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首页> 外文期刊>Journal of Paleolimnology >Factors affecting diatom distribution in floodplain lakes of the southeast Murray Basin, Australia and implications for palaeolimnological studies
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Factors affecting diatom distribution in floodplain lakes of the southeast Murray Basin, Australia and implications for palaeolimnological studies

机译：澳大利亚Murray盆地东南洪泛区湖泊中硅藻分布的影响因素及其对古湖泊学的启示

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Diatom assemblages of surface sediments in 46 billabongs from four river floodplains in the southeast Murray-Darling Basin, Australia were sampled to investigate drivers of species distribution. The principal purpose of the study was to derive information to aid interpretation of diatom-based palaeoecological studies of these systems and of floodplain lakes more generally. Patterns in billabong diatom assemblages in relation to river reach, hydrology and farming intensity on surrounding land were examined, as were correlations with water quality variables. Seasonal variation in billabong water quality was high relative to spatial variation, and spatial patterns in billabong water quality were weak. In contrast, strong patterns were evident in diatom assemblages. Three main patterns were observed: (1) a distinction between billabongs dominated by planktonic diatoms from those dominated by benthic and attached forms; (2) differences in diatom assemblages in billabongs on different river reaches; and (3) differences in assemblages in billabongs with different hydrology. Of all water quality variables tested, total phosphorus (TP), total nitrogen (TN) and pH exerted the strongest independent influence on diatom distribution; however, only TP remained an important variable when species variation due to river reach, hydrology, and aquatic plant cover was taken into account. The weak influence of water quality on diatom distribution is interpreted as reflecting the dichotomy between plankton and non-plankton-dominated billabongs, the influence of hydrology and biogeography, the lack of strong spatial water quality gradients and the high degree of temporal variability in water quality. The findings show that diatom records from billabong sediments can provide evidence of long-term changes in the abundance of aquatic macrophytes and hydrology. They also suggest that merging calibration data sets across regions for the purpose of improving diatom transfer functions for water quality reconstruction is of limited value for floodplain lakes, and that performance is more likely to be gained by boosting site numbers within regions.
机译：在澳大利亚Murray-Darling盆地东南部的四个河漫滩中，从46个河滩中提取了表面沉积物的硅藻组合，以研究物种分布的驱动力。该研究的主要目的是获得信息，以帮助对这些系统以及更泛泛的泛滥湖泊进行基于硅藻的古生态学研究。考察了Billabong硅藻组合的模式与周围土地的河段，水文和耕作强度之间的关系，以及与水质变量的相关性。相对于空间变化，比拉邦水质的季节性变化较大，而比拉邦水质的空间格局较弱。相反，在硅藻集合体中明显图案很明显。观察到三种主要模式：（1）以浮游性硅藻为主的Billabongs与以底栖和附着形式为主的Billabongs有所区别； （2）不同河段河床中硅藻组合的差异； （3）水文不同的台球组合的差异。在所有测试的水质变量中，总磷（TP），总氮（TN）和pH值对硅藻分布的影响最大。但是，当考虑到由于河道，水文和水生植物覆盖引起的物种变化时，只有TP仍然是重要的变量。水质对硅藻分布的弱影响被解释为反映了浮游生物与非浮游生物为主的Billabongs之间的二分法，水文学和生物地理学的影响，缺乏强的空间水质梯度以及水质的高度时间变异性。研究结果表明，来自Billabong沉积物的硅藻记录可提供水生植物和水文丰度长期变化的证据。他们还建议，为改善水质重建的硅藻传递函数而跨区域合并校准数据集对于洪泛区湖泊而言具有有限的价值，并且通过增加区域内的站点数量更可能获得性能。

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