globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2008974117
论文题名:
Late lactation in small mammals is a critically sensitive window of vulnerability to elevated ambient temperature
作者: Zhao Z.-J.; Hambly C.; Shi L.-L.; Bi Z.-Q.; Cao J.; Speakman J.R.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:39
起始页码: 24352
结束页码: 24358
语种: 英语
英文关键词: Climate change ; Energetics ; Heat waves ; Lactation ; Lethal temperature
Scopus关键词: animal experiment ; article ; breeding success ; climate change ; controlled study ; Cricetulus ; environmental temperature ; female ; heat wave ; high temperature ; infanticide ; lactation ; maternal mortality ; milk production ; mouse ; nonhuman ; reproductive success ; small mammal
英文摘要: Predicted increases in global average temperature are physiologically trivial for most endotherms. However, heat waves will also increase in both frequency and severity, and these will be physiologically more important. Lactating small mammals are hypothesized to be limited by heat dissipation capacity, suggesting high temperatures may adversely impact lactation performance. We measured reproductive performance of mice and striped hamsters (Cricetulus barabensis), including milk energy output (MEO), at temperatures between 21 and 36 °C. In both species, there was a decline in MEO between 21 and 33 °C. In mice, milk production at 33 °C was only 18% of that at 21 °C. This led to reductions in pup growth by 20% but limited pup mortality (0.8%), because of a threefold increase in growth efficiency. In contrast, in hamsters, MEO at 33 °C was reduced to 78.1% of that at 21 °C, yet this led to significant pup mortality (possibly infanticide) and reduced pup growth by 12.7%. Hamster females were more able to sustain milk production as ambient temperature increased, but they and their pups were less capable of adjusting to the lower supply. In both species, exposure to 36 °C resulted in rapid catastrophic lactation failure and maternal mortality. Upper lethal temperature was lowered by 3 to 6 °C in late lactation, making it a critically sensitive window to high ambient temperatures. Our data suggest future heat wave events will impact breeding success of small rodents, but this is based on animals with a long history in captivity. More work should be performed on wild rodents to confirm these impacts. © 2020 National Academy of Sciences. All rights reserved.
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被引频次[WOS]:25   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164016
Appears in Collections:气候变化与战略

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作者单位: Zhao, Z.-J., School of Life and Environmental Sciences, Wenzhou University, Wenzhou, Zhejiang, 325035, China; Hambly, C., Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, AB39 2PN, United Kingdom; Shi, L.-L., School of Life and Environmental Sciences, Wenzhou University, Wenzhou, Zhejiang, 325035, China; Bi, Z.-Q., School of Life and Environmental Sciences, Wenzhou University, Wenzhou, Zhejiang, 325035, China; Cao, J., School of Life and Environmental Sciences, Wenzhou University, Wenzhou, Zhejiang, 325035, China; Speakman, J.R., Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, AB39 2PN, United Kingdom, State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences (CAS), Beijing, 100100, China, CAS Center of Excellence for Animal Evolution and Genetics, Kunming, 650223, China

Recommended Citation:
Zhao Z.-J.,Hambly C.,Shi L.-L.,et al. Late lactation in small mammals is a critically sensitive window of vulnerability to elevated ambient temperature[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(39)
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