Food web analyses of the saline Lake Chany complex in Western Siberia and the survey of the environment based on NOAA images

本文利用碳氮稳定同位素比值对俄罗斯西西伯利亚察尼湖（Chany Lake）河口两个地点的鱼类群落和浮游生物进行了食物网分析。结果表明：采集到的鱼苗流动性较低，以各测点生长的浮游动物为食，测点间包括鱼苗在内的浮游食物网存在空间分离。流动的鱼食性捕食者的迁徙使河口的食物链在空间上相互隔离。成年鲤科鱼类的同位素特征表明，尽管浮游植物在浅水和高产的Chany湖复群中起着重要的作用，但大型植物（或附生）生产通过脚底食草动物和草食/底栖鲤科动物途径被纳入食物网。我们可以得出结论，杂食性鲤科动物对复杂的滨海食物网结构做出了贡献，其中大型植物是重要的初级生产者。自然界中溶质的主要化学成分来自俄罗斯西伯利亚西部的昌尼湖和附近湖泊的更多水与现代海水相当。溶解硫酸盐具有明显的高硫同位素特征，其值可与哈萨克斯坦北部类似盐湖、咸海、巴哈什湖和阿尔泰山石膏矿床中的硫同位素特征区分。chanany盆地溶解硫酸盐的一个可能来源是继承了东部古生代的隐生岩，其中包括具有明显重硫同位素值的下寒武统地层。利用1999 ~ 2004年无冰期的NOAA卫星影像，对Chany湖复合体的湖泊面积和周围植被进行了季节变化评价。与地面数据相比，这些地区似乎受到融雪流入和芦苇生长的影响。在孤立的尤丁斯基池，8 - 10月的年际差异较大。尤丁斯基池可能受到降水和蒸发量年波动的影响。因此，尤丁斯基地区被认为对西伯利亚西南部气候敏感。少

We conducted food web analyses of fish community as well as plankton at two sites in the estuarine part of Chany Lake (West Siberia, Russia) using carbon and nitrogen stable isotope ratios. The results showed that most fish fry collected had low mobility and fed on zooplankton grew in each site, and there was a spatial separation of planitonic food webs including fish fry between the sites. Migration of mobile piscivorous predators combined the spatially segregated food chains in the estuary. Isotopic signatures of adult cyprinid fishes revealed that macrophytic (or epiphytic) production was incorporated into the food web through epifaunal grazers and the herbivorous/benthivorous cyprinid pathway, though phytoplankton played an important role in the shallow and highly productive Lake Chany complex. We can conclude that omnivorous cyprinids contribute to the complex littoral food web structure where macrophytes are a significant primary producer. The major chemistry of solutes in natura … More l waters from the Lake Chany complex and nearby lakes in western Siberia, Russia, is comparable to modern seawater. Dissolved sulfates are characterized by a markedly high sulfur isotopic signature and the values can be distinguished from those in similar saline lakes in northern Kazakhstan, the Aral Sea, Lake Barhashi, and gypsum deposits in the Altai Mountains. A possible source of the dissolved sulfates in the Lake Chany basin is the inheritance of a hidden connate from eastern Paleozoic ranges that involve Lower Cambrian formations with distinctly heavy sulfur isotope values. We evaluated the seasonal changes in the lake area and surrounding vegetation of the Lake Chany complex using NOAA satellite images of the ice-free periods from 1999 to 2004. Compared to ground-truth data, the areas seem to be influenced by the inflow of snow-melt and reed growth. At the isolated Yudinskii Pool, large interannual differences were observed from August to October. Yudinskii Pool may be affected by annual fluctuation in precipitation and evaporation. Therefore, the Yudinskii area is considered sensitive to climate of southwestern Siberia. Less