Comment on ‘<i>Wetzeliella</i> and its allies – the ‘hole’ story: a taxonomic revision of the Paleogene dinoflagellate subfamily Wetzelielloideae’ by Williams et al. (2015)

Bijl, Peter K.; Brinkhuis, Henk; Egger, Lisa M.; Eldrett, James S; Frieling, Joost; Grothe, Arjen; Houben, Alexander J. P.; Pross, Jörg; Śliwińska, Kasia K.; Sluijs, Appy

doi:10.1080/01916122.2016.1235056

Cited by 30 publications

(39 citation statements)

References 21 publications

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“…Recent taxonomic revision of several taxa has removed Apectodinium augustum from Apectodinium and moved it to Axiodinium . However, we follow the comment of Bijl et al (2016) and retain A. augustum within the genus of Apectodinium. We consider species within Apectodinium to have similar affinities and continue to refer to the quasi-global abundance event as the Apectodinium acme.…”

Section: The Onset Of the Petm And The Apectodinium Acmementioning

confidence: 99%

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

et al. 2018

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Abstract. The Paleocene-Eocene Thermal Maximum (PETM, 56 Ma) was a phase of rapid global warming associated with massive carbon input into the ocean-atmosphere system from a 13 C-depleted reservoir. Many midlatitude and high-latitude sections have been studied and document changes in salinity, hydrology and sedimentation, deoxygenation, biotic overturning, and migrations, but detailed records from tropical regions are lacking. Here, we study the PETM at Ocean Drilling Program (ODP) Site 959 in the equatorial Atlantic using a range of organic and inorganic proxies and couple these with dinoflagellate cyst (dinocyst) assemblage analysis. The PETM at Site 959 was previously found to be marked by a ∼ 3.8 ‰ negative carbon isotope excursion (CIE) and a ∼ 4 • C surface ocean warming from the uppermost Paleocene to peak PETM, of which ∼ 1 • C occurs before the onset of the CIE. We record upper Paleocene dinocyst assemblages that are similar to PETM assemblages as found in extratropical regions, confirming poleward migrations of ecosystems during the PETM. The early stages of the PETM are marked by a typical acme of the tropical genus Apectodinium, which reaches abundances of up to 95 %. Subsequently, dinocyst abundances diminish greatly, as do carbonate and pyritized silicate microfossils. The combined paleoenvironmental information from Site 959 and a close-by shelf site in Nigeria implies the general absence of eukaryotic surface-dwelling microplankton during peak PETM warmth in the eastern equatorial Atlantic, most likely caused by heat stress. We hypothesize, based on a literature survey, that heat stress might have reduced calcification in more tropical regions, potentially contributing to reduced deep sea carbonate accumulation rates, and, by buffering acidification, also to biological carbonate compensation of the injected carbon during the PETM. Crucially, abundant organic benthic foraminiferal linings imply sustained export production, likely driven by prokaryotes. In sharp contrast, the recovery of the CIE yields rapid ( 10 kyr) fluctuations in the abundance of several dinocyst groups, suggesting extreme ecosystem and environmental variability.

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Section: The Onset Of the Petm And The Apectodinium Acmementioning

confidence: 99%

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

et al. 2018

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“…Dinoflagellate cyst taxonomy follows that cited in Williams et al (2017; available through AASP -The Palynological Society at http://www.palynology.org and as a website at http://dinoflaj.smu.ca/dinoflaj3/), with the exception of the taxonomy of the subfamily Wetzelielloideae, for which we follow Bijl et al (2016; see Table 2 for a species list). Of particular stratigraphic importance are the numerous species and morphotypes of the genus Lejeunecysta encountered, many of which have recently been formally described from Cape Roberts, Ross Sea (Clowes et al, 2016).…”

Section: Taxonomy and Nomenclaturementioning

confidence: 99%

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Bijl

Houben

Bruls

et al. 2018

J. Micropalaeontol.

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Abstract. There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene-Miocene because these time intervals experienced atmospheric CO 2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts into a temporal framework. This is at least partially due to the fact that the bioevents recorded in organic-walled dinoflagellate cysts (dinocysts), which often represent the only microfossil group preserved, have not yet been calibrated to the international timescale. Here we present dinocyst ranges from Oligocene-Miocene sediments drilled offshore the Wilkes Land continental margin, East Antarctica (Integrated Ocean Drilling Program (IODP) Hole U1356A). In addition, we apply statistical means to test a priori assumptions about whether the recorded taxa were deposited in situ or were reworked from older strata. Moreover, we describe two new dinocyst species, Selenopemphix brinkhuisii sp. nov. and Lejeunecysta adeliensis sp. nov., which are identified as important markers for regional stratigraphic analysis. Finally, we calibrate all identified dinocyst events to the international timescale using independent age control from calcareous nanoplankton and magnetostratigraphy from IODP Hole U1356A, and we propose a provisional dinoflagellate cyst zonation scheme for the Oligocene-Miocene of the Southern Ocean.

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“…All sample residues and slides are stored at the Laboratory of Palynology and Paleobotany, Utrecht University, Utrecht, the Netherlands. Dinocyst taxonomy generally follows Fensome and Williams (2004), except for Wetzelielloideae, where we follow Bijl et al (2016). Pollen and spore taxonomy follows Harris (1965), Macphail et al (1994), and Stover and Partridge (1973).…”

Section: Palynologymentioning

confidence: 99%

Identification of the Paleocene–Eocene boundary in coastal strata in the Otway Basin, Victoria, Australia

Frieling

Huurdeman

Rem

et al. 2018

J. Micropalaeontol.

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Abstract. Detailed, stratigraphically well-constrained environmental reconstructions are available for Paleocene and Eocene strata at a range of sites in the southwest Pacific Ocean (New Zealand and East Tasman Plateau; ETP) and Integrated Ocean Discovery Program (IODP) Site U1356 in the south of the Australo-Antarctic Gulf (AAG). These reconstructions have revealed a large discrepancy between temperature proxy data and climate models in this region, suggesting a crucial error in model, proxy data or both. To resolve the origin of this discrepancy, detailed reconstructions are needed from both sides of the Tasmanian Gateway. Paleocene-Eocene sedimentary archives from the west of the Tasmanian Gateway have unfortunately remained scarce (only IODP Site U1356), and no well-dated successions are available for the northern sector of the AAG. Here we present new stratigraphic data for upper Paleocene and lower Eocene strata from the Otway Basin, southeast Australia, on the (north)west side of the Tasmanian Gateway. We analyzed sediments recovered from exploration drilling (Latrobe-1 drill core) and outcrop sampling (Point Margaret) and performed high-resolution carbon isotope geochemistry of bulk organic matter and dinoflagellate cyst (dinocyst) and pollen biostratigraphy on sediments from the regional lithostratigraphic units, including the Pebble Point Formation, Pember Mudstone and Dilwyn Formation. Pollen and dinocyst assemblages are assigned to previously established Australian pollen and dinocyst zonations and tied to available zonations for the SW Pacific. Based on our dinocyst stratigraphy and previously published planktic foraminifer biostratigraphy, the Pebble Point Formation at Point Margaret is dated to the latest Paleocene. The globally synchronous negative carbon isotope excursion that marks the Paleocene-Eocene boundary is identified within the top part of the Pember Mudstone in the Latrobe-1 borehole and at Point Margaret. However, the high abundances of the dinocyst Apectodinium prior to this negative carbon isotope excursion prohibit a direct correlation of this regional bio-event with the quasi-global Apectodinium acme at the PaleoceneEocene Thermal Maximum (PETM; 56 Ma). Therefore, the first occurrence of the pollen species Spinizonocolpites prominatus and the dinocyst species Florentinia reichartii are here designated as regional markers for the PETM. In the Latrobe-1 drill core, dinocyst biostratigraphy further indicates that the early Eocene (∼ 56-51 Ma) sediments are truncated by a ∼ 10 Myr long hiatus overlain by middle Eocene (∼ 40 Ma) strata. These sedimentary archives from southeast Australia may prove key in resolving the model-data discrepancy in this region, and the new stratigraphic data presented here allow for detailed comparisons between paleoclimate records on both sides of the Tasmanian Gateway.

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Comment on ‘Wetzeliella and its allies – the ‘hole’ story: a taxonomic revision of the Paleogene dinoflagellate subfamily Wetzelielloideae’ by Williams et al. (2015)

Cited by 30 publications

References 21 publications

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Identification of the Paleocene–Eocene boundary in coastal strata in the Otway Basin, Victoria, Australia

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