The response of marine phytoplankton and sedimentary organic matter to the early Toarcian (Lower Jurassic) oceanic anoxic event in northern England

Palliani, Raffaella Bucefalo; Mattioli, Emanuela; Riding, James B.

doi:10.1016/s0377-8398(02)00064-6

Cited by 161 publications

(127 citation statements)

References 46 publications

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“…The change from parallel to divergent diversity trends implies a loss of coupling between benthic and pelagic communities. Peak nektonic diversity coincides with sea-level highstand (Hesselbo, 2008), restoration of marine phytoplankton populations (Bucefalo Palliani et al, 2002), and reduction in the global extent of anoxia (Pearce et al, 2008).…”

Section: Environmental and Biotic Change Through Timementioning

confidence: 98%

Environmental controls on Jurassic marine ecosystems during global warming

Danise¹,

Twitchett²,

Little³

2015

Geology

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The fossil record has the potential to provide valuable insights into species response to past climate change if paleontological data are combined with appropriate proxies of environmental change. Here we use a novel, multivariate approach that combines a suite of geochemical proxies with high-resolution quantitative macroinvertebrate fossil data to study responses to early Toarcian warming (ca. 183 Ma). We show that benthic and nektonic ecosystems became decoupled during warming and were driven by different environmental variables. Benthic turnover was mostly driven by variations in seawater dissolved oxygen concentration, whereas turnover among the nektonic cephalopods was primarily controlled by variations in weathering, nutrient runoff, and primary productivity. Although rapid warming has been invoked as the main trigger of this event, the paleotemperature proxy was a poor predictor of marine community dynamics, and abiotic factors indirectly linked to temperature were more important. Given that similar environmental changes characterize other episodes of global warming and are impacting present-day marine communities, we predict that similar ecological responses occurred during other past events and are a probable outcome of current changes.

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Section: Environmental and Biotic Change Through Timementioning

confidence: 98%

Environmental controls on Jurassic marine ecosystems during global warming

Danise¹,

Twitchett²,

Little³

2015

Geology

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“…Gocht, 1964;Davies, 1985;Prauss, 1989;Feist-Burkhardt and Wille, 1992;Riding and Thomas, 1992;Bucefalo Palliani and Riding, 2003a). Palynological aspects of the T-OAE have been discussed by Loh et al (1986), Prauss (1996), Bucefalo Palliani et al (1998Palliani et al ( , 2002, Bucefalo Palliani and Riding (1999a) and van de Schootbrugge et al (2005bvan de Schootbrugge et al ( , 2013. These studies aimed to reconstruct the palaeoenvironmental changes associated to the T-OAE using calcareous nannoplankton, dinoflagellate cysts and other organic-walled microplankton groups.…”

Section: Introductionmentioning

confidence: 99%

“…These studies aimed to reconstruct the palaeoenvironmental changes associated to the T-OAE using calcareous nannoplankton, dinoflagellate cysts and other organic-walled microplankton groups. The environmental stress that accompanied the T-OAE led to a turnover of dinoflagellate cysts (Bucefalo Palliani and Riding, 1999b;Bucefalo Palliani et al, 2002). The genera Luehndea and Umbriadinium, together with many species either became extinct or temporarily disappeared (Bucefalo Palliani andRiding, 2003a, 2003b).…”

Section: Introductionmentioning

confidence: 99%

Multiphase response of palynomorphs to the Toarcian Oceanic Anoxic Event (Early Jurassic) in the Réka Valley section, Hungary

Baranyi

Pálfy

Görög

et al. 2016

Review of Palaeobotany and Palynology

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Major palaeoenvironmental and palaeoceanographical changes occurred during the Early Jurassic Toarcian Oceanic Anoxic Event (T-OAE), due to a perturbation of the global carbon cycle and a crisis in marine ecosystems. The sequence of environmental change and regional differences during the T-OAE are not yet fully understood and organic-walled phytoplankton and other palynomorphs are well-suited, but under-utilised, in research into this event. Based on quantitative palynological analyses from a black shale-bearing succession at Réka Valley in the Mecsek Mountains of southwest Hungary, five sequential palynomorph assemblages are distinguished. These reveal major shifts in organic-walled phytoplankton communities, driven by palaeoenvironmental changes. In addition, palynofacies analysis helped to document changes in the composition of sedimentary organic matter, and to quantify the terrestrial input. Assemblage 1 is characterised by a moderately diverse phytoplankton community and high levels of terrestrial palynomorphs. Assemblage 2 records a significant peak of the euryhaline dinoflagellate cyst Nannoceratopsis. Assemblage 3 is distinguished by dominance of highly opportunistic prasinophytes and the temporary disappearance of all dinoflagellate cyst taxa. Assemblages 4 and 5 represent distinctive phases of a prolonged recovery phase with low diversity phytoplankton assemblages and intermittently high levels of terrestrially-derived palynomorphs. The successive disappearance of phytoplankton taxa and the gradual takeover by opportunistic euryhaline species at the onset of the T-OAE were related to several phenomena. These include reduced salinity in the surface waters, establishment of a stable pycnocline and deterioration of nutrient recycling, followed by oxygen deficiency throughout much of the water column. The high amount of terrestrially-derived palynodebris indicates intense runoff and freshwater input, driven by the early Toarcian warming and the enhanced hydrological cycle. Comparison with coeval European successions proves that the palaeoenvironmental changes during the T-OAE were not entirely synchronous, and local factors played a crucial role in influencing phytoplankton communities. In the Mecsek Basin, regional freshening of the surface waters and increased terrestrial input due to the proximity of the hinterland had a greater influence on phytoplankton communities compared to the open oceanic setting of the Tethys to the south.

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“…Several authors also identified Spheripollenites with algal cysts or metanotrophic bacteria due to it is difficult to differentiate them under transmitted light microscopy (Prauss et al, 1991;Bucefalo Palliani and Riding, 2000;Bucefalo-Palliani et al, 2002). However, tetrads of meiospores usually occur in Fuentelsaz as well as pseudoporate grains scarcely ornamented with Ubisch bodies which suggest a relationship with gymnosperms.…”

Section: Palaeoenvironmental Featuresmentioning

confidence: 99%