DOI: 10.1111/gcb.13543
论文题名: Additive impacts of experimental climate change increase risk to an ectotherm at the Arctic's edge
作者: Davenport J.M. ; Hossack B.R. ; Fishback L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 6 起始页码: 2262
结束页码: 2271
语种: 英语
英文关键词: adaptation
; amphibian
; Arctic amplification
; hydroperiod
; phenotypic plasticity
; Rana sylvatica
; Subarctic
; temporary wetlands
Scopus关键词: Amphibia
; Rana sylvatica
英文摘要: Globally, Arctic and Subarctic regions have experienced the greatest temperature increases during the last 30 years. These extreme changes have amplified threats to the freshwater ecosystems that dominate the landscape in many areas by altering water budgets. Several studies in temperate environments have examined the adaptive capacity of organisms to enhance our understanding of the potential repercussions of warming and associated accelerated drying for freshwater ecosystems. However, few experiments have examined these impacts in Arctic or Subarctic freshwater ecosystems, where the climate is changing most rapidly. To evaluate the capacity of a widespread ectotherm to anticipated environmental changes, we conducted a mesocosm experiment with wood frogs (Rana sylvatica) in the Canadian Subarctic. Three warming treatments were fully crossed with three drying treatments to simulate a range of predicted changes in wetland environments. We predicted wetland warming and drying would act synergistically, with water temperature partially compensating for some of the negative effects of accelerated drying. Across all drying regimes, a 1 °C increase in water temperature increased the odds of survival by 1.79, and tadpoles in 52-day and 64-day hydroperiod mesocosms were 4.1–4.3 times more likely to survive to metamorphosis than tadpoles in 45-day mesocosms. For individuals who survived to metamorphosis, there was only a weak negative effect of temperature on size. As expected, increased temperatures accelerated tadpole growth through day 30 of the experiment. Our results reveal that one of the dominant herbivores in Subarctic wetlands, wood frog tadpoles, are capable of increasing their developmental rates in response to increased temperature and accelerated drying, but only in an additive manner. The strong negative effects of drying on survival, combined with lack of compensation between these two environmental drivers, suggest changes in the aquatic environment that are expected in this ecosystem will reduce mean fitness of populations across the landscape. © 2016 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60922
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, Southeast Missouri State University, One University Plaza, Cape Girardeau, MO, United States; U.S. Geological Survey, Northern Rocky Mountain Science Center, Aldo Leopold Wilderness Research Institute, 790 E. Beckwith Ave., Missoula, MT, United States; Churchill Northern Studies Centre, Churchill, MB, Canada
Recommended Citation:
Davenport J.M.,Hossack B.R.,Fishback L.. Additive impacts of experimental climate change increase risk to an ectotherm at the Arctic's edge[J]. Global Change Biology,2017-01-01,23(6)