A high-resolution dinoflagellate cyst record from latest Holocene sediments in Koljo Fjord, Sweden
A high-resolution dinoflagellate cyst record from latest Holocene sediments in Koljo Fjord, Sweden
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DOI：
10.1016/s0034-6667(03)00116-7
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发表时间：
2004-01-01
影响因子：
1.9
通讯作者：
Filipsson, HL
中科院分区：
文献类型：
--
作者：
Harland, R;Nordberg, K;Filipsson, HL
一个高分辨率的鞭毛藻囊肿记录详细的最新的全新世沉积物保存在瑞典西部的一个淤泥峡湾。Koljo峡湾的特点是咸淡水条件，以及间歇性的深水更新和氧气消耗。这些数据提供了生活在地表水中的浮游植物种群的信息，包括使用实际生态学方法对营养物可用性和盐度制度可能发生的变化。囊肿记录提供了证据，表明在过去155年左右的时间里，峡湾地表水内的鞭毛藻种群有明显的波动。KG1A岩心的鞭毛藻囊记录表明，自1938年以来，鞭毛藻囊总数和Lingulodinium polydrum均增加了10倍，并且从1980年左右开始，鞭毛藻的组合从高含量的大五钠（Pentapharsodinium dalei）转变为高含量的L. polydrum和Protoceratium reticulatum。这些波动单独和/或共同表明峡湾内可能发生的文化变化；北大西洋涛动对深水更新和季节性的影响；营养增强（富营养化？）；增加了水柱的稳定性。(C) 2003 Elsevier B.V.版权所有
A high-resolution dinoflagellate cyst record is detailed for the very latest Holocene sediments preserved in a silled fjord from western Sweden. Koljo Fjord is characterised by brackish water conditions together with intermittent deep-water renewal and oxygen depletion. The data provide information derived from the phytoplankton populations living in the surface waters, including possible changes to the nutrient availability and salinity regimes using an actualistic ecological approach. The cyst record provides evidence that the dinoflagellate populations within the surface waters of the fjord over the last 155 years or so have fluctuated markedly. The dinoflagellate cyst record from Core KG1A demonstrates a 10-fold increase in both total cyst numbers and Lingulodinium polyedrum since c. 1938, and a shift from assemblages with high Pentapharsodinium dalei to those with high L. polyedrum and Protoceratium reticulatum from about 1980. These fluctuations are singly and/or collectively indicative of possible cultural changes within the fjord; the effects of the North Atlantic Oscillation on both deep-water renewal and seasonality; nutrient enhancement (eutrophication?); and increased water column stability. (C) 2003 Elsevier B.V. All rights reserved.