О роли видов бентосных фораминифер Alabaminella weddellensis и Epistominella exigua в палеоокеанологических реконструкциях
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Аннотация
Статья посвящена изучению экологии видов бентосных фораминифер Alabaminella weddellensis и Epistominella exigua. На основе опубликованных микропалеонтологических и статистических данных по трем колонкам донных осадков из юго-западной части Южной Атлантики и одной колонке, отобранной в северо-западной части Тихого океана, выявлены особенности распределения этих видов в отложениях последних 300 тыс. лет. Указанные районы относятся к олиготрофным зонам открытого океана, удаленным от областей апвеллинга и находящимся вне областей сезонного ледового покрова. Показано, что в отличие от E. exigua максимальное развитие вида A. weddellensis соответствует интервалам, характеризующимся повышенным видовым разнообразием и, вероятно, более продуктивными условиями.
Abstract
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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