Genus

Free-living predatory mesostigmatid soil mites from five different forests from the Danube Delta Biosphere Reserve (DDBR) were analyzed in order to get information for defining the conservation status of the investigated sites. On the whole, in the five studied sites 32 species of Mesostigmata belonging to 22 genera and 11 families were recorded. The analyzed material includes new species of Romanian fauna as well as rare and less cited species from Romania. A quarter of the identified species were formerly found in the Danube Delta, two species being identified only within DDBR territory. The particular conditions of each stand (vegetation, type of soil etc.) as well as climatic conditions influence both the quantitative and qualitative aspects of the structure of the mesostigmatid mites communities. Horizontal and vertical distributions and the aspects of demographic structure are discussed and the degree of similarity of the gamasid mite communities from the five sites were analyzed on the basis of specific composition and quantitative parameters.

This paper presents the results of a comparative study on the major groups of mites associated with ants in two different areas (hilly and mountain) of the Argeș basin. Mites from order Gamasida (Suborders Uropodina and Gamasina) and order Oribatida, and the ant fauna (Order Hymenoptera, family Formicidae) were investigated. Out of 31 mite species identified, Oplitis hutae is new to science (Constantinescu, in press), five are recorded for the first time in the Romanian fauna, and two for the second time. Also, one of the host ant species, Lasius sabularum is recorded for the second time in the Romanian myrmecofauna. In addition to the faunistic synopsis, a brief ecological and zoogeographical characterization is presented.Résumé. L'article présente les résultats d'une étude comparative sur les principaux groupes d'acariens associés aux fourmis, dans deux zones différents (collines et montagnes) du bassin d'Argeş. Les acariens de l'Ordre Gamasida (Sousordres Uropodina et Gamasina) et de l'Ordre Oribatida, et la faune des fourmis (Ordre Hymenoptera, Famille Formicidae) ont été étudiés. Parmi les 31 espèces d'acariens identifiées, Oplitis hutae est nouvelle pour la science (Constantinescu, sous presse), cinq sont enregistrées pour la première fois dans la faune de Roumanie et deux autres espèces pour la deuxième fois. Aussi, l'une des espèces de fourmis hôte, Lasius sabularum est enregistrée pour la deuxième fois dans le myrmécofaune de Roumanie. En plus de la synthèse faunistique, une brève caractérisation écologique et zoogéographique a été réalisée.

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