Parcs

ID	TITEL	DATENTYP	AUTOR	JAHR
27622	Bibliographie NPHT	Project	Nationalparkrat Hohe Tauern	2013

Bemerkungen/Beschreibung

Bonner zoologische Beiträge <Bonn>, 54(4): p 239-245
In the last decades a significant retreat of alpine glaciers Occurred. During these processes, some pieces of peat bogs melted Out from below the glaciers. In this article, Conclusions are discussed, which call be inferred from the Chrysomelidae fragments found in these pieces. The first site is Situated at Unteraar glacier in the Central Alps of Switzerland. The pieces of peat bogs are 3600 to 3800 years old and contained more than 5000 insect fragments. The Donaciinae remains showed a typical assemblage of a Cyperaceae fell peat. They contributed to a detailed assessment of the ecological conditions at this site 3600 years ago. From below the Pasterze glacier, northeast of Grossglockner in Hohe Tauern, Austria, also pieces of peat bogs melted out. In the 8100 years old pieces, fragments of Chrysomelidae were found, which could be identified as Oreina cacaliae (Chrysomelinae). In the same pieces of peat bogs pollen of Senecio Was found, too. With the Oreina fragments it was possible to narrow down the assignment to Senecio fuchsii, because Oreina cacaliae feeds only oil this species of Senecio. But also interesting conclusions can be inferred concerning the postglacial resettlement. Oreina cacaliae has low dispersal ability. It persisted during maximum glacial extension in refugia far from its actual habitats, but managed to reach such a far site as the Pasterze 8 100 years ago. This observation is contradictive to the theory of the "unfinished postglacial resettlement" due to lack of time. Other reasons for the restriction of the range of some species, which did not resettle obviously adequate habitats in the postglacial period, have to be discussed.

Eintrag Nr. 13224

Frozen chrysomelids from alpine glaciers : witnesses of the postglacial resettlement