气候变化领域集成服务门户(CCPortal): Fossil dermal denticles reveal the preexploitation baseline of a Caribbean coral reef shark community

CCPortal

DOI	10.1073/pnas.2017735118
	Fossil dermal denticles reveal the preexploitation baseline of a Caribbean coral reef shark community
	Dillon E.M.; McCauley D.J.; Morales-Saldaña J.M.; Leonard N.D.; Zhao J.-X.; O’Dea A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:29
英文摘要	Preexploitation shark baselines and the history of human impact on coral reef–associated shark communities in the Caribbean are poorly understood. We recovered shark dermal denticles from mid-Holocene (∼7 ky ago) and modern reef sediments in Bocas del Toro, Caribbean Panama, to reconstruct an empirical shark baseline before major human impact and to quantify how much the modern shark community in the region had shifted from this historical reference point. We found that denticle accumulation rates, a proxy for shark abundance, declined by 71% since the mid-Holocene. All denticle morphotypes, which reflect shark community composition, experienced significant losses, but those morphotypes found on fast-swimming, pelagic sharks (e.g., families Carcharhinidae and Sphyrnidae) declined the most. An analysis of historical records suggested that the steepest decline in shark abundance occurred in the late 20th century, coinciding with the advent of a targeted shark fishery in Panama. Although the disproportionate loss of denticles characterizing pelagic sharks was consistent with overfishing, the large reduction in denticles characterizing demersal species with low commercial value (i.e., the nurse shark Ginglymostoma cirratum) indicated that other stressors could have exacerbated these declines. We demonstrate that the denticle record can reveal changes in shark communities over long ecological timescales, helping to contextualize contemporary abundances and inform shark management and ecology. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Bocas del Toro; Conservation paleobiology; Mid-Holocene; Shark; Subfossil
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238861
作者单位	Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106, United States; Smithsonian Tropical Research Institute, Balboa, Panama; Marine Science Institute, University of California, Santa Barbara, CA 93106, United States; Radiogenic Isotope Facility, School of Earth and Environmental Sciences, University of Queensland, Brisbane, QLD 4072, Australia; Department of Biological, Geological, and Environmental Sciences, University of Bologna, Bologna, 40126, Italy
推荐引用方式 GB/T 7714	Dillon E.M.,McCauley D.J.,Morales-Saldaña J.M.,et al. Fossil dermal denticles reveal the preexploitation baseline of a Caribbean coral reef shark community[J],2021,118(29).
APA	Dillon E.M.,McCauley D.J.,Morales-Saldaña J.M.,Leonard N.D.,Zhao J.-X.,&O’Dea A..(2021).Fossil dermal denticles reveal the preexploitation baseline of a Caribbean coral reef shark community.Proceedings of the National Academy of Sciences of the United States of America,118(29).
MLA	Dillon E.M.,et al."Fossil dermal denticles reveal the preexploitation baseline of a Caribbean coral reef shark community".Proceedings of the National Academy of Sciences of the United States of America 118.29(2021).