Interpreting the lake-status record of the East Asian monsoon using a hydrological model

The East Asian monsoon (EAM) has experienced significant changes over the past 10,000 years that influenced East Asian agricultural development. However, the magnitude and extent of the EAM precipitation fluctuations at 6 ka remain unresolved, owing to uncertainty in individual lake records and substantial variations in the expansion limits in simulations of the mid-Holocene EAM precipitation. Here we present an approach based on multiple lake-level records using the “1D lake level—2D lake area—3D catchment hydrology” model to reconstruct the precipitation patterns in northern China, and to further quantify the extent of the EAM precipitation expansion in the mid-Holocene relative to today. The precipitation reconstructions suggest an ~550–1100 km northward expansion and an ~530–840 km westward migration of the EAM at 6 ka. At that time, the EAM precipitation domain covered over 6 million square kilometers. Thus, this approach mitigates the uncertainty and arbitrariness of reconstructions of the limit of the EAM precipitation fields and provides a benchmark for future climate modeling studies.

Algae Flora of the Lake Krivoye in Early XXI Century (Novosibirsk Oblast)

Outcomes of the Lake Krivoye main algal characteristic studies have been presented. The lake is located in Novosibirsk Oblast Karasuk Rayon and relates to the Karasuk River cultural landscape. There are very few easily accesible materials concerning the lake status, and the most of tham are dated back to the middle of the past century. Therefore, the lake contemporary ecological status is of special interest. Within the framework ofthis study the phytoplankton species composition and its seasonal succession have been investigated. Analysis of the qualitative development (abundance, biomass, etc.) has been performed, the role of the main algae divisions in its formation has been considered. In the process of studying sets of the main predominate species for each stage of selection has been found and the species diversity and community uniformity indices have been analysed. Such a significant indicator of the hydrocoles community morpho/functional structure as dimesional cell characteristics has been discussed. The pollution level has been assessed on the basis of the saprogenic/biological analysis data and the water quality class gas been determined.

Epiphytic chironomids on rigid hornwort (Ceratophyllum demersum L.) - the relation between the community structure and lake status

Epiphytic chironomids on rigid hornwort (Studies on the role of