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Gradients in population fluctuations of Tengmalm's owl Aegolius funereus in Europe

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Summary

I studied the importance of geographical location, snow cover and food to the fluctuations in 30 breeding populations of Tengmalm's owl (Aegolius funereu) in Europe. Cyclicity indices were positively related both to latitude and longitude, but within Fennoscandia they were better correlated with snow cover. Population fluctuations increased northward, while food niche breadth and degree of site tenacity decreased northwards.

Microtine fluctuations become more pronounced northwards and are more synchronized, while number of alternative prey increases southwards. These factors promote instability in North European and stability in central European owl populations. Furthermore, snow conditions were more important within Fennoscandia, since this small owl cannot hunt voles protected by deep snow. Environmental predictability and diversity of available food for Tengmalm's owl increase southwards in Europe. Thus, the owl is a resident generalist predator of small mammals and birds in central Europe and adopts a partial migration strategy (males being resident and females nomadic) in South and West Finland, changing its habits to nomadic microtine specialist in areas with pronounced vole cycles (in northern Fennoscandia). These changes fit well with the recent suggestion that gradients in density variations of small rodents are related to sustainable numbers of generalist predators.

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  1. Erkki Korpimäki

    Present address: , kp. 4, SF-62200, Kauhava, Finland

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  1. Department of Zoology, University of Oulu, Linnanmaa, SF-90570, Oulu, Finland

    Erkki Korpimäki

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Korpimäki, E. Gradients in population fluctuations of Tengmalm's owl Aegolius funereus in Europe. Oecologia 69, 195–201 (1986). https://doi.org/10.1007/BF00377621

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