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Планктонные фораминиферы из поверхностных осадков Охотского моря

Планктонные фораминиферы из поверхностных осадков Охотского моря

Abstract

Исследованы качественный и количественный составы планктонных фораминифер, а также степень растворения раковин в 65 пробах поверхностных осадков (0-5 см), отобранных в 42-м рейсе НИС «Академик Лаврентьев» в Охотском море вдоль меридионального профиля (149˚50′ в.д.). Идентифицированы 7 видов и разновидностей фораминифер: Neogloboquadrina pachyderma sin., N. pachyderma dex., Globigerina bulloides, G. quinqueloba, Globigerinita glutinata, G. uvula и Globorotalia scitula. В танатоценозах по всему изученному про- филю доминировала субарктическая разновидность N. pachyderma sin. (65-100 %). Установлено, что общая концентрация раковин в осадках с севера к центральной части возрастала от 0,1 до 3538 экз./г и по направле- нию к Курильским островам постепенно снижалась до 60 экз./г. Следы растворения раковин отмечены в районе Курильской котловины и пришельфовой зоне. Полученные данные позволили уточнить положение границ био- географических районов, выделяемых с учетом особенностей экологических структур танатоценозов планктонных фораминифер, и дать их полную характеристику.

Qualitive and quantitive structure of planktonic foraminifera and level of shell dissolution were studied in 65 surface sediments (0-5 сm) sampled in the Sea of Okhotsk along the longitudinal section (149˚50′ E) during 42 cruise «Academician Lavrentiev». Six species of foraminifera including two variants of one species were found: Neogloboquadrina pachyderma sin., N. pachyderma dex., Globigerina bulloides, G. quinqueloba, Globigerinita glutinata, G. uvula, Globorotalia scitula. Subarctic species N. pachyderma sin. dominates in sediments along the section (65-100 %). It is established that foraminiferal abundance increase from the north to the central part from 0.1 to 3,838 specimens per gram of dry sediment and decrease to the Kuril Islands to 60 specimens per gram. Sell dissolution was marked in Kuril Basin and sub-shelf areas. Obtained data allow to specify borders of the biogeographical regions with specific ecological structure of foraminifera thanatocenosis and give them full description.

Keywords

ПЛАНКТОННЫЕ ФОРАМИНИФЕРЫ, ПОВЕРХНОСТНЫЕ ОСАДКИ, ОХОТСКОЕ МОРЕ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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