Olga V. Aksenova

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This paper continues a discussion on the number of pearl mussel species of the genus Margaritifera in northern Europe. A biometric study of 1711 pearl mussel Margaritifera margaritifera shells from 15 rivers in Russia and Latvia (basins of the White and Baltic seas) has been conducted. All the examined samples fall into two groups: the northern group (with(More)
IVAN BOLOTOV , YULIA BESPALAYA, OLGA AKSENOVA, ANDREY AKSENOV , NIKITA BOLOTOV , MIKHAIL GOFAROV , ALEXANDER KONDAKOV, INGA PALTSER & ILYA VIKHREV 1Institute of Ecological Problems of the North, the Ural Branch of Russian Academy of Sciences, Severnaya Dvina Emb. 23, 163000 Arkhangelsk, Russian Federation 2Northern (Arctic) Federal University, Severnaya(More)
The molecular techniques are the standard tool for the study of the taxonomic position and phylogenetic affinities of the lymnaeid genus Radix Montfort, 1810, and the majority of the European representatives of this taxon have been studied in this respect. However, a plethora of nominal species of Radix described from Northern Asia (Siberia and the Russian(More)
The biogeography of Iceland is controversial. Some authors believe that all Icelandic life originated after postglacial dispersal events (tabula rasa hypothesis), but others assume that some organisms survived the last glaciation in ice-free refugia. To extend existing knowledge of the freshwater biogeography of Iceland, we used a snail species, Radix(More)
The concept of long-lived (ancient) lakes has had a great influence on the development of evolutionary biogeography. According to this insight, a number of lakes on Earth have existed for several million years (e.g., Baikal and Tanganyika) and represent unique evolutionary hotspots with multiple intra-basin radiations. In contrast, rivers are usually(More)
Although a recent series of studies has examined the phylogeography and diversity of Arctic invertebrates related to the glacial history on a pan-Arctic scale, large gaps remain in the knowledge on the origin, dispersal and biogeography of freshwater mollusks in the Russian Arctic. In samples from two lakes on Vaigach Island, Arctic European Russia, we(More)
Freshwater invertebrates are able to develop specific ecological adaptations that enable them to successfully inhabit an extreme environment. We investigated the brooding bivalve of Pisidium casertanum in Talatinskoe Lake, Vaigach Island, Arctic Russia. Here, quantitative surveys were conducted, with the collection and dissections of 765 molluscs, on the(More)
Southeast Asia harbors a unique and diverse freshwater fauna of Mesozoic origin, which is under severe threat of extinction because of rapid economic development and urbanization. The largest freshwater basins of the region are certainly the primary evolutionary hotspots and they attract the most attention as key biodiversity areas for conservation. In(More)
Basic therapy of peripheral cochleovestibular disorders of vascular origin consists of the rational combination of medicamentous and non-medicamentous treatments that collectively ensure positive clinical results. The use of hirudotherapy for the management of peripheral cochleovestibular disorders resulted in the substantial decrease of ear noise and the(More)