Results 11 to 20 of about 3,958,760 (345)

New ophthalmosaurid ichthyosaurs from the European Lower Cretaceous demonstrate extensive ichthyosaur survival across the Jurassic-Cretaceous boundary. [PDF]

open access: yesPLoS ONE, 2012
BackgroundIchthyosauria is a diverse clade of marine amniotes that spanned most of the Mesozoic. Until recently, most authors interpreted the fossil record as showing that three major extinction events affected this group during its history: one during ...
Valentin Fischer   +9 more
doaj   +9 more sources

Effect of distance, area, and climate on the frequency of introduction and extinction events on islands and archipelagos

open access: greenEcosphere, 2020
Change in community similarity (e.g., biotic homogenization) is regulated by different types of introduction and extinction events. However, the spatial patterns and potential drivers of these event types have not yet been addressed to date.
Xianping Li   +3 more
doaj   +2 more sources

Diversification events and the effects of mass extinctions on Crocodyliformes evolutionary history [PDF]

open access: goldRoyal Society Open Science, 2015
The rich fossil record of Crocodyliformes shows a much greater diversity in the past than today in terms of morphological disparity and occupation of niches.
Mario Bronzati   +2 more
doaj   +2 more sources

The terminal cretaceous extinction event

open access: yesKoers : Bulletin for Christian Scholarship, 1988
Die oorsake van massauitsterwings in die geologiese verlede bly nog 'n fassinerende onderwerp vir bespreking. Die moontlikheid van katastrofiese ekstraterrestriële oorsake word tans nog druk bespreek en wissel van supernova tot die wyd gepubliseerde ...
P.A.J. Ryke
doaj   +3 more sources

An extinction event in planktonic Foraminifera preceded by stabilizing selection. [PDF]

open access: yesPLoS ONE, 2019
Unless they adapt, populations facing persistent stress are threatened by extinction. Theoretically, populations facing stress can react by either disruption (increasing trait variation and potentially generating new traits) or stabilization (decreasing ...
Manuel F G Weinkauf   +3 more
doaj   +2 more sources

First evidence for a massive extinction event affecting bees close to the K-T boundary. [PDF]

open access: yesPLoS One, 2013
Bees and eudicot plants both arose in the mid-late Cretaceous, and their co-evolutionary relationships have often been assumed as an important element in the rise of flowering plants. Given the near-complete dependence of bees on eudicots we would expect
Rehan SM, Leys R, Schwarz MP.
europepmc   +2 more sources

Images of social support reminders, but not learned safety signals, reduce long-term fear [PDF]

open access: yesScientific Reports
Although previously considered to simply be a form of safety signals, reminders of social-support-figures have recently been shown to have a distinct combination of effects: inhibiting fear while present, like safety signals do, but also enhancing the ...
E. A. Hornstein   +3 more
doaj   +2 more sources

De-extinction and poetry [PDF]

open access: yesCambridge Prisms: Extinction
This article centres a poem concerned with the de-extinction of the thylacine (Tasmanian tiger) to make a wider claim for the importance of poetry as a distinct contribution to thinking about de-extinction.
Katrina Schlunke
doaj   +2 more sources

Genomic and fitness consequences of a near-extinction event in the northern elephant seal. [PDF]

open access: hybridNat Ecol Evol
Hoffman JI   +14 more
europepmc   +3 more sources

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