Natural and medical sciences

2018 Issue №4

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On the benthic foraminifera species of Alabaminella weddellensis and Epistominella exigua in paleo-oceanologic reconstructions



The article examines the ecology of benthic foraminifera species of Alabaminella weddellensis and Epistominella exigua based on published works. Micropaleontological and statistical data of three long sediment cores taken from the southwestern part of the South Atlantic and one core obtained in the northwestern Pacific were used to study the characteristic of the species distribution in the sediments during last 300 thousand years. These areas belong to the oligotrophic ecosystems of the open ocean, remote from the upwelling regions and located outside the seasonal ice cove zones. It is shown that unlike E. exigua, the maximal content of the species A. weddellensis corresponds to the intervals characterized by increased species diversity and, probably, more productive conditions.


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