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EN
The aim of the study was to conduct quantitative and qualitative analysis of epigeic arthropods (Carabidae, Staphylinidae, Arachnida) occurring in crops within "Norfolk" rotation in organic farming. Arthropods’ collecting was carried out in 2014 at the Experimental Research Station Swojec of the Wrocław University of Environmental and Life Sciences and at the organic farm located at Kamieniec Wrocławski. In both locations ground beetles, rove beetles and arachnids were the most numerous arthropods. The highest number of ground beetles was found within oat treatment, while rove beetles and arachnids within fodder peas. The greatest diversity of ground beetles species was calculated in Kamieniec Wrocławski, in case of pea crops. It may be assumed that these crops, provided by organic farming method, are optimal habitat for beneficial epigeal arthropods development.
PL
Celem pracy była analiza ilościowa i jakościowa zgrupowań stawonogów epigeicznych (Carabidae, Staphylinidae, Arachnida) występujących w uprawach płodozmianu norfolskiego, prowadzonych metoda ekologiczna. Odłowy stawonogów do pułapek glebowych prowadzono w 2014 roku, w Rolniczym Zakładzie Doświadczalnym Swojec, należącym do Uniwersytetu Przyrodniczego we Wrocławiu oraz w gospodarstwie ekologicznym w Kamieńcu Wrocławskim. W obu miejscowościach najliczniejsza grupa stawonogów były chrząszcze z rodzin biegaczowatych i kusakowatych oraz pajęczaki. Liczebność biegaczy najwyższa była w uprawie owsa, natomiast kusaków i pajęczaków najwięcej odłowiono w uprawie grochu pastewnego. Najwieksze zróżnicowanie gatunkowe biegaczowatych odnotowano w Kamieńcu Wrocławskim w uprawie peluszki. Można przypuszczać, że wymienione uprawy prowadzone metodą ekologiczną stanowią optymalne siedlisko dla rozwoju pożytecznych stawonogów naziemnych.
EN
The impact of grazing has been discussed in many organisms, and it has been shown that it has considerable influence on the structural variation of vegetation, resulting in its tussocky appearance. Such spatial heterogeneity results in plants formations that facilitate other species by providing safe sites against predation and physical stress. On the Trnovski gozd plateau in western Slovenia, a secondary habitat of the rare, monotypic endemic umbelliferous species, Hladnikia pastinacifolia, was colonized by a relatively isolated population of the wide spread opilionid species, Phalangium opilio. We hypothesized that in this stony pasture, the impact of the structurally heterogenous vegetation that results from low-intensity grazing benefits both species on hot summer days. For this purpose, we classified vegetation formation types (VFT) and measured temperature and relative humidity in places settled by Ph. opilio individuals during their daily rest. According to the predominant species, we recognized six VFTs: Carlina acaulis, Ruta divaricata, Koeleria pyramidata, Juniperus communis, understory vegetation and grazed turf. Only the spiny C. acaulis and unpalatable R. divaricata facilitated H. pastinacifolia, while also acting as nurse plants. On the other hand, Ph. opilio preferred the understory, but also settled on the other VFts, except Ruta. During the highest daily temperature of about 38[degrees]C, Ph. opilio avoided the grazed turf. Temperature preferences refer to frequencies of individuals rather than to absolute temperature values. The frequencies were independent of sex and the VFTs. Females were more frequently found in tussocks showing higher temperature profiles (Juniperus, Koeleria). During the hot daytime, Ph. opilio was most sensitive to relative humidity, and less so to temperature, whilst the height of settlement varied in adjusting these two environmental factors. The distribution of males significantly differed between the subsequent morning, midday and evening series, but not between the morning and evening ones, while in females it differed between all the three time series. In habitats, such as stony dry pastures, low grazing intensity can maintain persistent populations of H. pastinacifolia and Ph. opilio even in extremely hot weather. Such grazing is the most convenient measure for protecting both species, especially the highly endangered Hladnikia. The major threat to such habitats is afforestation by Pinus nigra, which deserves additional management. We found that in stony pastures, low grazing intensity assures the structural heterogeneity of vegetation required to maintain persistent populations, of both H. pastinacifolia and Ph. opilio.
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