DOI: 10.1111/gcb.13408
论文题名: Increased autumn rainfall disrupts predator–prey interactions in fragmented boreal forests
作者: Terraube J. ; Villers A. ; Poudré L. ; Varjonen R. ; Korpimäki E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 4 起始页码: 1361
结束页码: 1373
语种: 英语
英文关键词: body condition
; climate change
; diet shifts
; Eurasian pygmy owl
; foraging behaviour
; habitat loss
; intensive forestry practices
Scopus关键词: Aves
; Clethrionomys glareolus
; Glaucidium (Aves)
; Glaucidium passerinum
; Mammalia
; Muridae
; Passeriformes
; Picea
; Rodentia
; Strigiformes
英文摘要: There is a pressing need to understand how changing climate interacts with land-use change to affect predator–prey interactions in fragmented landscapes. This is particularly true in boreal ecosystems facing fast climate change and intensification in forestry practices. Here, we investigated the relative influence of autumn climate and habitat quality on the food-storing behaviour of a generalist predator, the pygmy owl, using a unique data set of 15 850 prey items recorded in western Finland over 12 years. Our results highlighted strong effects of autumn climate (number of days with rainfall and with temperature <0 °C) on food-store composition. Increasing frequency of days with precipitation in autumn triggered a decrease in (i) total prey biomass stored, (ii) the number of bank voles (main prey) stored, and (iii) the scaled mass index of pygmy owls. Increasing proportions of old spruce forests strengthened the functional response of owls to variations in vole abundance and were more prone to switch from main prey to alternative prey (passerine birds) depending on local climate conditions. High-quality habitat may allow pygmy owls to buffer negative effects of inclement weather and cyclic variation in vole abundance. Additionally, our results evidenced sex-specific trends in body condition, as the scaled mass index of smaller males increased while the scaled mass index of larger females decreased over the study period, probably due to sex-specific foraging strategies and energy requirements. Long-term temporal stability in local vole abundance refutes the hypothesis of climate-driven change in vole abundance and suggests that rainier autumns could reduce the vulnerability of small mammals to predation by pygmy owls. As small rodents are key prey species for many predators in northern ecosystems, our findings raise concern about the impact of global change on boreal food webs through changes in main prey vulnerability. © 2016 John Wiley & Sons Ltd 资助项目: We thank Chiara Morosinotto, Toni Laaksonen, Jorma Nurmi, Claire Cugniere, Stefan Siivonen and Ville Vasko for great help with the fieldwork. We would like to thank Dominique Fauteux and one anonymous reviewer for thoughtful comments on an earlier version of this manuscript. This project was supported by the Academy of Finland (grant nos. 123379, 136717 and 250709 to EK). The authors declare no conflict of interest.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60990
Appears in Collections: 影响、适应和脆弱性
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作者单位: Section of Ecology, Department of Biology, University of Turku, Turku, Finland; Centre d'Etudes Biologiques de Chizé, UMR7372, CNRS – Université de la Rochelle, Villiers-en-Bois, France; Parc Naturel Régional du Haut-Jura, Maison du Parc du Haut-Jura., Lajoux, France
Recommended Citation:
Terraube J.,Villers A.,Poudré L.,et al. Increased autumn rainfall disrupts predator–prey interactions in fragmented boreal forests[J]. Global Change Biology,2017-01-01,23(4)