The distribution of freshwater chironomidae (Insecta: Diptera) across treeline near the Lower Lena River, Northeast Siberia, Russia.
The distribution of freshwater chironomidae (Insecta: Diptera) across treeline near the Lower Lena River, Northeast Siberia, Russia.
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淡水摇蚊科（昆虫纲：双翅目）在俄罗斯西伯利亚东北部勒拿河下游附近林线的分布。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
L. Cwynar
中科院分区：
文献类型：
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作者：
D. Porinchu;L. Cwynar
对西伯利亚东北部沿沿着一条跨越林木线的样带采集的31个湖泊表层沉积物中的蠓类残留物进行了分析，以评估蠓类相对于林木线的现代分布。不同的苔原，森林苔原，森林地区进行了鉴定。Abiskomyia，Parakiamiella黑，Hydrobaenus/Oliveridia主要发现在苔原湖泊，而Zalutschia zalutschicola和Microtendipes仅限于森林苔原或森林湖泊。一个尖锐的划定存在于苔原/森林苔原过渡带相对于属Corynocera。Oliveri主要分布于冻原湖泊，而C. Ambiga仅在森林地区发现。测量了32个环境变量，描述了样带中湖泊的物理，化学和湖沼学特征。Redundancy分析（RDA）显示，摇蚊分布和六个测量的环境变量（颗粒有机碳，颗粒有机氮，铁，锌，湖的深度，和Secchi深度）之间存在统计上显着的关系，但不是表面湖水温度。典型变量分析（CVA）表明，叶绿素a，湖泊深度，pH值，锶最大限度地分离苔原，森林苔原，和森林湖泊彼此。这些结果说明树线作为摇蚊分布的生态边界的重要性。发生在特定摇蚊分类群的树线分布的突然变化表明，亚化石摇蚊分析可以用来推断过去的树线位置的变化。
Surficial sediment from 31 lakes along a transect spanning treeline in northeast Siberia was analyzed for midge remains in order to assess the modem distribution of midges relative to treeline. Taxa distinct to tundra, forest-tundra, and forest areas were identified. Abiskomyia, Parakiefferiella nigra, and Hydrobaenus/Oliveridia were found predominantly in tundra lakes, whereas Zalutschia zalutschicola and Microtendipes were restricted to forest-tundra or forest lakes. A sharp delineation exists at the tundra/forest-tundra transition zone with respect to the genus Corynocera. Corynocera oliveri was found chiefly in tundra lakes whereas C. ambigua was found solely in forested areas. Thirty-two environmental variables describing the physical, chemical, and limnological characteristics of the lakes in the transect were measured. Redundancy analysis (RDA) revealed that statistically significant relationships exist between chironomid distributions and six of the measured environmental variables (particulate organic carbon, particulate organic nitrogen, iron, zinc, lake depth, and Secchi depth), but not surface lake-water temperature. Canonical variate analysis (CVA) demonstrated that chlorophyll a, lake depth, pH, and strontium maximized separation of tundra, forest-tundra, and forest lakes from one another. These results illustrate the importance of treeline as an ecological boundary for the distribution of chironomids. The abrupt changes in distribution that occur at treeline for specific chironomid taxa suggest that subfossil chironomid analysis may be used to infer past changes in the position of treeline.