Heft 13 (1997)
Die epigäische Spinnenzönose (Araneae) auf Schotterbänken der Mittelgebirgsbäche und -flüsse im Rheinischen Schiefergebirge
Spider community (Araneae) of gravel bars along streams in lower mountainous areas (Rheinisches Schiefergrbirge, Northern Hesse, Germany)
Araneae; gravel bar; small streams; Hesse; Germany
Abstract
The spider communities on gravel bars along streams in lower montainous areas of Northern Hess were investigated. Eight streams differently altered by human impact were studied: four small streams without weirs and impoundments, two regulated small streams and two larger regulated streams. The sampling sites were located in one kilometer streches of the upper, middle and lower reach of each small stream, respectively. In addition the gravel bars in several floodplain sections of larger streams were investigated. Altogether 592 quantitative samples of spiders were made. 7027 spiders (Araneae) comprising 77 species were encountered. Only two species (Oedothorax agrestis, Pirata knorri) make up more than 70 percent of all spiders captured. Erigone atra and Erigone dentipalpis were frequently foung along all streams investigated. While Diplocephalus permixtus and Diplocephalus protuberans were only encountered along the small streams, Oedothorax retusus and Pardosa amentata were predominantly recorded on gravelbars of large streams. Diplocephalus protuberans was recorded for the first time in Hesse. The mean abundances (median) ranged between 4 and 28 individuals/m2. 198 individuals/m2 have been the maximum of abundance.
On the biology of Dipoena torva (Araneae: Theridiidae)
Zur Biology von Dipoena torva (Araneae: Theridiidae)
Dipoena torva; life history; stratification; pine trees; oaks; Berlin; Germany
Abstract
Data are given concerning stratification, phenology, feeding and mating behaviour of the theridiid spider Dipoena torva (THORELL, 1875). The species was found predominantly at heights of around 10 metres on the stems of oaks and pines in Berlin, Germany. The sex ratio was more or less 1:1. Adult spiders were active during summer whereas juveniles were onliy found before and after the main activity period of adults. This species seems to be active during the daytime. The main food consists of ants. The mating behaviour is described. The occurence of D. torva is a result of certain biotic and abiotic factors such as the abundance of ants, the understorey and structural factors.
Eine bemerkenswerte Beobachtung zur physikalischen Netz-Eigenschaft der Gattung Eresus Walckenaer 1805 (Araneae: Eresidae), gewonnen bei einem Versuch zur Protein-Sequenzierung von Spinnenseide.
A remarkable observation of physical quality of the webs from the genus Eresus Walckenaer, 1805 (Araneae: Eresidae)
spider; web consistance#
Volker Hugenschütt (1997): Bioindikationsanalyse von Uferzonationskomplexen der Spinnen- und Laufkäfergemeinschaften (Arach.: Araneae, Col.: Carabidae) an Fließgewässern im Drachenfelser Ländchen
Volker Hugenschütt (1997): Bioindikationsanalyse von Uferzonationskomplexen der Spinnen- und Laufkäfergemeinschaften (Arach.: Araneae, Col.: Carabidae) an Fließgewässern im Drachenfelser Ländchen
book review
Abstract
book review: Volker Hugenschütt (1997): Bioindikationsanalyse von Uferzonationskomplexen der Spinnen- und Laufkäfergemeinschaften (Arach.: Araneae, Col.: Carabidae) an Fließgewässern im Drachenfelser Ländchen
K.G. Mikhailov: Catalogue of the spiders of the territories of the former Sovjet Union (Arachnida, Aranei)
K.G. Mikhailov: Catalogue of the spiders of the territories of the former Sovjet Union (Arachnida, Aranei)
book review
Abstract
book review: K.G. Mikhailov: Catalogue of the spiders of the territories of the former Sovjet Union (Arachnida, Aranei)