globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.11.022
论文题名:
Explaining high-diversity death assemblages: Undersampling of the living community, out-of-habitat transport, time-averaging of rare taxa, and local extinction
作者: Bürkli A.; Wilson A.B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 466
起始页码: 174
结束页码: 183
语种: 英语
英文关键词: Allochthonous species ; Benthic ecology ; Biodiversity ; Living community ; Mollusca ; Taphonomy
英文摘要: Molluscan benthic assemblages provide unique opportunities for understanding both spatial and temporal patterns of biodiversity. Species richness in the shell remains found at a site (i.e. the death assemblage) is typically several times higher than in the counterpart living assemblage, reflecting a complex history of settlement, dissemination and decomposition post-mortem. We used high-density temporal and spatial sampling (> 37000 individuals representing 196 taxa) of a shallow (5–8 m) nearshore sandy habitat off the coast of south-east Sardinia (Italy, Mediterranean Sea) to study the factors responsible for differences in the relative diversity of living and death assemblages. We found that death assemblages at all sites were considerably more diverse than living communities (1.5–3.5x more dead than living taxa after sample-size standardization), with 78% of all taxa solely recovered as empty shells, resulting in low live-dead agreement. By carefully filtering the raw data and combining them with habitat information extracted from the literature, we disentangled the major causes of this discordance and quantified their individual effects. Increased dead diversities could not be attributed to undersampling of the living community, but instead resulted from three phenomena of decreasing importance: the post-mortem, out-of-habitat transport of non-indigenous taxa (57% of dead-only taxa were allochthonous), the time-averaged presence of rare indigenous taxa (40% of dead-only taxa), and the likely local extirpation of a small number of species (3% of dead-only taxa). Our approach demonstrates how ecological inferences based on death assemblages can be improved by restricting analyses to demonstrably indigenous taxa, and highlights how mollusc shell remains can be used to provide information over both ecological and evolutionary timescales. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68014
Appears in Collections:过去全球变化的重建

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作者单位: Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, Zurich, Switzerland; Department of Aquatic Ecology, EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, Dübendorf, Switzerland; Institute of Integrative Biology, ETH Zurich, Universitätsstrasse 16, Zurich, Switzerland; Department of Biology, Brooklyn College, 2900 Bedford Avenue, Brooklyn, NY, United States; The Graduate Center, City University of New York, 365 Fifth Avenue, New York, NY, United States

Recommended Citation:
Bürkli A.,Wilson A.B.. Explaining high-diversity death assemblages: Undersampling of the living community, out-of-habitat transport, time-averaging of rare taxa, and local extinction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,466
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