CheveauDrapeauImbeauEtAl2004

Référence

Cheveau, M., Drapeau, P., Imbeau, L. and Bergeron, Y. (2004) Owl winter irruptions as an indicator of small mammal population cycles in the boreal forest of eastern North America. Oikos, 107(1):190-198.

Résumé

Contrary to what is observed in Fennoscandia, it seems to be widely accepted that small mammals do not exhibit multi-annual population cycles in the boreal forest of North America. However, in the last thirty years, irruptions of vole predators such as owls have been reported by ornithologists south of the North American boreal forest. While such southerly irruptions have been associated in Fennoscandia with periods of low abundance of small mammals within their usual distribution range, their possible cyclic nature and their relationships to fluctuations in vole densities at northern latitudes has not yet been demonstrated in North America. With information collected from existing data-bases, we examined the presence of cycles in small mammals and their main avian predators by using temporal autocorrelation analyses. Winter invasions of boreal owls (Aegolius funereus) were periodic, with a 4-yr cycle in Que?bec. Populations of one species of small mammal, the red-backed vole (Clethrionomys gapperi), fluctuated periodically in boreal forests of Que?bec (north to 48°N). Boreal owls show invasion cycles which correspond to years of low density of red-backed voles, the main food item for this owl species. In addition, winter observations of northern hawk owls (Surnia ulula) and great gray owls (Strix nebulosa) south of their usual range increased in years of low density of red-backed voles. Our results suggest that a 4-yr population cycle exists in the eastern boreal forest of North America for voles and owls, which is very similar to the one observed in Fennoscandia.

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@ARTICLE { CheveauDrapeauImbeauEtAl2004,
    AUTHOR = { Cheveau, M. and Drapeau, P. and Imbeau, L. and Bergeron, Y. },
    TITLE = { Owl winter irruptions as an indicator of small mammal population cycles in the boreal forest of eastern North America },
    JOURNAL = { Oikos },
    YEAR = { 2004 },
    VOLUME = { 107 },
    PAGES = { 190-198 },
    NUMBER = { 1 },
    NOTE = { 00301299 (ISSN) Cited By (since 1996): 1 Export Date: 25 April 2007 Source: Scopus CODEN: OIKSA doi: 10.1111/j.0030-1299.2004.13285.x Language of Original Document: English References: Andersson, M., Nomadism and site tenacity as alternative reproductive tactics in birds (1980) J. Anim. Ecol., 49, pp. 175-184; Ansseau, C., Be?langer, L., Bergeron, J.-F., E?cologie forestie?re (1996) Ordre des Inge?nieurs Forestiers du Que?bec, Manuel de Foresterie, pp. 133-279. , Les Presses de l'Univ. Laval; Banfield, A.W.F., (1977) Les Mammife?res du Canada, , Univ. of Toronto Press; Bondrup-Nielsen, S., (1978) Vocalizations, Nesting and Habitat Preferences of the Boreal Owl (Aegolius Funereus) in North America, , M.Sc. Thesis, Univ. of Toronto, Canada; Boos, J.D., Watt, W.R., (1997) Small Mammal Habitat Associations in the Lake Abitibi Model Forest of Northeastern Ontario, , Ontario Min. of Nat. Res., Northeast Science and Technology. 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    ABSTRACT = { Contrary to what is observed in Fennoscandia, it seems to be widely accepted that small mammals do not exhibit multi-annual population cycles in the boreal forest of North America. However, in the last thirty years, irruptions of vole predators such as owls have been reported by ornithologists south of the North American boreal forest. While such southerly irruptions have been associated in Fennoscandia with periods of low abundance of small mammals within their usual distribution range, their possible cyclic nature and their relationships to fluctuations in vole densities at northern latitudes has not yet been demonstrated in North America. With information collected from existing data-bases, we examined the presence of cycles in small mammals and their main avian predators by using temporal autocorrelation analyses. Winter invasions of boreal owls (Aegolius funereus) were periodic, with a 4-yr cycle in Que?bec. Populations of one species of small mammal, the red-backed vole (Clethrionomys gapperi), fluctuated periodically in boreal forests of Que?bec (north to 48°N). Boreal owls show invasion cycles which correspond to years of low density of red-backed voles, the main food item for this owl species. In addition, winter observations of northern hawk owls (Surnia ulula) and great gray owls (Strix nebulosa) south of their usual range increased in years of low density of red-backed voles. Our results suggest that a 4-yr population cycle exists in the eastern boreal forest of North America for voles and owls, which is very similar to the one observed in Fennoscandia. },
    KEYWORDS = { bioindicator boreal forest population cycle population dynamics raptor small mammal winter North America Accipitrinae Aegolius Aegolius funereus Aves Clethrionomys Clethrionomys gapperi Galliformes Mammalia Muridae Raptores Strigiformes Strix Strix nebulosa Surnia ulula },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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