Quantitative trophic reconstruction from sedimentary diatom assemblages: a cautionary tale
Quantitative trophic reconstruction from sedimentary diatom assemblages: a cautionary tale
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DOI：
10.1111/j.1365-2427.1993.tb00784.x
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发表时间：
1993-08
影响因子：
2.7
通讯作者：
S. Fritz;J. Kingston;D. Engstrom
中科院分区：
文献类型：
--
作者：
S. Fritz;J. Kingston;D. Engstrom
摘要1 210 Pb测年沉积物芯的硅藻地层学用于重建密歇根州下半岛四个寡/中营养湖泊的近期营养历史，根据现代硅藻组合和40年来水化学变量的校准数据集，密歇根州的两个湖泊，跨越一系列的营养浓度和生物生产力。2总磷重建表明，磷浓度在过去200年中变化很小，现代值与定居时的值大致相同。然而，四湖中有三个湖泊在伐木和定居时确实显示出磷浓度较高的趋势，随后又下降。3将营养变化的定量推断与基于硅藻物种组成和沉积物中硅藻、生物硅和碳酸盐积累的解释进行了比较，各种证据之间存在一些差异。这些比较被用来讨论重建的性质和营养变化的幅度的各种代理的敏感性。
SUMMARY 1 The diatom stratigraphy of 210Pb-dated sediment cores is used to reconstruct the recent trophic histories of four oligo/mesotrophic lakes in the lower peninsula of Michigan, U.S.A. Quantitative trends in total phosphorus concentrations are reconstructed from the cores with a calibration data set based on modem diatom assemblages and water-chemistry variables in forty-two Michigan lakes that span a range of nutrient concentrations and biological productivities. 2 The total phosphorus reconstructions suggest that phosphorus concentrations have changed very little over the last 200 years, with modern values approximately equal to those at the time of settlement. Three of the four lakes, however, do show a trend to higher phosphorus concentrations at the time of logging and settlement and a subsequent decline. 3 The quantitative inferences of trophic change are compared with interpretations based on diatom species composition and the accumulation of diatoms, biogenic silica and carbonate in the sediments, and some discrepancies occur among the various lines of evidence. These comparisons are used to discuss the sensitivity of various proxies for reconstructing the nature and magnitude of trophic change.