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14. Ярошенко M.Ф., Дедю И.И, Кубрак ИФ, Зеленин АМ. Итогии перспективы акклиматизации рыб и кормовых беспозвоночных вводоемах Молдавии.// Совещание по итогам и перспективам акклиматизациирыб и беспозвоночных в водоемах СССР. Тезисы. 1965.С. 24-26.15. Ярошенко M.Ф. Гидрофауна реки Днестр. АН СССР. Москва.1957.168 с.16. Coada V., Popa V. Diversitatea malacologică fluviului Nistru оnporţiunea or. Otaci-or.Vadul-lui-Vodă. Академику Л.С. Бергу – 130 лет.Сборник научных статей. Бендеры. 2006. P.66-68.17. Kiseliova O. Population ecology and reproductive peculiaritiesof fish species with short life spans from the lower sector of the DniesterRiver. PhD thesis, Chisinau: 2009. 95 pp.18. Munjiu O, Shubernetsky I. First record of Sinanodonta woodiana(Lea, 1834) (Bivalvia: Unionidae) in Moldova.//Aquatic Invasions.Volume 3, Issue 4, 2008. P.441-44219. Munjiu O, Shubernetsky I. First record of Asian clam Corbiculafluminea (Mьller, 1774) in the Republic of Moldova.// Aquatic Invasions.Volume 5, Supplement 1, 2010, P.67-70.20. Son M.O. Invasive mollusks in fresh and brackish waters ofNorthern Black sea Region. Odessa. 2007a. 132p.21. Son M.O. North American fresh water limpet Ferrissia fragilis(Tryon, 1863) (Gastropoda: Planorbidae) – a cryptic invader in theNorthern Black Sea Region. Aquatic Invasions V.2 2007b. Р.55-58.22. Toderaş I.Ch., Reva V.A., Chiroşca V.V. Polimorfismul moluştelorgenului Dreissena (Mollusca, Bivalvia), din bazinul hidrografic al fluviuluiNistru.//Buletinul Acad. de Şt. a Moldovei. N1(298). Chişinău. 2006.P.134-138.23. Toderash I., Vladimirov M. Aspectul structural-cantitativ aicomunităţilor zoobentonice a ecosistemelor acvatice din bazinulhidrografic al râului Prut.// Академику Л.С. Бергу – 130 лет. Сборникнаучных статей. Бендеры. 2006.P.134-137.Evolution of shrew (Mammalia, Soricomorpha, Soricidae) communitiesin Republic of Moldova in the last decadesV. Nistreanu, A. Savin, A. Larion, N. Corcimaru, V. Burlacu*, N. CaramanInstitute of Zoology, Academy of Sciences of Moldova, vicnistreanu@gmail.com* – National Scientific-Practical Centre of Preventive MedicineThe shrews are the smallest mammals of the worldfauna and represent a wide spread group of animals inthe ecosystems of Moldova. At the same time they areof great importance in natural environment and in humaneconomy, being important link within the animal trophicchain. Six shrew species inhabit in Moldova: commonshrew (Sorex araneus), pygmy shrew (S. minutus),bicolored shrew (Crocidura leucodon), lesser shrew (C.suaveolens) and Mediterranean water shrew (Neomysanomalus).In the XXth century in our republic this group was ratherpoor studied by comparing with other mammals. Dataconcerning the shrews can be found in the monograph“Animal world of Moldova” in “Mammals” volume (Lozan,1979) and in some other papers, where shrew speciesare mentioned (Averin et al., 1984; Munteanu & Savin,1990). The most serious work concerning the insectivorespecies in Moldova was published by Lozan (1975), wherecan be found data on morphology, ecology, palaeontologyand spreading of shrews on the territory of Moldova.After 2000 this group of mammals is intensely studied.Some data on shrew biology can be found in “Animalworld of Moldova” in “Mammals” volume (Munteanu &Lozan, 2004), as well as in several papers where shrewspecies are mentioned as components of small mammalcommunities in various types of ecosystems (Munteanu,2005; Tikhonov et al., 2009 a, b; Tikhonova et al., 2009).In the last several years shrew species were studiesmore detailed from morphological, zoogeographical andecological point of view (Nistreanu, 2007, 2008; Nistreanuet al, 2008, 2009 a, b). The paper contains some dataconcerning the evolution of shrew communities in the lastseveral decades on the territory of Moldova.Materials and methodsThe paper is based on the material collected in thepast century by the researchers of Laboratory of MammalEcology, which is kept in the laboratory collection, as wellas on the existing published and non-published data.The information of the last 5 years regarding the shrewspecies is based on the studies of the authors on thewhole territory of Moldova.Shrews were caught with snap traps and fall trapsin various types of ecosystems in the northern, centraland southern parts of the republic. The animals weremeasured, weight, the sex, age and reproductivestatus were determined, the skull were preserved forfurther morphological studies. The following indexeswere considered: trappability, relative abundance,frequency.Results and discussionsIn the last years some considerable modification ofshrew communities in various types of ecosystems on thewhole territory of Moldova were registered by comparingwith the situation from the past century.In the 1970’s the dominant species among shrewsin natural ecosystems was S. araneus, followed by N.anomalus. The species S. minutus and C. suaveolenswere rather spread on the republic territory, but had lowabundance, while C. leucodon was registered only infew natural ecosystems with very low abundance (fig.1). The proportion of common shrew among other shrewspecies was the highest in forest ecosystems (insularforests in the northern part, central forest, forest shelterbelts), in meadows of Nistru and Prut rivers, in wet biotpesnear woods. In insular woods from the northern part thecommon shrew constituted about 5-16% from all thesmall mammals, in wet oak forests with well developedshrub and herbaceous vegetation its abundancereached 20%, while in lower Prut marshes this speciesconstituted up to 55% from all the small mammals(Lozan, 1975, 1979). In the southern part of the republicin steppe zone this species was very rare. In agriculturalecosystems, such as old orchards, forest shelter beltsthe density of the common shrew was rather low (3-4individuals per 100 traps). The trappability index of thespecies was between 3% and 12% depending on thebiotope (Lozan, 1975). The Mediterranean water shrewwas also rather spread, but mostly in wet biotopes, nearvarious water sources. It abundance in such biotopesreached about 30% from all the shrews. Together withthe common shrew it constituted about 80% from theshrew population of the republic (fig. 1). The white-— 148 —