Freshwater diatom biogeography in the Canadian Arctic Archipelago
Freshwater diatom biogeography in the Canadian Arctic Archipelago
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DOI：
10.1111/j.1365-2699.2004.01143.x
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发表时间：
2004-12-01
影响因子：
3.9
通讯作者：
Hamilton, PB
中科院分区：
文献类型：
--
作者：
Bouchard, G;Gajewski, K;Hamilton, PB
目的 记录加拿大北极地区硅藻与环境因素的生物地理分布。地点加拿大北极群岛。方法从湖泊沉积物中提取硅藻并使用标准方法进行处理。使用地理信息系统绘制了稀疏估计的物种丰富度、硅藻浓度（阀门 cc(-1)）和硅藻丰度。测定了湖泊的理化参数。结果在研究区62个湖泊中共发现63属326个类群。在任何一个湖泊中都发现了多达 85 个和低至 8 个类群，稀疏估计的物种丰富度与湖泊规模相关。附近的湖泊可能有截然不同的硅藻组合。许多类群的分布有限。响应面和排序技术表明，大量类群更喜欢北极较冷的地区，而其他类群的丰度则受到湖水化学参数（如 TKN 和 SiO2）的影响。 主要结论 尽管许多类群是常见的，并且在整个研究区域都有发现，但硅藻组合在北极表现出区域差异。有些类群在群岛北部或南部都没有发现，而另一些则仅限于特定地区。新划定的属显示出可解释的地理模式，并且可能与环境因素有关，这表明这种更自然的分类可能会增强我们对硅藻生态学的理解。需要地理、物理和化学因素来解释北极硅藻的分布。
Aim Document the biogeographical distributions of diatoms in the Canadian Arctic in relation to environmental factors.Location The Canadian Arctic Archipelago.Methods Diatoms were extracted from lake sediments and treated using standard methods. Rarefaction-estimated species richness, diatom concentrations (valves cc(-1)), and diatom abundance were mapped using a Geographic Information System. The physical and chemical parameters of the lakes were measured.Results A total of 326 taxa from 63 genera were found in 62 lakes of the study area. Up to 85 and as low as eight taxa were identified in any one lake, and rarefaction-estimated species richness correlated with lake size. Nearby lakes could have greatly different diatom assemblages. Many taxa showed limited distributions. Response surfaces and ordination techniques indicate that a large number of taxa prefer colder regions of the Arctic while the abundance of others was influenced by lake water chemical parameters such as TKN and SiO2.Main Conclusions Although many taxa were common and found across the study area, diatom assemblages showed regional differences in the Arctic. Some taxa were not found in either the northern or southern parts of the Archipelago and others were restricted to particular regions. Newly delineated genera showed interpretable geographical patterns and could be related to environmental factors, suggesting that this more natural grouping may enhance our understanding of diatom ecology. Geographical, physical, and chemical factors are needed to explain diatom distributions in the Arctic.