DOI: 10.1038/ngeo2227
论文题名: Resilience of Pacific pelagic fish across the Cretaceous/Palaeogene mass extinction
作者: Sibert E.C. ; Hull P.M. ; Norris R.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 9 起始页码: 667
结束页码: 670
语种: 英语
英文摘要: Open-ocean ecosystems experienced profound disruptions to biodiversity and ecological structure during the Cretaceous/Palaeogene mass extinction about 66 million years ago. It has been suggested that during this mass extinction, a collapse of phytoplankton production rippled up the food chain, causing the wholesale loss of consumers and top predators. Pelagic fish represent a key trophic link between primary producers and top predators, and changes in their abundance provide a means to examine trophic relationships during extinctions. Here we analyse accumulation rates of microscopic fish teeth and shark dermal scales (ichthyoliths) in sediments from the Pacific Ocean and Tethys Sea across the Cretaceous/Palaeogene extinction to reconstruct fish abundance. We find geographic differences in post-disaster ecosystems. In the Tethys Sea, fish abundance fell abruptly at the Cretaceous/Palaeogene boundary and remained depressed for at least 3 million years. In contrast, fish abundance in the Pacific Ocean remained at or above pre-boundary levels for at least four million years following the mass extinction, despite marked extinctions in primary producers and other zooplankton consumers in this region. We suggest that the mass extinction did not produce a uniformly dead ocean or microbially dominated system. Instead, primary production, at least regionally, supported ecosystems with mid-trophic-level abundances similar to or above those of the Late Cretaceous. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106473
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, CA 92093, United States; Department of Geology and Geophysics, Yale University, New Haven, CT 06520, United States
Recommended Citation:
Sibert E.C.,Hull P.M.,Norris R.D.. Resilience of Pacific pelagic fish across the Cretaceous/Palaeogene mass extinction[J]. Nature Geoscience,2014-01-01,7(9)