globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13435
论文题名:
Contrasting effects of summer and winter warming on body mass explain population dynamics in a food-limited Arctic herbivore
作者: Albon S.D.; Irvine R.J.; Halvorsen O.; Langvatn R.; Loe L.E.; Ropstad E.; Veiberg V.; van der Wal R.; Bjørkvoll E.M.; Duff E.I.; Hansen B.B.; Lee A.M.; Tveraa T.; Stien A.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:4
起始页码: 1374
结束页码: 1389
语种: 英语
英文关键词: climate change ; density dependence ; extreme events ; icing ; nutrition ; primary production ; Rangifer ; reindeer ; Svalbard ; weather
Scopus关键词: Embryophyta ; Rangifer ; Rangifer tarandus
英文摘要: The cumulative effects of climate warming on herbivore vital rates and population dynamics are hard to predict, given that the expected effects differ between seasons. In the Arctic, warmer summers enhance plant growth which should lead to heavier and more fertile individuals in the autumn. Conversely, warm spells in winter with rainfall (rain-on-snow) can cause ‘icing’, restricting access to forage, resulting in starvation, lower survival and fecundity. As body condition is a ‘barometer’ of energy demands relative to energy intake, we explored the causes and consequences of variation in body mass of wild female Svalbard reindeer (Rangifer tarandus platyrhynchus) from 1994 to 2015, a period of marked climate warming. Late winter (April) body mass explained 88% of the between-year variation in population growth rate, because it strongly influenced reproductive loss, and hence subsequent fecundity (92%), as well as survival (94%) and recruitment (93%). Autumn (October) body mass affected ovulation rates but did not affect fecundity. April body mass showed no long-term trend (coefficient of variation, CV = 8.8%) and was higher following warm autumn (October) weather, reflecting delays in winter onset, but most strongly, and negatively, related to ‘rain-on-snow’ events. October body mass (CV = 2.5%) increased over the study due to higher plant productivity in the increasingly warm summers. Density-dependent mass change suggested competition for resources in both winter and summer but was less pronounced in recent years, despite an increasing population size. While continued climate warming is expected to increase the carrying capacity of the high Arctic tundra, it is also likely to cause more frequent icing events. Our analyses suggest that these contrasting effects may cause larger seasonal fluctuations in body mass and vital rates. Overall our findings provide an important ‘missing’ mechanistic link in the current understanding of the population biology of a keystone species in a rapidly warming Arctic. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
资助项目: Albon, S.D. ; The James Hutton InstituteUnited Kingdom ; 电子邮件: steve.albon@hutton.ac.uk
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61013
Appears in Collections:影响、适应和脆弱性

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作者单位: The James Hutton Institute, Aberdeen, United Kingdom; Natural History Museum, University of Oslo, Box 1172 Blindern, Oslo, Norway; University Courses in Svalbard (UNIS), P.O. Box 156, Longyearbyen, Norway; Norwegian Institute for Nature Research (NINA), P.O. Box 5685 Sluppen, Trondheim, Norway; Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, Aas, Norway; Norwegian University of Life Sciences, P.O. Box 8146, Oslo, Norway; Aberdeen Centre for Environmental Sustainability (ACES), School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom; Centre for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science & Technology (NTNU), Trondheim, Norway; Biomathematics & Statistics Scotland (BioSS), Aberdeen, United Kingdom; Norwegian Institute for Nature Research (NINA), Fram Centre, Tromsø, Norway; The Norwegian Environment Agency, P.O. Box 5672 Sluppen, Trondheim, Norway; Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, United Kingdom

Recommended Citation:
Albon S.D.,Irvine R.J.,Halvorsen O.,et al. Contrasting effects of summer and winter warming on body mass explain population dynamics in a food-limited Arctic herbivore[J]. Global Change Biology,2017-01-01,23(4)
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