panamensis, Planulina ornata, Uvigerina (striate species). Upper Bathyal fauna (401-2,000 feet): Bolivina acuminata, Bolivina seminuda vars., Epistominella bradyana. Middle Bathyal fauna (2,001-4,000 feet): Bolivina spp., Bolivinita minuta, Bulimina affinis, Bulimina spinifera, Buliminella exilis tenuata, Cassidulina delicata,Chilostomella ovoidea, Uvigerina peregrina, Valvulineria inaequalis. Lower Bathyal fauna (4,001-6,270 feet): Bulimina clava, Cassidulinoides tenuis, Pullenia bulloides, Pyrgo murrhina, Uvigerina proboscidea, Valvulineria araucana, Virgulina nodosa. Associated offshore trends include: (1) increase in number of species away from shore; (2) increase in foraminiferal number out to the upper bathyal zone and a decrease beyond; (3) greatest abundance of plankton in the outer shelf zone; (4) and abundant Radiolaria and diatoms below depths of 4,000 feet.