globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13374
论文题名:
Effects of temperature variability on community structure in a natural microbial food web
作者: Zander A.; Bersier L.-F.; Gray S.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:1
起始页码: 56
结束页码: 67
语种: 英语
英文关键词: bacterial density ; food web structure ; microcosm ; protist community ; Sarracenia purpurea ; successional stage ; temperature variation
Scopus关键词: bacterium ; carnivorous plant ; community structure ; food web ; microcosm ; protist ; temperature effect ; Europe ; North America ; Bacteria (microorganisms) ; Protista ; Sarracenia purpurea
英文摘要: Climate change research has demonstrated that changing temperatures will have an effect on community-level dynamics by altering species survival rates, shifting species distributions, and ultimately, creating mismatches in community interactions. However, most of this work has focused on increasing temperature, and still little is known about how the variation in temperature extremes will affect community dynamics. We used the model aquatic community held within the leaves of the carnivorous plant, Sarracenia purpurea, to test how food web dynamics will be affected by high temperature variation. We tested the community response of the first (bacterial density), second (protist diversity and composition), and third trophic level (predator mortality), and measured community respiration. We collected early and late successional stage inquiline communities from S. purpurea from two North American and two European sites with similar average July temperature. We then created a common garden experiment in which replicates of these communities underwent either high or normal daily temperature variation, with the average temperature equal among treatments. We found an impact of temperature variation on the first two, but not on the third trophic level. For bacteria in the high-variation treatment, density experienced an initial boost in growth but then decreased quickly through time. For protists in the high-variation treatment, alpha-diversity decreased faster than in the normal-variation treatment, beta-diversity increased only in the European sites, and protist community composition tended to diverge more in the late successional stage. The mortality of the predatory mosquito larvae was unaffected by temperature variation. Community respiration was lower in the high-variation treatment, indicating a lower ecosystem functioning. Our results highlight clear impacts of temperature variation. A more mechanistic understanding of the effects that temperature, and especially temperature variation, will have on community dynamics is still greatly needed. © 2016 John Wiley & Sons Ltd
资助项目: We would like to warmly thank Dominique Gravel for the use of his laboratory at the University of Québec in Rimouski. We also thank Steve Vissault, Renaud McKinnon, Timothée Poisot, Génika Hulliger, Marie-Amélie Girardet, and Elodie Parain for aiding in marking leaves, collecting samples, and in laboratory preparation. Funding sources for this project are the Swiss National Science Foundation (SNSF) Grant awarded to LFB (31003A_138489) and the SNSF International Short Visit Grant awarded to SMG.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61203
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biology – Ecology and Evolution, University of Fribourg, Chemin du Musée 10, Fribourg, Switzerland

Recommended Citation:
Zander A.,Bersier L.-F.,Gray S.M.. Effects of temperature variability on community structure in a natural microbial food web[J]. Global Change Biology,2017-01-01,23(1)
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