Synchrony in lemming and vole populations in the Canadian Arctic
Abstract: Population fluctuations may occur in synchrony among several rodent species at a given site, and they may occur in synchrony over large geographical areas. We summarize information on synchrony in lemmings and voles from the Canadian Arctic for the past 20 years. The most detailed availabl...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.679 http://www.zoology.ubc.ca/~krebs/papers/202.pdf |
| Summary: | Abstract: Population fluctuations may occur in synchrony among several rodent species at a given site, and they may occur in synchrony over large geographical areas. We summarize information on synchrony in lemmings and voles from the Canadian Arctic for the past 20 years. The most detailed available information is from the central Canadian Arctic, where snap-trap samples have been taken annually at several sites for periods of up to 15 years. Geographical synchrony in the same species among different sites was strong, especially for the central and eastern Canadian Arctic. Synchrony among different species at a given site was also generally high. When one species is at high density, densi-ties of all species at that site tend to be high. These results do not easily fit the mobile-predator hypothesis proposed to explain regional synchrony, and are more consistent with the weather hypothesis, which we suggest both entrains syn-chrony among sites and enforces synchrony among species within a site. We tentatively support the weather hypothesis for geographical synchrony in lemmings, and recommend the establishment of a circumpolar program to monitor lem-ming cycles and predator movements that would advance our understanding of these large-scale patterns of cyclic syn-chrony. Résumé: Les densités de plusieurs espèces de rongeurs peuvent fluctuer en même temps à un endroit donné et ces fluctuations peuvent aussi être synchrones sur une échelle géographique très grande. Nous résumons ici des informa-tions sur le synchronisme des lemmings et des campagnols dans l’arctique canadien depuis 20 ans. Les informations les plus detaillées proviennent de la région centrale de l’arctique, où des recensements annuels par trappage destructif ont été effectués à plusieurs sites pour une période allant jusqu’à 15 ans. Pour chaque espèce, le synchronisme géogra-phique entre les différents sites est très fort entre les différents sites, et plus spécialement aux sites du centre et de l’est de l’arctique canadien. De même, le ... |
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