Deep-sea benthic foraminiferal turnover across early Eocene hyperthermal events at Northeast Atlantic DSDP Site 550

Arreguín-Rodríguez, Gabriela J.; Alegret, Laia

doi:10.1016/j.palaeo.2016.03.010

Cited by 21 publications

(19 citation statements)

References 63 publications

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“…micrus , and observed a depressed spiral suture that delimits a circular protuberance formed by a small edge-like extension at the base of the chambers. This feature is more clearly seen in the holotype, but difficult to observe in one of the paratypes, and it was not observed in the specimens identified by Arreguín-Rodríguez and Alegret [ 63 ] at Site 550.…”

Section: Resultsmentioning

confidence: 81%

“…In addition, we found that many specimens assigned to P . jarvisi in Arreguín-Rodríguez and Alegret [ 63 ], and Pullenia sp. 1 in Alegret and Thomas [ 148 ] do not belong in the genus Pullenia , because they are not truly planispiral, but should be assigned to Clinapertina subplanispira .…”

Section: Resultsmentioning

confidence: 99%

“…spissiformis in Eocene material (e.g., [ 155 ]). Due to the strong similarity between these two species, Arreguín-Rodríguez and Alegret [ 63 ] called their specimens from Site 550 Anomalinoides ammonoides/spissiformis ( Fig 4.8 and 4.9 ). We suggest that these species may be synonyms, with the name A .…”

Section: Resultsmentioning

confidence: 99%

“…This turnover was synchronous with the start of the Paleocene-Eocene Thermal Maximum (PETM; e.g., [ 34 , 44 – 46 ]), the most extreme hyperthermal event punctuating the long-term global warming trend of the early Paleogene (e.g., [ 16 , 47 – 52 ]). Lower amplitude early Eocene hyperthermals have been described and evaluated from a sedimentological, isotopic and orbital-forcing perspective (e.g., [ 51 , 53 – 59 ]), but benthic foraminiferal analyses are scarce [ 43 , 60 – 63 ].…”

Section: Introductionmentioning

confidence: 99%

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Early Eocene deep-sea benthic foraminiferal faunas: Recovery from the Paleocene Eocene Thermal Maximum extinction in a greenhouse world

et al. 2018

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The early Eocene greenhouse world was marked by multiple transient hyperthermal events. The most extreme was the Paleocene-Eocene Thermal Maximum (PETM, ~56 Ma), linked to the extinction of the globally recognised deep-sea benthic foraminiferal Velasco fauna, which led to the development of early Eocene assemblages. This turnover has been studied at high resolution, but faunal development into the later early Eocene is poorly documented. There is no widely accepted early Eocene equivalent of the Late Cretaceous-Paleocene Velasco fauna, mainly due to the use of different taxonomic concepts. We compiled Ypresian benthic foraminiferal data from 17 middle bathyal-lower abyssal ocean drilling sites in the Pacific, Atlantic and Indian Oceans, in order to characterise early Eocene deep-sea faunas by comparing assemblages across space, paleodepth and time. Nuttallides truempyi, Oridorsalis umbonatus, Bulimina trinitatensis, the Bulimina simplex group, the Anomalinoides spissiformis group, pleurostomellids, uniserial lagenids, stilostomellids and lenticulinids were ubiquitous during the early Eocene (lower-middle Ypresian). Aragonia aragonensis, the Globocassidulina subglobosa group, the Cibicidoides eocaenus group and polymorphinids became ubiquitous during the middle Ypresian. The most abundant early Ypresian taxa were tolerant to stressed or disturbed environments, either by opportunistic behavior (Quadrimorphina profunda, Tappanina selmensis, Siphogenerinoides brevispinosa) and/or the ability to calcify in carbonate-corrosive waters (N. truempyi). Nuttallides truempyi, T. selmensis and other buliminids (Bolivinoides cf. decoratus group, Bulimina virginiana) were markedly abundant during the middle Ypresian. Contrary to the long-lived, highly diverse and equitable Velasco fauna, common and abundant taxa reflect highly perturbed assemblages through the earliest Ypresian, with lower diversity and equitability following the PETM extinction. In contrast, the middle Ypresian assemblages may indicate a recovering fauna, though to some extent persistently disturbed by the lower-amplitude Eocene hyperthermals (e.g., Eocene Thermal Maximum 2 and 3). We propose the name ‘Walvis Ridge fauna’ for future reference to these Ypresian deep-sea benthic foraminiferal assemblages.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Eocene deep-sea benthic foraminiferal faunas: Recovery from the Paleocene Eocene Thermal Maximum extinction in a greenhouse world

et al. 2018

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“…The recorded decline in BFAR, linked to a decline in the organic flux to the sea floor, has been explained by enhanced metabolic rates of heterotrophs (namely benthic and planktonic foraminifera) due to warming. This mechanism has been suggested to occur in other early Eocene hyperthermals as well (Arreguín-Rodríguez and Alegret, 2016). Increased remineralization of organic matter in the water column, which occurs at higher temperatures, can also be a cause of the decline in benthic and planktonic foraminiferal rates.…”

Section: Productivity and Oxygenmentioning

confidence: 92%

X Conferencias y Seminarios del Doctorado en Geología

2018

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Ordination analysis in sedimentology, geochemistry and palaeoenvironment—Background, current trends and recommendations

Bialik

Jarochowska

Grossowicz

2021

The Depositional Record

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Ordination is the name given to a group of methods used to analyse multiple variables without preceding hypotheses. Over the last few decades, the use of these methods in Earth science in general, and notably in analyses of sedimentary sources, has dramatically increased. However, with limited resources oriented towards Earth scientists on the topic, the application of ordination analysis is at times suboptimal and misuse by authors can occur. This text was written for researchers with little to no experience with ordination with the aim of exposing them to the utility and the pitfalls of this branch of exploratory statistics. To do so, a detailed review of three ordination methods is offered: principal component analysis, non‐metric multidimensional scaling and detrended correspondence analysis. A survey of 163 publications in Earth science is presented, in which these ordination methods were used together with a summary of how, why and on what type of data ordination was used. With common mistakes outlined and misuses in those publications identified. Notably, issues were found with reproducibility, documentation, data set dimensions and transformations. Based on this survey, a recommended workflow is offered for Earth scientists who wish to apply ordination. Additionally, this article is accompanied by highly annotated R scripts for novice users to use these methods.

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Deep-sea benthic foraminiferal turnover across early Eocene hyperthermal events at Northeast Atlantic DSDP Site 550

Cited by 21 publications

References 63 publications

Early Eocene deep-sea benthic foraminiferal faunas: Recovery from the Paleocene Eocene Thermal Maximum extinction in a greenhouse world

Early Eocene deep-sea benthic foraminiferal faunas: Recovery from the Paleocene Eocene Thermal Maximum extinction in a greenhouse world

X Conferencias y Seminarios del Doctorado en Geología

Ordination analysis in sedimentology, geochemistry and palaeoenvironment—Background, current trends and recommendations

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