The night migration complex in the bottom zone of the shallow-water slope on the east coast of southern Lake Baikal near the village of Kluevka was investigated. According to the observations, it was established that the pelagic fish of the suborder Cottoidei and the pelagic amphipod Macrohectopus branickii can sporadically participate in the migration complex. The mass presence of benthic amphipods was highest in the first minute of observations, with more than 250 individuals/freeze-frame, and then stabilized at 43-65 individuals/freeze-frame. The Juday net-collected amphipods comprised only one typically benthic species, Micruropus wohlii platycercus, which is known to be a nocturnal migrant. For the first time, the typically pelagic species M. branickii, was observed in the migratory complex over shallow coastal shoal, which species, according to all previous studies, was considered to inhabit only greater depths and to avoid areas with depths of less than 100 m, such as shallow-water slope bottom zones.
D. Yu. Karnaukhov, D. Yu. Karnaukhov, D. S. Bedulina, D. Yu. Karnaukhov, D. S. Bedulina, A. Kaus, D. Yu. Karnaukhov, D. S. Bedulina, A. Kaus, S. O. Prokosov, D. Yu. Karnaukhov, D. S. Bedulina, A. Kaus, S. O. Prokosov, L. Sartoris, D. Yu. Karnaukhov, D. S. Bedulina, A. Kaus, S. O. Prokosov, L. Sartoris, M. A. Timofeyev, D. Yu. Karnaukhov, D. S. Bedulina, A. Kaus, S. O. Prokosov, L. Sartoris, M. A. Timofeyev and V. V. Takhteev
F. Chen, Y-J. Yuan, W-S. Wei, T-W. Zhang, H-M. Shang, Z-A. Fan, S-L. Yu, R-B. Zhang, Li Qin and Huiqin Wang
Siberian larch (Larix sibirica) trees were studied in a drought-stressed, lowe-levation Taiga forest in the Altay Mountains for their potential to be used for reconstructing precipitation. A climate/growth analysis provided evidence that the tree-ring widths were strongly determined by the climatic conditions from May to July, positively by precipitation and negatively by temperature. Nevertheless, the resulting regional tree-ring chronology of Siberian larch offers only a limited possibility to perform reliable reconstructions of precipitation as only 30.8% of the total variation of the actual April–July precipitation was explainable. Drought events reflected by the chronology were compared with historical records and other tree-ring derived climate reconstructions, showing some common events of climate extremes over much of Central Asia. This new Siberian larch chronology and an earlier maximum latewood density (MXD) chronology from the neighboring region reveal that the local climate is mainly characterized by cold/wet and warm/dry situations over the past 251 years. This study demonstrates that the use of both tree-ring width and MXD data may increase information of past climate variability in the Altay mountain region.