气候变化领域集成服务门户(CCPortal): On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities

CCPortal

DOI	10.1111/ele.12900
	On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities
	McCauley D.J.; Gellner G.; Martinez N.D.; Williams R.J.; Sandin S.A.; Micheli F.; Mumby P.J.; McCann K.S.
发表日期	2018
ISSN	1461023X
卷号	21 期号:3
英文摘要	Classically, biomass partitioning across trophic levels was thought to add up to a pyramidal distribution. Numerous exceptions have, however, been noted including complete pyramidal inversions. Elevated levels of biomass top-heaviness (i.e. high consumer/resource biomass ratios) have been reported from Arctic tundra communities to Brazilian phytotelmata, and in species assemblages as diverse as those dominated by sharks and ants. We highlight two major pathways for creating top-heaviness, via: (1) endogenous channels that enhance energy transfer across trophic boundaries within a community and (2) exogenous pathways that transfer energy into communities from across spatial and temporal boundaries. Consumer–resource models and allometric trophic network models combined with niche models reveal the nature of core mechanisms for promoting top-heaviness. Outputs from these models suggest that top-heavy communities can be stable, but they also reveal sources of instability. Humans are both increasing and decreasing top-heaviness in nature with ecological consequences. Current and future research on the drivers of top-heaviness can help elucidate fundamental mechanisms that shape the architecture of ecological communities and govern energy flux within and between communities. Questions emerging from the study of top-heaviness also usefully draw attention to the incompleteness and inconsistency by which ecologists often establish definitional boundaries for communities. © 2018 John Wiley & Sons Ltd/CNRS
英文关键词	Allometric trophic network; biomass; boundary; community; consumer; inverted pyramid; resource; stability; top-heavy; trophic
语种	英语
scopus关键词	allometry; ant; arctic environment; assembly rule; biomass; biomass allocation; boundary condition; community dynamics; consumer-resource interaction; ecological modeling; energy flux; mite; niche; shark; top-down control; trophic environment; trophic level; tundra; Brazil; Chondrichthyes; Formicidae; biomass; Brazil; ecology; food chain; human; prevalence; Biomass; Brazil; Ecology; Food Chain; Humans; Prevalence
来源期刊	Ecology Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/121361
作者单位	University of California Santa Barbara, Ecology, Evolution and Marine Biology & Marine Science Institute, Santa Barbara, CA 93106, United States; Colorado State University, Biology, Fort Collins, CO 80523, United States; Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States; Vibrant Data Inc., 943 Clay Street, San Francisco, CA 94108, United States; Center for Marine Biodiversity and Conservation, Scripps Institution of Oceanography, 8750 Biological Grade, La Jolla, CA 92037, United States; Hopkins Marine Station and Center for Ocean Solutions, Stanford University, Pacific Grove, CA 93950, United States; Marine Spatial Ecology Lab, School of Biological Sciences, The University of Queensland, Goddard Bldg, St Lucia, QLD 4072, Australia; University of Guelph, Integrative Biology, Guelph, ON N1G 2W1, Canada
推荐引用方式 GB/T 7714	McCauley D.J.,Gellner G.,Martinez N.D.,et al. On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities[J],2018,21(3).
APA	McCauley D.J..,Gellner G..,Martinez N.D..,Williams R.J..,Sandin S.A..,...&McCann K.S..(2018).On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities.Ecology Letters,21(3).
MLA	McCauley D.J.,et al."On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities".Ecology Letters 21.3(2018).