Dinoflagellate cysts from sediment traps deployed in the Bellingshausen, Weddell and Scotia seas, Antarctica
Dinoflagellate cysts from sediment traps deployed in the Bellingshausen, Weddell and Scotia seas, Antarctica
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DOI：
10.1016/s0377-8398(99)00016-x
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发表时间：
1999-08-01
影响因子：
1.9
通讯作者：
Pudsey, CJ
中科院分区：
文献类型：
--
作者：
Harland, R;Pudsey, CJ
在南极洲别林斯高晋海、威德尔海和斯科舍海的6个长期（1-2年）沉积物捕集器系泊中发现了甲藻孢囊。这些捕集器大多停泊在海床附近，对云状层进行取样，位于最大海冰界限以内和以北。孢囊的数量，再加上组合的组成，加强了最大海冰限制的重要性，作为一个现代的地理边界甲藻孢囊的分布。来自异养甲藻的孢囊在从陷阱中回收的组合中所占比例最高。一个陷阱采样的出口生产，揭示了那些采样的霞状层的孢囊通量的差异不大。囊钻似乎是最高的地区最接近南极收敛，北部的最大海冰限制，并以高养分供应。然而，沉积物捕集器组合与在相同或附近地点从岩心顶部样品中回收的沉积物捕集器组合存在差异。这些差异，在更大数量的孢囊，并在更高数量的圆形，棕色Protoperidinium孢囊的陷阱，可能反映了每年的差异，在该地区的初级生产力和/或孢囊生产。在某些地区，由于底层水流的活动，例如南极绕极流产生的底层水流，沉积物记录可能保存的关于当地地表水生产力的信息很少。(C)1999 Elsevier Science B. V.保留所有权利。
Dinoflagellate cysts have been recovered from six long-term (1-2 yr) sediment trap moorings deployed in the Bellingshausen, Weddell and Scotia seas, Antarctica. These traps, mostly moored near the sea bed to sample the nepheloid layer, were located both within and to the north of the maximum sea-ice limit. The numbers of cysts, together with the composition of the assemblages, reinforce the importance of the maximum sea-ice limit as a modern biogeographic boundary for the distribution of dinoflagellate cysts. Cysts derived from heterotrophic dinoflagellates make up the highest proportions within the assemblages recovered from the traps. One trap sampled the export production, revealing little difference in cyst flux over those sampling the nepheloid layer. Cyst Bur appears to be highest in areas closest to the Antarctic Convergence, north of the maximum sea-ice limit, and to high nutrient availability. There are, however, differences between the sediment trap assemblages and those recovered from core-top samples at the same or nearby sites. These differences, in the greater number of cysts, and in the higher numbers of round, brown Protoperidinium cysts in the traps, may reflect annual differences in the primary productivity and/or cyst production in the area. In some areas the sediment record may preserve little information about local surface water productivity because of the activity of bottom water currents, for example those arising from the Antarctic Circumpolar Current. (C) 1999 Elsevier Science B.V. All rights reserved.