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The bug species Insecta Heteroptera of the peat-bogs of the Canton Ticino and the Moesano Calanca and Mesolcina - GR, Switzerland Gli eterotti Insecta Heteroptera delle torbiere a sfagni del Cantone Ticino e del Moesano Val Calanca e Val Mesolcina - GR, Svizzera

, : The bug species Insecta Heteroptera of the peat-bogs of the Canton Ticino and the Moesano Calanca and Mesolcina - GR, Switzerland Gli eterotti Insecta Heteroptera delle torbiere a sfagni del Cantone Ticino e del Moesano Val Calanca e Val Mesolcina - GR, Svizzera. Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 703-4: 419-439

During the period 1990-1993 an ecological and faunistical study of several groups of arthropods was carried out using different sampling methods at 20 sites (peat-bogs of different typology and their contact zone) in the southern Swiss Alps (Ticino, Grisons) at altitudes between 275 and 2020 m a.s.l. One hundred and five species of Heteroptera (12 aquatic and 93 terrestrial) were recorded, 3 of which (Halticus pusillus, Aradus crenaticollis, Scolopostethus cognatus) are new for the Swiss fauna and 23 are new for the Canton Ticino. Results show that the richness of bug species of the investigated peat-bogs decrease significantly at increasing altitude and that the bug communities are principally composed of eurytopic and tyrphoxenic species, which penetrate from the surrounding aera. Characteristic species are represented by Gerris gibbifer (acidophilic), Hebrus ruficeps, H. pusillus and particularly Lygirocoris silvestris, which shows high preference for Sphagnum habitats and was frequently recorded between 965 and 2020 m a.s.l. The tyrphophilic species Agramma ruficorne and Notonecta obliqua, which were recorded in the past in the Canton Ticino, could not be found. The striking dearth of characteristic species (tyrphobionta and tyrphophilia) and the richness of eurytopic and tyrphoxenic species is explained by biogeographical (southern margin of the area of many peat-bogs species), topographical (small dimensions and great isolation of the biotopes) and ecological reasons (bad state of preservation of the biotopes).


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