Arctosa cinerea

Abstract: Summary Collecting trips on Grand Canaria from 1990 to 2002 yielded eight lycosid species from five genera: Alopecosa artenarensis, Alopecosa grancanariensis, Alopecosa thaleri, Arctosa lacustris, Arctosa similis, Hogna ferox, Pardosa proxima and Wadicosa fidelis. One species was recorded for the first time from Gran Canaria: W. fidelis. The results of this study differ from previous lists of the lycosid fauna in the literature. For example, the species Alopecosa obscura, Hogna canariana and Trochosa lucasi were not found during our collecting trips. The H. canariana and Arctosa cinerea of previous studies have presumably been misidentified.

Abstract: New records are presented for a number of species recently discovered in Central Norway. Caviphantes savetorum (Hull, 1916) (Linyphiidae) and Arctosa stigmosa (Thorell, 1875) (Lycosidae) are new to Fennoscandia while Singa nitidula C. L. Koch, 1844 (Araneidae) and Myrmarachne formicaria (De Geer, 1778) (Salticidae) are new to Norway. Three rare araneids, Araneus nordmanni (Thorell, 1870), Araneus saevus L. Koch, 1872 and Gibbaranea omoeda (Thorell, 1870), have not been recorded from Norway for almost 100 years. The northernmost records in Europe of Anyphaena accentuata (Walckenaer, 1802) (Anyphaenidae), Micaria subopaca Westring, 186 1 (Gnaphosidae), Troxochrus nasutus Schenkel, 1925 (Linyphiidae), Tegenaria atrica C. L. Koch, 1843 (Agelenidae) and Dipoena towa (Thorell, 1875) are also given as well as new distributional data on Arctosa cinerea (Fabricius, 1777) (Lycosidae).

Abstract: Beaches are often intensively used by tourists that compete with the area demands of specialised species In order to estimate the area demand of beach spiders, home range, distribution and population dynamics of three species of Lycosidae (Arctosa cinerea, Arctosa perita and Pardosa agricola) were observed by mark-recapture experiments at two closed nature conservation beach areas at the Baltic Sea Results revealed that the home range size of A cinerea varied between beaches The size of minimal complex polygons of males at a narrow sandy beach was 14318 ± 2262 m2 (females: 16470 ± 1348 m2) and was so significantly smaller than those found at a broader beach (males: 18260 ± 1346 m2; females: 17936 ± 4789 m2) with about 12 % stone coverage General distribution of all spiders showed an increased frequency on the upper beach area Estimates on the population size of the three species during summer revealed the highest population size in May and the least at the end of July In addition, movement behaviour of A cinerea was observed at a nature conservation area and at an accessible beach Direct observations of movement patterns indicated that disturbed spiders take more detours and focus their movements seaward where they will be confronted with non-suitable conditions This study underlines the sensitivity of predatory arthropods of beach habitats to human disturbance This is particularly critical for the upper beach area Based on these results, means of achieving viable arthropod populations through adjusted beach management are derived