Spiders (Araneae) on sandy islands in the southwestern archipelago of Finland

Spiders were studied on two sandy islands in the outermost part of the SW archipelago of Finland. Korppoo Jurmo (59 degrees 50'N, 21 degrees 37'E) and Dragsfjard Oro (59 degrees 50'N, 22 degrees 20'E). The main collecting method was pitfall trapping. Typical, and often locally abundant, species an sandy and/or gravel shores were e.g. Arctosa cinerea, Alopecosa fabrilis, Pardosa agricola, Xerolycosa miniata, Zelotes longipes, Z. praeficus. Callilepis nocturna, Lasiargus hirsutus. Trichoncus hackmani, Microlinyphia impigra, Steatoda albomaculata, Philodromus fallax, Phlegra fasciata and Sitticus saltator: On dry heath meadows the following species, in addition to many of the above-mentioned spiders, were typically caught: Zelotes electus, Alopecosa cuneata, Pardosa agrestis, P. palustris, Trichopterna cite and Lepthyphantes decolor. The material included three species listed in the Finnish Red Data Book, all in need of monitoring, i.e. Zelotes electus (abundant), Metapanamomops kaestneri (locally abundant) and Acartauchenius scurrilis. Also many other rare species, like Jacksonella falconeri, Argenna subnigra and Pseudicius encarpatus, were found.