Description: Das Projekt "Langzeitbeobachtungen zur Populationsdynamik des Halsbandlemmings in NO Grönland (Karupelv Valley Project)" wird/wurde gefördert durch: Deutsche Forschungsgemeinschaft. Es wird/wurde ausgeführt durch: Universität Freiburg, Institut für Geo- und Umweltnaturwissenschaften, Professur für Landespflege.Seit 1988 befasst sich das am Institut fuer Landespflege angesiedelte Langzeitforschungsvorhaben 'Karupelv Valley Projekt' mit den Ursachen der Populationszyklen von Lemmingen. Das Untersuchungsgebiet in Nordost Groenland ist Bestandteil der High Arctic Tundra und zeichnet sich durch eine einfach strukturierte Tiergemeinschaft aus. Durch jaehrliche flaechendeckende Bestandsaufnahmen und die Erfassung von Lemmingwinternestern auf einer Untersuchungsflaeche von ca 1000 ha werden sowohl die Populationsfluktuationen der Lemminge als auch die ihrer Raubfeinde dokumentiert. Die bisherigen Ergebnisse deuten auf eine verzoegerte dichteabhaengige Reaktion der Hermeline auf die Lemmingausbrueche hin. Dieser Hypothese soll nun durch Einsatz von Telemetrie im Rahmen des naechsten Zyklus naeher geprueft werden. An dem internationalen Projekt sind auch die Universitaeten Helsinki, Stockholm und Kopenhagen beteiligt.
Types:
SupportProgram
Origins:
/Bund/UBA/UFORDAT
Tags:
Freiburg
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Nagetier
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Populationsdynamik
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Grönland
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Stockholm
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Helsinki
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Kopenhagen
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Landespflege
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Tierverhalten
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Hermelin
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Tiergesellschaft
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Telemetrie
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Räuber-Beute-Beziehung
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Arktis
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Langzeitbeobachtung
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Tundra
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Bestandsaufnahme
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Ökosystemforschung
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Lemming
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Region:
Baden-Württemberg
Bounding boxes:
9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Organisations
Time ranges:
1988-01-01 - 2025-06-24
Alternatives
-
Language: Englisch/English
Title: Karupelv Valley Project - A long term study on lemming cycles in the North East Greenland National Park
Description: Initiated in 1988, this project primarily aims at a monitoring of a lemming population in a simplified high arctic ecosystem. Such long term data are regarded as a prerequisite to any realistic approach to understanding microtine cycles. The study site encompasses the coastal lowlands of Karupelv Valley on Traill Island in North East Greenland. It is located at approximately 72°30' north and 24° west, and is part of the North East Greenland National Park that provides freedom from human disturbance. Vegetation belongs to the northern tundra and is discontinuous, with great parts of the area that are barren. The selection of this area was mainly governed by the fact that it supports one of the most simple communities in existence in which lemmings occur, collared lemming (Dicrostonyx groenlandicus) being the only microtine present in this part of Greenland. It is the staple prey of a very limited number of predators. These include stoats and arctic foxes among the mammals present year-round and snowy owls as well as long tailed skuas that are present only on a seasonal basis. As in any long term study, routine surveys had to be designed simply, with samplings easy to operate. The basic approach adopted is a systematic recording of winter nests that are easy to detect and monitor following snow melt. By applying this systematic search on a greater area (1000 ha), a relative merit of this method is that it provides also more data during so called lemming lows, when other methods like trapping fail to produce enough observations. In addition, one may trace the use of the nests for subnivean reproduction (pellets of juveniles) as well as whether it was taken over by a stoat (lining with fur, scats of stoats). Field work done on a yearly basis is concentrated on the snow free period. Besides these winter nest surveys, additional data collected consist in the record of patterns displayed by predators. These includes mapping of breeding among avian predators (snowy owls, long tailed skuas) as well as the checking of occupancy of fox dens. Breeding of migratory birds (barnacle geese, waders, etc.) is also assessed on a yearly basis. Some follow up studies that specifically document patterns in summer time are also conducted in this study site (for example study on Arctic foxes). These investigations often involve close co-operation with other institutions, such as Olivier Gilg's modelling approach performed as PhD project under the auspices of the Universities of Helsinki and Montpellier). This long term monitoring of lemming abundance in Karupelv Valley has evidenced the reality of the cycling fluctuations in North East Greenland, with up to 30-fold differences in absolute number of winter nests between outbreaks and deep depressions (nearly 4000 nests in peak phases against only around 100 in depressions). The observations of now 3 cycles suggest that the length of the cycle may be 4 or 5 years, but several patterns may depart from (abridged text)
https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=60768
Status
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