Results 31 to 40 of about 3,958,760 (345)

Persistent global marine euxinia in the early Silurian

Nature Communications, 2020
The Late Ordovician mass extinction has been attributed to extended marine anoxia. Here, the authors use a metal isotope mass balance model and find the marine anoxic event lasted over 3 million years, notably longer than the anoxic event associated with
Richard G. Stockey, Devon B. Cole, Noah J. Planavsky, David K. Loydell, Jiří Frýda, Erik A. Sperling   +5 more
doaj   +1 more source

Mid-Cenozoic climate change, extinction, and faunal turnover in Madagascar, and their bearing on the evolution of lemurs

BMC Evolutionary Biology, 2020
Background Was there a mid-Cenozoic vertebrate extinction and recovery event in Madagascar and, if so, what are its implications for the evolution of lemurs?
Laurie R. Godfrey, Karen E. Samonds, Justin W. Baldwin, Michael R. Sutherland, Jason M. Kamilar, Kristen L. Allfisher   +5 more
doaj   +1 more source

Nickel isotopes link Siberian Traps aerosol particles to the end-Permian mass extinction

Nature Communications, 2021
The end-Permian mass extinction was the most severe extinction event in the past 540 million years, and the Siberian Traps large igneous province is widely hypothesized to have been the primary trigger for the environmental catastrophe. In this study, Ni
Menghan Li, Stephen E. Grasby, Shui-Jiong Wang, Xiaolin Zhang, Laura E. Wasylenki, Yilun Xu, Mingzhao Sun, Benoit Beauchamp, Dongping Hu, Yanan Shen   +9 more
doaj   +1 more source

Global taxonomic diversity of anomodonts (tetrapoda, therapsida) and the terrestrial rock record across the Permian-Triassic boundary.

PLoS ONE, 2008
The end-Permian biotic crisis (~252.5 Ma) represents the most severe extinction event in Earth's history. This paper investigates diversity patterns in Anomodontia, an extinct group of therapsid synapsids ('mammal-like reptiles'), through time and in ...
Jörg Fröbisch
doaj   +1 more source

The fate of the homoctenids (Tentaculitoidea) during the Frasnian-Famennian mass extinction (Late Devonian) [PDF]

, 2006
The homoctenids (Tentaculitoidea) are small, conical-shelled marine animals which are amongst the most abundant and widespread of all Late Devonian fossils.
Alberti GKB, Babin C, Becker RT, Blumenstengel H, Bond DPG, Boueek B, Buggisch W, Dzik J, Farsan NM, Feist R, Fisher DW, Freyer G, Grabau AW, Hajlasz B, Hallam A, Jansen U, Klapper G, Lardeux H, Li YX, Li YX, Ludvigsen R, Lutke F, Lyashenko GP, Lyashenko GP, Lyashenko GP, Lyashenko GP, McLaren DJ, Morrow JR, Over DJ, Racki G, Racki G, Raup DM, Roemer FA, Ruchholz K, Sandberg CA, Sandberg CA, Sauerland U, Schindler E, Scotese CR, Sepkoski JJ, Sherrard K, Truyols-Massoni M, Tunnicliff SP, Walliser OH, Walliser OH, Weedon MJ, Yochelson EL, Zagora K, Zhang R   +48 more
core   +1 more source

The tree balance signature of mass extinction is erased by continued evolution in clades of constrained size with trait-dependent speciation.

PLoS ONE, 2017
The kind and duration of phylogenetic topological "signatures" left in the wake of macroevolutionary events remain poorly understood. To this end, we examined a broad range of simulated phylogenies generated using trait-biased, heritable speciation ...
Guan-Dong Yang, Paul-Michael Agapow, Gabriel Yedid   +2 more
doaj   +1 more source

Mid-Pleistocene Stilostomella extinction event off northern Chile (25ºS)

Ciencias Marinas, 2007
Usando muestras de sedimentos del testigo GeoB 3388-1 de la dorsal de Iquique, norte de Chile (25ºS), reportamos la última fecha de aparición (UFA) de siete especies del grupo extinto Stilostomella.
S Núñez-Ricardo, M Marchant, B Hayward, D Hebbeln   +3 more
doaj   +1 more source

Linking the progressive expansion of reducing conditions to a stepwise mass extinction event in the late Silurian oceans

Geology, 2019
The late Ludlow Lau Event was a severe biotic crisis in the Silurian, characterized by resurgent microbial facies and faunal turnover rates otherwise only documented during the “big five” mass extinctions.
Chelsie N. Bowman, Seth A. Young, D. Kaljo, M. Eriksson, T. Them, O. Hints, T. Martma, J. Owens   +7 more
semanticscholar   +1 more source

Echinoids from the Tesero Member (Werfen Formation) of the Dolomites (Italy): implications for extinction and survival of echinoids in the aftermath of the end-Permian mass extinction [PDF]

PeerJ, 2019
The end-Permian mass extinction (∼252 Ma) was responsible for high rates of extinction and evolutionary bottlenecks in a number of animal groups. Echinoids, or sea urchins, were no exception, and the Permian to Triassic represents one of the most ...
Jeffrey R. Thompson, Renato Posenato, David J. Bottjer, Elizabeth Petsios   +3 more
doaj   +2 more sources

Rare-event extinction on stochastic networks [PDF]

EPL (Europhysics Letters), 2014
We consider the problem of extinction processes on random networks with a given structure. For sufficiently large well-mixed populations, the process of extinction of one or more state variable components occurs in the tail of the quasi-stationary probability distribution, thereby making it a rare event.
Lindley, Brandon S., Shaw, Leah B., Schwartz, Ira B.   +2 more
openaire   +2 more sources