Arachnologische Mitteilungen
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Erstnachweis von Pseudomaro aenigmaticus (Araneae: Linyphiidae) und weitere Funde von Philodromus praedatus (Araneae: Philodromidae) in der Schweiz
First record of Pseudomaro aeigmaticus (Araneae: Linyphiidae) and further records of Philodromus praedatus (Araneae: Philodromidae) in Switzerland
Spinnenaufsammlungen aus Ostösterreich mit vier Erstnachweisen für Österreich
Spider collections from Eastern Austria with four first records for Austria
Araneae; faunistics; taxonomy; Austria; first records
Abstract
95 species of spiders are reported, which were collected by hand and sweep-net during an excursion to Lower Austria and Burgenland in June 1993. New for Austria are: Larinia bonneti SPASSKY, 1939, Philodromus buddenbrocki BRAUN, 1965, Philodromus pulchellus LUCAS, 1946 and Tmarus stellio SIMON, 1875. Taxonomic characters of the last three species are documented.
Ernährungsbiologie und Nahrungsspektrum der Gerandeten Jagdspinne Dolomedes fimbriatus (Araneae: Pisauridae)
Feeding biology and prey of Dolomedes fimbriatus (Araneae: Pisauridae)
fishing spider; prey; feeding-periods; prey-size; euryphagy; cannibalism
Abstract
In 369 individuals of feeding Dolomedes fimbriatus (all stages/sizes) living in moorlands of Northwestern Germany, field studies were carried out, in particular concerning relations of spider size, kind/size of prey and lurking-site as well. Findings reveal extremely variable food types, depending on seasonal fluctuations of active prey species and of lurking-sites of Dolomedes. Largest prey (relative to spider size) is not captured by the big sized preadults or adults, but by juveniles of 6-9mm length. The prey spectrum comprises also syntopical spiders and opilionids. Surprisingly cannibalism among Dolomedes individuals is rahter requent in spring and autumn and may serve to maintain the population when prey is rare.