气候变化领域集成服务门户(CCPortal): Opportunistic behaviour after the Toarcian Oceanic Anoxic Event: The trace fossil Halimedides

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DOI	10.1016/j.palaeo.2019.01.036
	Opportunistic behaviour after the Toarcian Oceanic Anoxic Event: The trace fossil Halimedides
	Rodríguez-Tovar F.J.; Miguez-Salas O.; Dorador J.; Duarte L.V.
发表日期	2019
ISSN	0031-0182
起始页码	240
结束页码	250
卷号	520
英文摘要	We present an analysis of the first well-documented record of the trace fossil Halimedides in Lower Jurassic (Toarcian) sediments, from the West Iberian Palaeomargin (Lusitanian Basin, Portugal). The abundant and well-preserved specimens allow a detailed ichnological characterization, supporting interpretation of the associated palaeoenvironmental conditions in terms of substrate consistency (firmgrounds), food availability and ethology of tracemaker (agrichnial/sequestrichnia behaviour). The appearance of this enigmatic trace is just after the Toarcian Oceanic Anoxic Event (T-OAE), in agreement with previous records associated with oceanic anoxic events as the OAE-1 and OAE-2. However, in the case study, oxygenation at the seafloor can be discarded as the major factor inducing colonization by Halimedides tracemakers. The rapid appearance of this trace after the T-OAE is related to the opportunistic behaviour of the tracemaker. Agrichnial/sequestrichnia behaviour —capturing and storing food particles — together with efficient microbial gardening favoured rapid colonization of the comparatively oligotrophic seafloor in a transgressive context. The record of Halimedides could be appraised as a tool to evidence significant palaeoenvironmental changes such as those associated with bio-events. © 2019 Elsevier B.V.
英文关键词	Agrichnial/sequestrichnia behaviour; Ichnology; Oligotrophic seafloor; Oxygenation; Paleoenvironmental conditions; Recovery
语种	英语
scopus关键词	anoxic conditions; colonization; environmental conditions; food availability; ichnology; Jurassic; oxygenation; paleoenvironment; seafloor; Toarcian; trace fossil; transgression; type specimen; Atlantic Ocean; Lisboa [Portugal]; Lusitanian Basin; Portugal
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151017
作者单位	Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Fuentenueva s/n Universidad de Granada, Granada, 18002, Spain; Department of Earth Sciences, Royal Holloway Univ. London, Egham, Surrey, TW20 0EX, United Kingdom; MARE, Departamento de Ciências da Terra, Sílvio Lima s/n Universidade de Coimbra, Polo II, Coimbra, 3030-790, Portugal
推荐引用方式 GB/T 7714	Rodríguez-Tovar F.J.,Miguez-Salas O.,Dorador J.,et al. Opportunistic behaviour after the Toarcian Oceanic Anoxic Event: The trace fossil Halimedides[J],2019,520.
APA	Rodríguez-Tovar F.J.,Miguez-Salas O.,Dorador J.,&Duarte L.V..(2019).Opportunistic behaviour after the Toarcian Oceanic Anoxic Event: The trace fossil Halimedides.Palaeogeography, Palaeoclimatology, Palaeoecology,520.
MLA	Rodríguez-Tovar F.J.,et al."Opportunistic behaviour after the Toarcian Oceanic Anoxic Event: The trace fossil Halimedides".Palaeogeography, Palaeoclimatology, Palaeoecology 520(2019).