气候变化领域集成服务门户(CCPortal): Morphometric response of late Aptian planktonic foraminiferal communities to environmental changes: A case study of Paraticinella rohri at Poggio le Guaine (central Italy)

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DOI	10.1016/j.palaeo.2019.109384
	Morphometric response of late Aptian planktonic foraminiferal communities to environmental changes: A case study of Paraticinella rohri at Poggio le Guaine (central Italy)
	Ferraro S.; Coccioni R.; Sabatino N.; Del Core M.; Sprovieri M.
发表日期	2020
ISSN	0031-0182
卷号	538
英文摘要	The Aptian-Albian boundary interval represents a pivotal time of pronounced climate/ocean changes associated with Oceanic Anoxic Event 1b (OAE 1b) that seriously influenced marine pelagic ecosystems. The sedimentary successions record the first and most significant species turnover in the evolutionary history of planktonic foraminifera, consisting of the selective extinction/disappearance of large Aptian species and resulting in inter-specific size reduction (the post-extinction dwarfing as in the Lilliput effect) in the earliest Albian assemblages. In this study we investigate how the planktonic foraminifera respond to crucial environmental stress and if any intra-specific decrease in test size predate the extinction (pre-extinction dwarfing). Paraticinella rohri was chosen as the most representative of the Aptian planktonic foraminiferal taxa and its test-size evolution was compared with the high-resolution record of redox and productivity geochemical proxies through the uppermost Aptian - lowermost Albian pelagic succession of Poggio le Guaine (central Italy). Our geochemical data document long-term fluctuations characteristic of a system with transitions among different states (oligotrophic-mesotrophic-eutrophic and oxic-dysoxic-anoxic). The strong correlation of the large test-size changes of Pa. rohri during its total range with higher productivity (increased Baexcess concentrations) suggests that the trophic regime was the key factor controlling robust abundance and size variability in this taxon. The progressive increase in surface water fertility during the late Aptian offered optimum ecological conditions for planktonic foraminifera, that increased in abundance, size, and specific diversity. After the transient anoxic 113/Jacob sub-event, smaller to dwarfed specimens of Pa. rohri and depauperate planktonic foraminifera assemblages faced high selective pressures due to more oligotrophic conditions. Transition to a more eutrophic ocean in the latest Aptian irreversibly eroded their resilience, and Aptian dwarfed k-strategist taxa became extinct. The planktonic foraminifera turnover has been therefore the result of an irreversible and drastic regime shift toward a more eutrophic ecosystem that promoted the thriving of small-sized opportunistic/disaster planktonic foraminiferal species and the siliceous radiolaria. © 2019 Elsevier B.V.
英文关键词	Biotic stress; Dwarfism; Productivity; Redox conditions; Size reduction
语种	英语
scopus关键词	abundance; anoxic conditions; Aptian; climate variation; community structure; environmental stress; extinction; extinction risk; morphometry; pelagic environment; productivity; proxy climate record; redox conditions; surface water; Italy; Foraminifera
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/150676
作者单位	Istituto per Lo Studio Degli Impatti Antropici e Sostenibilità in Ambiente Marino, Consiglio Nazionale Delle Ricerche (IAS-CNR), Capo Granitola, Via Del Mare 3, Campobello di MazaraTp 91021, Italy; Dipartimento di Scienze Pure e Applicate, Università Degli Studi Carlo Bo, Campo Scientifico “E. Mattei”, Località Ca’ le Suore 2, Urbino, 61029, Italy
推荐引用方式 GB/T 7714	Ferraro S.,Coccioni R.,Sabatino N.,et al. Morphometric response of late Aptian planktonic foraminiferal communities to environmental changes: A case study of Paraticinella rohri at Poggio le Guaine (central Italy)[J],2020,538.
APA	Ferraro S.,Coccioni R.,Sabatino N.,Del Core M.,&Sprovieri M..(2020).Morphometric response of late Aptian planktonic foraminiferal communities to environmental changes: A case study of Paraticinella rohri at Poggio le Guaine (central Italy).Palaeogeography, Palaeoclimatology, Palaeoecology,538.
MLA	Ferraro S.,et al."Morphometric response of late Aptian planktonic foraminiferal communities to environmental changes: A case study of Paraticinella rohri at Poggio le Guaine (central Italy)".Palaeogeography, Palaeoclimatology, Palaeoecology 538(2020).