DOI: 10.1111/gcb.13553
论文题名: Testing for local adaptation and evolutionary potential along altitudinal gradients in rainforest Drosophila: beyond laboratory estimates
作者: O'Brien E.K. ; Higgie M. ; Reynolds A. ; Hoffmann A.A. ; Bridle J.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 5 起始页码: 1847
结束页码: 1860
语种: 英语
英文关键词: altitudinal gradients
; caged transplant experiments
; Drosophila
; Fitness
; genetic variance
; local adaptation
; species distributions
Scopus关键词: Drosophila birchii
英文摘要: Predicting how species will respond to the rapid climatic changes predicted this century is an urgent task. Species distribution models (SDMs) use the current relationship between environmental variation and species’ abundances to predict the effect of future environmental change on their distributions. However, two common assumptions of SDMs are likely to be violated in many cases: (i) that the relationship of environment with abundance or fitness is constant throughout a species’ range and will remain so in future and (ii) that abiotic factors (e.g. temperature, humidity) determine species’ distributions. We test these assumptions by relating field abundance of the rainforest fruit fly Drosophila birchii to ecological change across gradients that include its low and high altitudinal limits. We then test how such ecological variation affects the fitness of 35 D. birchii families transplanted in 591 cages to sites along two altitudinal gradients, to determine whether genetic variation in fitness responses could facilitate future adaptation to environmental change. Overall, field abundance was highest at cooler, high-altitude sites, and declined towards warmer, low-altitude sites. By contrast, cage fitness (productivity) increased towards warmer, lower-altitude sites, suggesting that biotic interactions (absent from cages) drive ecological limits at warmer margins. In addition, the relationship between environmental variation and abundance varied significantly among gradients, indicating divergence in ecological niche across the species’ range. However, there was no evidence for local adaptation within gradients, despite greater productivity of high-altitude than low-altitude populations when families were reared under laboratory conditions. Families also responded similarly to transplantation along gradients, providing no evidence for fitness trade-offs that would favour local adaptation. These findings highlight the importance of (i) measuring genetic variation in key traits under ecologically relevant conditions, and (ii) considering the effect of biotic interactions when predicting species’ responses to environmental change. © 2017 The Authors. Global Change Biology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60968
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 Bristol, Life Sciences Building, Bristol, United Kingdom; Milner Centre for Evolution, Department of Biology & Biochemistry, University of Bath, Claverton Down, Bath, United Kingdom; College of Science & Engineering, James Cook University, Townsville, QLD, Australia; Institute of Biodiversity, Animal Health & Comparative Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, United Kingdom; Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
Recommended Citation:
O'Brien E.K.,Higgie M.,Reynolds A.,et al. Testing for local adaptation and evolutionary potential along altitudinal gradients in rainforest Drosophila: beyond laboratory estimates[J]. Global Change Biology,2017-01-01,23(5)