Botanica Pacifica. A journal of plant science and conservation Preprint
Article first published online: 25 SEPTEMBER 2015 | DOI: 10.17581/bp.2015.04204
Study of Entrained Antarctic Diatoms from the Southwest Indian Ocean
Vartika Singh 1 & Neelu Singh 2
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226007, India
2 National Centre for Antarctic & Ocean Research, Headland Sada, Vasco-da-Gama, Goa 403804, India
The study of surface sediments collected at a depth of 4100 m from the Southwest Indian Ocean reveals presence of only biogenic siliceous morphotypes containing high amount of Antarctic diatoms. In addition the sediment also contains radiolarians, silicoflagellates, and sponge spicules in decreasing order of abundance after diatoms. The diatoms make about 70 % of the total siliceous components and the assemblage is dominated by the Antarctic diatoms Thalassiosira lentiginosa (Janisch) Fryxell, Fragilariopsis kerguelensis (O’Meara) Hustedt and Eucampia antarctica (Castracane) Mangin. This study tries to look for the possible mechanism of entrained Antarctic diatoms from their place of origin, Southern Ocean to as far as the southern limit of Indian Ocean. The long range lateral transport has been viewed to have occurred under the influence of deep moving Antarctic bottom water from the Southern Ocean to the Indian Ocean. The role of lateral transport in deep ocean siliceous sediment re-deposition cannot be overlooked in the global ocean carbon transport.
Сингх В., Сингх Н. Исследование антарктических диатомей, принесенных из Юго-Западного Индийского океана. Исследование поверхностных отложений с глубины 4100 м юго-западной части Индийского океана показало преобладание в осадках биогенных кремнистых морфотипов, содержащих большое количество антарктических диатомовых водорослей. Кроме того, осадки содержат также радиолярии, силикофлагелляты и спикулы губок в порядке убывания обилия после диатомовых водорослей. Диатомеи составляют около 70 % от общего объема кремнистых компонентов, и в сообществе доминируют антарктические диатомеи Thalassiosira lentiginosa (Janisch) Fryxell, Fragilariopsis kerguelensis (O’Meara) Hustedt и Eucampia antarctica (Castracane) Mangin. Исследование представляет попытку поиска возможного механизма дальнего переноса антарктических диатомей от их места происхождения – Южного океана, до южной границы Индийского океана. Столь продолжительный горизонтальный перенос представляется возможным благодаря глубинным течениям придонных вод из Южного в Индийский океан. Горизонтальный перенос глубинными океаническими течениями кремнистых отложений не может быть проигнорирован в вопросах глобального транспорта углерода в океане.
Keywords: lateral transport, Antarctic Bottom Water, Thalassiosira lentiginosa, Fragilariopsis kerguelensis, Carbonate Compensation Depth, Southern Ocean, горизонтальный перенос, антарктические глубинные воды, уровень карбонатной компенсации, Южный океан
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