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Schreibt man etwas über einen bedeutenden Forscher, so stehen im allgemeinen seine wissenschaftlichen Verdienste im Mittelpunkt; lange Publikationslisten, besondere Beiträge, die zu einem bedeutenden Fortschritt im entsprechenden Wissensgebiet geführt haben, werden „abgearbeitet“. Wer den wissenschaftlichen Verdienst von Joachim Haupt (* 13. Januar 1942, † 30. April 2013) bemessen will, der schaue nur in so bedeutende Bücher wie „den Foelix“ (Biologie der Spinnen), die „Neurobiology of arachnids“ oder die „Ecophysiology of spiders“ (Foelix 1992, Barth 1985, Nentwig 1987) – in allen ist Joachim Haupt zitiert, im Überblickswerk über unsere – und seine! – Lieblingstiere ebenso wie in den Spezialwerken.
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 sterns 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 only 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 occurrence of D. torva is a result of certain biotic and abiotic factors such as the abundance of ants, the understorey and structural factors.
It has been widely accepted that the biology of Drapetisca socialis includes a pronounced stratum change of this species from the forest soil into the crowns of beech trees. On old pine trees, however, D. socialis never exceeded its activity range to heights greater than 10 metres. These results lead to an re-examination of existing results, and to a review of several studies on tree-dwelling spiders. A synopsis of all data revealed that D. socialis changes stratum along stems of trees into greater heights in forests, but only very seldom, and then obviously only by chance, reaches high tree crowns. Earlier results of a stratum change into the crowns of old beech are only assumptions. The requirement for studies including samples from the bottom to the top of trees is proposed.