DOI: 10.1111/gcb.13265
论文题名: Drought survival is a threshold function of habitat size and population density in a fish metapopulation
作者: White R.S.A. ; McHugh P.A. ; McIntosh A.R.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期: 10 起始页码: 3341
结束页码: 3348
语种: 英语
英文关键词: climate change
; disturbance
; ecological threshold
; extreme environmental events
; fish
; land-use change
; mortality
; survival
Scopus关键词: climate change
; drought
; environmental disturbance
; extreme event
; fish
; habitat quality
; land use change
; metapopulation
; mortality
; population density
; survival
; threshold
; Neochanna apoda
英文摘要: Because smaller habitats dry more frequently and severely during droughts, habitat size is likely a key driver of survival in populations during climate change and associated increased extreme drought frequency. Here, we show that survival in populations during droughts is a threshold function of habitat size driven by an interaction with population density in metapopulations of the forest pool dwelling fish, Neochanna apoda. A mark–recapture study involving 830 N. apoda individuals during a one-in-seventy-year extreme drought revealed that survival during droughts was high for populations occupying pools deeper than 139 mm, but declined steeply in shallower pools. This threshold was caused by an interaction between increasing population density and drought magnitude associated with decreasing habitat size, which acted synergistically to increase physiological stress and mortality. This confirmed two long-held hypotheses, firstly concerning the interactive role of population density and physiological stress, herein driven by habitat size, and secondly, the occurrence of drought survival thresholds. Our results demonstrate how survival in populations during droughts will depend strongly on habitat size and highlight that minimum habitat size thresholds will likely be required to maximize survival as the frequency and intensity of droughts are projected to increase as a result of global climate change. © 2016 John Wiley & Sons Ltd 资助项目: White, R.S.A.
; School of Biological Sciences, University of Canterbury, Private Bag 4800, New Zealand
; 电子邮件: richard.sa.white@gmail.com
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61280
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; Department of Watershed Sciences, Utah State University and Eco Logical Research Inc., 5210 Old Main Hill, Logan, UT, United States
Recommended Citation:
White R.S.A.,McHugh P.A.,McIntosh A.R.. Drought survival is a threshold function of habitat size and population density in a fish metapopulation[J]. Global Change Biology,2016-01-01,22(10)