Rapid Resurgence of Marine Productivity After the Cretaceous-Paleogene Mass Extinction

Science ◽  
2009 ◽  
Vol 326 (5949) ◽  
pp. 129-132 ◽  
Author(s):  
J. Sepulveda ◽  
J. E. Wendler ◽  
R. E. Summons ◽  
K.-U. Hinrichs
Keyword(s):  
Mass Extinction ◽  
Marine Productivity

scholarly journals Anatomy of an extinction revealed by molecular fossils spanning OAE2

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
R. M. Forkner ◽  
J. Dahl ◽  
A. Fildani ◽  
S. M. Barbanti ◽  
I. A. Yurchenko ◽  
...  
Keyword(s):  
Mass Extinction ◽  
Cumulative Effect ◽  
Environmental Stresses ◽  
Ecological Change ◽  
Western Interior Seaway ◽  
Oceanic Anoxic Event ◽  
Greenhorn Formation ◽  
Productivity Decline ◽  
Marine Productivity ◽  
New Evidence

AbstractThe Cenomanian–Turonian mass extinction (Oceanic Anoxic Event 2-OAE2) was a period of profound ecological change that is recorded in the sedimentary record in many locations around the globe. In this study, we provide a new and detailed account of repetitive changes in water column ecology by analyzing the organic geochemical record preserved within the OAE2 section of the Greenhorn Formation, Western Interior Seaway (WIS) of North America. Results from this study provide evidence that OAE2 in the WIS was the result of the cumulative effect of reoccurring environmental stresses rather than a single massive event. During OAE2, extreme variations in biotic composition occurred erratically over periods of several thousands of years as revealed by molecular fossil (biomarker) abundances and distributions calibrated to sedimentation rates. These cycles of marine productivity decline almost certainly had follow-on effects through the ecosystem and likely contributed to the Cenomanian–Turonian mass extinction. While the causes behind organic productivity cycling are yet unproven, we postulate that they may have been linked to repeated episodes of volcanic activity. Catastrophic volcanism and related CO2 outgassing have been interpreted as main drivers for OAE2, though this study provides new evidence that repetitive, punctuated environmental stresses were also important episodes within the anatomy of OAE2. Following OAE2, these cycles of productivity decline disappeared, and the WIS returned to conditions comparable to pre-OAE2 levels.

scholarly journals Testing the limits in a greenhouse ocean: Did low nitrogen availability limit marine productivity during the end-Triassic mass extinction?

2016 ◽  
Vol 451 ◽  
pp. 138-148 ◽  
Author(s):  
Shane D. Schoepfer ◽  
Thomas J. Algeo ◽  
Peter D. Ward ◽  
Kenneth H. Williford ◽  
James W. Haggart
Keyword(s):  
Mass Extinction ◽  
Nitrogen Availability ◽  
Marine Productivity ◽  
Low Nitrogen

scholarly journals Stable Isotope Constraints on Marine Productivity Across the Cretaceous‐Paleogene Mass Extinction

2019 ◽  
Vol 34 (7) ◽  
pp. 1195-1217 ◽  
Author(s):  
Julio Sepúlveda ◽  
Laia Alegret ◽  
Ellen Thomas ◽  
Emily Haddad ◽  
Changqun Cao ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Mass Extinction ◽  
Marine Productivity

Coal-fired trigger of mass extinction

Nature ◽  
2011 ◽  
Author(s):  
Gayathri Vaidyanathan
Keyword(s):  
Mass Extinction

An Expert Ranked List of Pro-nature Conservation Behaviours for Public Use

2019 ◽  
Author(s):  
Lea Barbett ◽  
Edward Stupple ◽  
Michael Sweet ◽  
Miles Richardson
Keyword(s):  
Nature Conservation ◽  
General Population ◽  
Mass Extinction ◽  
Negative Impact ◽  
Ecological Impact ◽  
Human Action ◽  
Short Paper ◽  
The Public ◽  
The Uk ◽  
Ranked List

The planet is facing an anthropogenic mass extinction of wildlife, which will have a grave impact on the environment and humans. Widespread human action is needed to minimize the negative impact of humans on biodiversity and support the restoration of wildlife. In order to find effective ways to promote pro-nature conservation behaviours to the general population, there is a need to provide a list of behaviours which will have worthwhile ecological impact and are worth encouraging. In a novel collaboration between psychologists and ecologists, 70 experts from practical and academic conservation backgrounds were asked to review and rate 48 conservation related behaviours. According to their judgement, this short paper presents a ranked list of pro-nature conservation behaviours for the public in the UK and similar landscapes. This includes behaviours people can engage in in their homes, their gardens, on their land, and in their roles as citizens.

The K/T Boundary of Gams (Eastern Alps, Austria) and the Nature of Terminal Cretaceous Mass Extinction

2009 ◽  
Author(s):  
Andrei Grachev ◽  
H. A. Kollmann ◽  
O. A. Korchagin ◽  
D. M. Pechersky ◽  
V. A. Tsel'movich
Keyword(s):  
Mass Extinction ◽  
Eastern Alps

INTRINSIC AND EXTRINSIC ECOLOGICAL DETERMINANTS OF EXTINCTION AT THE END-TRIASSIC MASS EXTINCTION

2016 ◽  
Author(s):  
Alexander M. Dunhill ◽  
◽  
William J. Foster ◽  
James Sciberras ◽  
Richard J. Twitchett
Keyword(s):  
Mass Extinction
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