scholarly journals Carnian (Late Triassic) C-isotope excursions, environmental changes, and biotic turnover: a global perturbation of the Earth's surface system

2018 ◽  
Vol 176 (1) ◽  
pp. 129-131 ◽  
Author(s):  
Jacopo Dal Corso ◽  
Alastair Ruffell ◽  
Nereo Preto
Keyword(s):  
Environmental Changes ◽  
Late Triassic ◽  
Surface System

scholarly journals Extinction and dawn of the modern world in the Carnian (Late Triassic)

2020 ◽  
Vol 6 (38) ◽  
pp. eaba0099 ◽  
Author(s):  
Jacopo Dal Corso ◽  
Massimo Bernardi ◽  
Yadong Sun ◽  
Haijun Song ◽  
Leyla J. Seyfullah ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Meta Analysis ◽  
Substantial Reduction ◽  
Terrestrial Ecosystems ◽  
Late Triassic ◽  
Modern World ◽  
Calcareous Nannofossils ◽  
Global Environmental ◽  
Fossil Data ◽  
Global Environmental Changes

The Carnian Pluvial Episode (Late Triassic) was a time of global environmental changes and possibly substantial coeval volcanism. The extent of the biological turnover in marine and terrestrial ecosystems is not well understood. Here, we present a meta-analysis of fossil data that suggests a substantial reduction in generic and species richness and the disappearance of 33% of marine genera. This crisis triggered major radiations. In the sea, the rise of the first scleractinian reefs and rock-forming calcareous nannofossils points to substantial changes in ocean chemistry. On land, there were major diversifications and originations of conifers, insects, dinosaurs, crocodiles, lizards, turtles, and mammals. Although there is uncertainty on the precise age of some of the recorded biological changes, these observations indicate that the Carnian Pluvial Episode was linked to a major extinction event and might have been the trigger of the spectacular radiation of many key groups that dominate modern ecosystems.

Background Earth system state amplified Carnian (Late Triassic) environmental changes

2022 ◽  
Vol 578 ◽  
pp. 117321
Author(s):  
Jacopo Dal Corso ◽  
Benjamin J.W. Mills ◽  
Daoliang Chu ◽  
Robert J. Newton ◽  
Haijun Song
Keyword(s):  
Environmental Changes ◽  
Late Triassic ◽  
System State ◽  
Earth System

scholarly journals Integrated Sr isotope variations and global environmental changes through the Late Permian to early Late Triassic

2015 ◽  
Vol 424 ◽  
pp. 140-147 ◽  
Author(s):  
Haijun Song ◽  
Paul B. Wignall ◽  
Jinnan Tong ◽  
Huyue Song ◽  
Jing Chen ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Late Triassic ◽  
Late Permian ◽  
Sr Isotope ◽  
Global Environmental ◽  
Global Environmental Changes ◽  
Early Late

scholarly journals Biotic and environmental changes in the Panthalassa Ocean across the Norian (Late Triassic) impact event

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Honami Sato ◽  
Yutaro Takaya ◽  
Kazutaka Yasukawa ◽  
Koichiro Fujinaga ◽  
Tetsuji Onoue ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Environmental Changes ◽  
Upper Triassic ◽  
Late Triassic ◽  
Time Interval ◽  
Impact Event ◽  
Central Japan ◽  
Burial Flux ◽  
Bedded Chert ◽  
The Impact

Abstract Stratigraphic records of impact ejecta preserved in a pelagic deep-sea setting occur within Upper Triassic successions of the subduction-generated accretionary complexes of central Japan. A significant biotic turnover in radiolarians occurred during the ~ 300 kyr time interval after the impact event, which is characterized by a remarkable reduction in the burial flux of radiolarian silica. However, the nature of the environmental conditions at this time remains unclear. To investigate the environmental changes that triggered a decline in radiolarian burial flux after the impact event, geochemical proxies (major, trace, and rare earth elements) were applied to the middle–upper Norian (Upper Triassic) bedded chert succession of the Mino Belt, central Japan. A progressive environmental deterioration is evident from (1) a post-impact shutdown of burial flux of primary and silica- and apatite-secreting organisms; and (2) a subsequent abrupt increase in chemical weathering associated with a sustained reduction in the burial flux of radiolarian silica. No significant redox changes were observed across the impact event. The continental weathering proxies suggest a transient increase in weathering intensity occurred during the decline of radiolarian burial flux, likely in response to a short-term warm and humid period. Our results delineate a remarkable record of progressive environmental changes in the Panthalassa Ocean after this large impact event.

Linking transcription, RNA polymerase II elongation and alternative splicing

2020 ◽  
Vol 477 (16) ◽  
pp. 3091-3104 ◽  
Author(s):  
Luciana E. Giono ◽  
Alberto R. Kornblihtt
Keyword(s):  
Gene Expression ◽  
Alternative Splicing ◽  
Rna Polymerase Ii ◽  
Environmental Changes ◽  
Transcription Elongation ◽  
Single Gene ◽  
Regulation Of Gene Expression ◽  
Regulation Of Transcription ◽  
Stepping Stones ◽  
Eukaryotic Transcription

Gene expression is an intricately regulated process that is at the basis of cell differentiation, the maintenance of cell identity and the cellular responses to environmental changes. Alternative splicing, the process by which multiple functionally distinct transcripts are generated from a single gene, is one of the main mechanisms that contribute to expand the coding capacity of genomes and help explain the level of complexity achieved by higher organisms. Eukaryotic transcription is subject to multiple layers of regulation both intrinsic — such as promoter structure — and dynamic, allowing the cell to respond to internal and external signals. Similarly, alternative splicing choices are affected by all of these aspects, mainly through the regulation of transcription elongation, making it a regulatory knob on a par with the regulation of gene expression levels. This review aims to recapitulate some of the history and stepping-stones that led to the paradigms held today about transcription and splicing regulation, with major focus on transcription elongation and its effect on alternative splicing.

Seeking to uncover biology's chemical roots

2019 ◽  
Vol 3 (5) ◽  
pp. 435-443 ◽  
Author(s):  
Addy Pross
Keyword(s):  
Environmental Changes ◽  
Biological Systems ◽  
Significant Development ◽  
The Road ◽  
Physical Chemical ◽  
Systems Chemistry ◽  
Biological World ◽  
Inanimate Matter ◽  
The Origin Of Life ◽  
Opening Up

Despite the considerable advances in molecular biology over the past several decades, the nature of the physical–chemical process by which inanimate matter become transformed into simplest life remains elusive. In this review, we describe recent advances in a relatively new area of chemistry, systems chemistry, which attempts to uncover the physical–chemical principles underlying that remarkable transformation. A significant development has been the discovery that within the space of chemical potentiality there exists a largely unexplored kinetic domain which could be termed dynamic kinetic chemistry. Our analysis suggests that all biological systems and associated sub-systems belong to this distinct domain, thereby facilitating the placement of biological systems within a coherent physical/chemical framework. That discovery offers new insights into the origin of life process, as well as opening the door toward the preparation of active materials able to self-heal, adapt to environmental changes, even communicate, mimicking what transpires routinely in the biological world. The road to simplest proto-life appears to be opening up.

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