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- W1584216043 abstract "Recent benthonic Foraminifera from 73 stations in the Drake Passage between South America and Antarctica have been analyzed qualitatively and quantitatively. A bathymetric zonation as well as an areal distinction of faunal provinces can be recognized. Thus, assemblages of the shelf and upper bathyal zone of Tierra del Fuego (Cape Horn province) differ from those of the antarctic shelf (South Shetland province). Discanomalina vermiculata, Cibicides fletcheri, Eponides isabelleanus, Ehrenbergina pupa, Mississippina concentrica, Heronallenia kempii, and Polystomellina patagonica are typical species of the Cape Horn province. Reophax pilulifer, Cibicides refulgens, Cibicides grossepunctatus, and Cribrostomoides jeffreysi are common in the South Shetland province. Slight differences are also seen between assemblages of the Cape Horn province and the area of the Falkland Islands and of the Burdwood Bank (Falkland subprovince), where Elphidium crispum and Hoeglundina elegans are common. Predominantly calcareous populations were recovered from shallow-water stations in all these areas. Generally, a progressive increase in the percentage of arenaceous Foraminifera is seen with greater depth. Calcareous perforate Foraminifera are rare in most of the southern deep-sea areas, whereas in the north the group is still dominant at many stations. Partly this distribution is probably controlled by a somewhat higher position of the CaCO3 dissolution boundary in the cold Antarctic Bottom Water of the south. Significant arenaceous genera of the deep sea are Rhabdammina, Hyperammina, Saccammina, Psammosphaera, Ammolagena, Reophax, Hormosina, Cribrostomoides, Recurvoides, Ammobaculites, Cyclammina, Martinottiella, Eggerella, and Karreriella. Calcareous imperforate Foraminifera, such as different species of the genus Pyrgo, reach diameters up to 3.5 mm. A bathymetric zonation was established by plotting the upper depth limits of the most common and significant foraminiferal species. The significance of isobathyal and heterobathyal species relative to the bathymetric zonation or to other parameters is discussed. Displacement of shallow-water assemblages into deep water was recognized in several cases." @default.
- W1584216043 created "2016-06-24" @default.
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- W1584216043 date "2013-03-14" @default.
- W1584216043 modified "2023-09-26" @default.
- W1584216043 title "Distribution of Recent Benthonic Foraminifera in the Drake Passage" @default.
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- W1584216043 doi "https://doi.org/10.1029/ar017p0251" @default.
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