Demographic effects of extreme winter weather in the barn owl.

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State: Public
Version: author
Serval ID
serval:BIB_69F2422D7011
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Demographic effects of extreme winter weather in the barn owl.
Journal
Oecologia
Author(s)
Altwegg R., Roulin A., Kestenholz M., Jenni L.
ISSN
0029-8549[print], 0029-8549[linking]
Publication state
Published
Issued date
2006
Peer-reviewed
Oui
Volume
149
Number
1
Pages
44-51
Language
english
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Extreme weather events can lead to immediate catastrophic mortality. Due to their rare occurrence, however, the long-term impacts of such events for ecological processes are unclear. We examined the effect of extreme winters on barn owl (Tyto alba) survival and reproduction in Switzerland over a 68-year period (approximately 20 generations). This long-term data set allowed us to compare events that occurred only once in several decades to more frequent events. Winter harshness explained 17 and 49% of the variance in juvenile and adult survival, respectively, and the two harshest winters were associated with major population crashes caused by simultaneous low juvenile and adult survival. These two winters increased the correlation between juvenile and adult survival from 0.63 to 0.69. Overall, survival decreased non-linearly with increasing winter harshness in adults, and linearly in juveniles. In contrast, brood size was not related to the harshness of the preceding winter. Our results thus reveal complex interactions between climate and demography. The relationship between weather and survival observed during regular years is likely to underestimate the importance of climate variation for population dynamics.
Keywords
Adaptation, Physiological/physiology, Age Factors, Animals, Cold Temperature, Demography, Models, Theoretical, Population Dynamics, Reproduction/physiology, Seasons, Strigiformes/physiology, Survival Analysis, Switzerland
Pubmed
Web of science
Create date
24/01/2008 17:42
Last modification date
20/08/2019 14:24
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