globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1708436115
论文题名:
Aridity weakens population-level effects of multiple species interactions on Hibiscus meyeri
作者: Louthan A.M.; Pringle R.M.; Goheen J.R.; Palmer T.M.; Morris W.F.; Doak D.F.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:3
起始页码: 543
结束页码: 548
语种: 英语
英文关键词: Abiotic stress ; Climate change ; Population growth ; Range boundaries ; Species interactions
Scopus关键词: herbaceous agent ; abiotic stress ; Article ; climate change ; competition ; desert ; environment ; herbivory ; Hibiscus ; Hibiscus meyeri ; hypothesis ; nonhuman ; organismal interaction ; pollination ; population growth ; precipitation ; priority journal ; shrub ; temperature ; Africa ; animal ; chemistry ; desert climate ; ecosystem ; growth, development and aging ; Hibiscus ; kinetics ; physiology ; Africa ; Animals ; Climate Change ; Desert Climate ; Ecosystem ; Herbivory ; Hibiscus ; Kinetics
英文摘要: Predicting howspecies' abundances and rangeswill shift in response to climate change requires a mechanistic understanding of how multiple factors interact to limit population growth. Both abiotic stress and species interactions can limit populations and potentially set range boundaries, but we have a poor understanding of when and where each is most critical. A commonly cited hypothesis, first proposed by Darwin, posits that abiotic factors (e.g., temperature, precipitation) are stronger determinants of range boundaries in apparently abiotically stressful areas ("stress" indicates abiotic factors that reduce population growth), including desert, polar, or highelevation environments, whereas species interactions (e.g., herbivory, competition) play a stronger role in apparently less stressful environments. We tested a core tenet of this hypothesis-that population growth rate is more strongly affected by species interactions in less stressful areas-using experimental manipulations of species interactions affecting a common herbaceous plant, Hibiscus meyeri (Malvaceae), across an aridity gradient in a semiarid African savanna. Population growth was more strongly affected by four distinct species interactions (competition with herbaceous and shrubby neighbors, herbivory, and pollination) in less stressful mesic areas than in more stressful arid sites. However, contrary to common assumptions, this effect did not arise because of greater density or diversity of interacting species in less stressful areas, but rather because aridity reduced sensitivity of population growth to these interactions. Our work supports classic predictions about the relative strength of factors regulating population growth across stress gradients, but suggests that this pattern results from a previously unappreciated mechanism that may apply to many species worldwide. © 2018 National Academy of Sciences.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163748
Appears in Collections:气候变化与战略

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作者单位: Louthan, A.M., Department of Biology, Duke University, Durham, NC 27708, United States, Mpala Research Centre, Nanyuki, 10400, Kenya, Environmental Studies Program, University of Colorado, Boulder, CO 80309, United States; Pringle, R.M., Mpala Research Centre, Nanyuki, 10400, Kenya, Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Goheen, J.R., Mpala Research Centre, Nanyuki, 10400, Kenya, Program in Ecology, Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, United States; Palmer, T.M., Mpala Research Centre, Nanyuki, 10400, Kenya, Department of Biology, University of Florida, Gainesville, FL 32611, United States; Morris, W.F., Department of Biology, Duke University, Durham, NC 27708, United States; Doak, D.F., Mpala Research Centre, Nanyuki, 10400, Kenya, Environmental Studies Program, University of Colorado, Boulder, CO 80309, United States

Recommended Citation:
Louthan A.M.,Pringle R.M.,Goheen J.R.,et al. Aridity weakens population-level effects of multiple species interactions on Hibiscus meyeri[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(3)
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