Arachnologische Mitteilungen, Heft 21 (2001)
Refine
Year of publication
- 2001 (6)
Document Type
- Article (6) (remove)
Has Fulltext
- yes (6)
Is part of the Bibliography
- no (6)
Erigonoplus justus ist eine der seltensten Zwergspinnen von Mitteleuropa. Die Art wurde von CAMBRIDGE (1875) nach einem vom Altmeister der Arachnologen E. SIMON (1848-1924) in NE-Frankreich gesammelten Männchen beschrieben und unseres Wissens seither nur dreimal wiedergefunden. So ist der überraschende Nachweis in Rheinland-Pfalz sehr willkommen, erlaubt er doch, erstmals das Weibchen der Art vorzustellen. E. justus ist neu für Deutschland.
Species richness of spiders of the floor surface and the lower trunk area is higher in beech stands than in spruce forests. The abundances of epigeic spiders are also higher in beech stands whereas trunk spiders are more active on spruce. Harvestmen generally seem to prefer spruce forests, but more species were found on beech trunks than on spruce. Beech stands are partly preferred by other species than spruce forests.
Quantitative, time-limited samplings in monthly intervals from June 1995 to August 1996, in combination with the measurement of carapace width of juvenile and adult spiders has revealed the life cycle patterns of the riparian wolf spiders Pardosa wagleri and Pirata knorri and showed the effect of floods on their abundance at the Isar River (Germany, Bavaria). Adults and juvenile spiders are heavily affected by floods but the populations of both species are able to recover quickly. The life cycles of both species are synchronized with the season and display a spring/summer stenochrony. P. wagleri shows a second reproductive phase in early summer. This reproductive behaviour supports the persistence of populations in this disturbed environment.