Beitrag zur Kenntnis der Branchiopoden‐ und Copepodenfauna der Mongolei

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Abstract
Contribution to the Knowledge of the Branchiopod and Copepod Fauna of MongoliaOne species of Anostraca, 25 species of Cladocera and 19 species of Copepoda are reported, mainly from the eastern Khangai mountains, the Tola valley near Ulan‐Bator, and the Khentei mountains. One subspecies, Arctodiaptomus rectispinosus mongolicus, is new to science. An important fraction of species in the present collection had not yet been recorded from Mongolia. The relations between Daphnia longispina O. F. MÜLLER, 1785 and Daphnia rosea SARS,1862,Simocephalus vetulus (O. F. MÜLLER, 1776) and Simocephalus vetuloides SARS, 1898 are discussed. Due to hydrochemical factors, to trophic and climatic conditions most of the sampled localities can be divided into two groups: those of the mountainous steppe zone with high contents of nutrients and electrolytes and those situated in the northern montainous forest steppe zone which are more or less acidic and poor in nutrients and electrolytes. This is also reflected by the fauna composition.