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Two inventories of amphibian breeding sites from the years 1978/79 and 1991/92 have provided a rich source of data on spadai distribution and population sizes. Several endangered amphibian species in the canton of Aargau show an alarming decline. It is evident that efforts to protect the breeding sites or to create new sites have been insufficient to compensate for the loss of habitats.

In the canton of Aargau (Northern Switzerland) an inventory of amphibian breeding sites, covering the whole territory, has been made in 1978/79. Altogether 918 waters were entered on a map, amongst them 94 brooks. The same inventory was repeated In 1991192 by much more collaborators who ascertained the amphibian stocks of 2267 waters, 919 of them being brooks. A comparison of the two inventories shows that in the time between 111 sites were destroyed and 141 spoilt, while 656 grounds remained unchanged and 331 new sites were created.

Cet ouvrage présente la distribution et l'écologie générale de toutes les espèces de Mollusques aquatiques et terrestres découvertes en Suisse, depuis le Quaternaire. Depuis la parution du catalogue des Gastéropodes de la Suisse (Mermod 1930) aucune synthèse des connaissances malacologiques rassemblées dans ce pays a été publiée. Cet atlas est donc un outil important pour ceux qui désirent étudier et protéger ces organismes et leurs habitats.

Einleitung, Morphologische Merkmale, Biologie, Paarung und Entwicklung, Fang und Konservierung, Bestimmungsschlüssel für die Gattungen, Literatur, Systematische Übersicht und Verbreitung