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Individual records of Phalangium opilio on the experimental tower diminished logarithmically during the experiment.
Source publication
Phalangium opilio is the most widespread and one of the most common harvestman species in anthropogenic environments. A preliminary field experiment was carried out in Slovenia testing its preferences for different substrates. A two metres high rectangular tower with walls constituted of vertical bands of concrete, twice fired tile, wood and styrof...
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Phalangium opilio is the most widespread and one of the most common harvestman species in anthropogenic environments. A preliminary field experiment was carried out in Slovenia testing its preferences for different substrates. A two metres high rectangular tower with walls constituted of vertical bands of concrete, twice fired tile, wood and styrof...
Citations
... Phalangium opilio is found throughout much of the Holarctic region as well as New Zealand Butcher et al. 1988) and Japan Tsurusaki and Takenaka 2010). Phalangium opilio is now the most widely distributed species of harvestmen in the world (Novak et al. 2009). It was first recorded in North America as Phalangium longipalpus Weed 1890 and later as P. opilio and Opilio angulatichelis Roewer 1952 (see below under Opilio). ...
... Despite rather significant morphological differences between limestone and igneous caves, prior to this study no patterns have been observed between bedrock of the study area and the species composition of trogloditic arthropods (Caccone, 1985;Howarth, 1996a). However, arachnids have been known to show substrate preference in epigean habitats (Prendini, 2001;Kraus and Morse, 2005;Novak et al., 2009). Furthermore, difference in patterns of rainfall and forest cover may contribute to the distribution of these lineages, but more detailed sampling is necessary to assess these ideas. ...
Distribution of synanthropic and expansive harvestmen species: Lacinius dentiger, Leiobunum limbatum, Nelima sempronii, Opilio canestrinii, Opilio parietinus, Opilio saxatilis and Phalangium opilio in the Polish Carpathians was investigated and illustrated. The actual routes of migration and the possible threats as well as the changes that have taken place as a result of the emergence of invasive harvestmen species are also discussed.
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 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.
